Applications are invited for few open positions in the area of multiscale simulation of advanced alloys and nano-material based composites. Primary focus of this research is investigatation of shock and impact responses of materials. Research effort will include development of analysis and design methods toward improving material/structural behaviour using computer simulation. Interested candidates should have preferably MTech/ME degree in mechanical/civil/aerospace/material engineering discipline with good knowledge of basic finite element method, solid mechanics/material physics, and preliminary experience in finite element simulations. Exposure to computer programming with C/C++/fortran and Matlab would be advantageous. Candidates having experimental background in material/structural mechanics/nano-materials with interests in multiscale response of materials and structures are also welcome to apply.

 Interested candidates may contact Prof D Roy Mahapatra (droymahapatra@aero.iisc.ernet.in) or Vijay Kumar Sutrakar (vijay.sutrakar@gmail.com) with detailed bio-data. 

A 42 months postgraduate studentship is available in the Impact Engineering Laboratory, Department of Engineering Science for investigation of the strain rate dependent behaviour of composite materials. This is a part of a wider collaborative project with a number of academic and industrial organisations which aims to develop novel capabilities for predictive multi-scale modelling of the behaviour of composite materials subjected to explosion and collision. The student will play the central role in developing algorithms and software for numerical simulation of mechanical behaviour of investigated composite materials. This will involve a variety of numerical modelling techniques to be developed and employed to simulate the observed and quantified behaviour at different length scales and at the range of strain rates. The methodology is likely to explore finite element based as well as isogeometric and mesh-free approaches towards successful multi-scale simulations. The developed capability will be incorporated within an existing, continually developing, integrated experimental-numerical research framework.  The research student will work under the supervision of Prof Nik Petrinic and Dr Ettore Barbieri (Queen Mary University of London).

Award Value

The studentship covers University fees at the level set for UK/EU students plus provides a stipend (tax-free maintenance grant) of £16,500 p.a. for the first year, and at least this amount for a further year. The studentship covers the payment of college fees.
 

Eligibility

The project studentship is available to all applicants.

Candidate Requirements

Prospective candidates will be judged according to how well they meet the following criteria:

• Good first degree in engineering (mechanical, naval, aerospace, civil), materials science/engineering, or physics  
• MSc in Computational Mechanics (Finite Element Method, element free)
• Proven affinity to solid mechanics and materials engineering
• Excellent computing skills and strong experience with computer aided design software and programming languages (Matlab, FORTRAN, C, or C++)

Application Procedure

To apply for this studentship:

• Candidates should send a covering letter (explaining your suitability for the study, what you hope to achieve from the D.Phil. and your research and/or   professional experience to date) to studentship@eng.ox.ac.uk
• Candidates are expected to meet the Graduate Admissions criteria available at http://www.eng.ox.ac.uk/admissions/postgraduate/admissionscriteria.pdf and a full graduate application must also be made by the application deadline. Please quote Exeter as your first choice college. Further details about making a graduate application are available at http://www.admin.ox.ac.uk/postgraduate/apply
   

Please quote NP-UW3 in all correspondence to the Department and in your graduate application.

Informal enquiries may be addressed to nik.petrinic@eng.ox.ac.uk. Please note that applications sent directly to this email address will not be accepted.

Application deadline: 7 May 2013. Interviews will be held 14 - 16 May 2013

Hello everyone,

 I am using Abaqus 6.12. 

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I have problem to change
the material properties in my model. I need your help, i spend more than week
to solve this problem. please try to help me.

 I want to change the
material properties in the second step. I use the *field key words, but
i might perform a mistake that is why, it did not work. i find that the in the
second step the young's modulus still the one which i used in the first ste.

the model is so simple, it is a block, i squeeze this block, i made a set its name is all. I name this set when i define the section. I read some posts that the name of the set should correspond to the instance (assembly) i try to use this name, but it did not work also. 

*Material ,
name=Material-1
*Elastic, dependencies=1
 3E+06, 0.3, ,  0.
30000., 0.3, ,  1.

 *Initial
conditions,type=field,variable=1
All,0

 ** STEP: Step-1
*Step, name=Step-1
*Static
1., 1., 1e-05, 1.

 ** STEP: Step-2
*Step, name=Step-2
*Static
1., 1., 1e-05, 1.
*Field, variable=1
All,1

 Thank you.

A PhD opportunity in the field of computational and applied mechanics is available in the department of Civil and Environmental engineering at the University of Illinois at Urbana-Champaign.

Qualifying candidates must have a strong background in mechanics and mathematics. Familiarity with scientific computing in one of the widely used programming languages (e.g. Fortran, C++ or Python)is required.

Primary focus will be on multiscale modeling of fractures in heterogeneous quasi-brittle materials with applications in the field of earthqauke dynamics and bone mechanics 

If you are interested please send your C.V. to : elbanna2@illinois.edu

Job Description

Title: Materals Scientist- Solar Wafering R&D   

Reporting to: Director, Solar R&D

Location:St. Peters, MO (Corporate)                 

­­­­­­­­­­­­­­­­­­­­­_______________________________________________________________________

SUNEDISON is a global leader in the manufacture and sale
of wafers and related intermediate products to the semiconductor and solar
industries. With R&D and manufacturing facilities in the U.S., Europe and
Asia, SUNEDISON enables the next generation of high performance semiconductor
devices and solar cells. At SUNEDISON, we are looking for talented individuals who are original thinkers, with
the ability to succeed in a team environment and the capacity to assume
increasing responsibility in a highly successful global organization.

Primary Responsibility:

Develop and demonstrate new slicing technologies for silicon solar wafers. Develop and
test new materials and new equipment for slicing silicon. Collaborate in the
development of new quantitative models for slicing processes and product
properties from slicing. Support Sunedison’s solar factories with travel up to
50% of the time.  Proactively communicate and collaborate with management, team members and fellow scientists.

Candidate Qualifications:

Education: PhD in Materials Science is preferred. In-depth knowledge of
materials science with detailed knowledge of fracture mechanics, friction and
abrasion science and mechanical properties of ceramics is desired.  The candidate should have hands-on expertise
with ceramics testing and characterization equipment and experience in
mathematical modeling of ceramic behavior and properties.

Job related experience: Experience in silicon processing is desired but not required.

Other competencies: Data-driven, detail-oriented, persistent, highly collaborative

The candidates are requested to send their
resumes to Dr. Larry Shive at LShive@SunEdison.com and give reference to posting on iMechanica. 

One Post-Doc position is now available at the Institut für Angewandte Mechanik of the Technische Universität Braunschweig, Germany, within the ERC Starting Researcher Grant "INTERFACES". The position is a full-time fixed-term position for 2 years with the possibility of renewal.

The successful applicant will conduct research on topics related to interface mechanics, contact and fracture mechanics, multiscale and multiphysics methods, and isogeometric analysis. Targeted experimental validation of computational methods is also foreseen. The selected individual will be also expected to engage in teaching of classes for Master courses in English.

Applicants should possess the following qualifications/attributes:

(a) a PhD degree in computational mechanics;

(b) outstanding background in continuum mechanics and numerical methods, and excellent programming skills;

(c) strong motivation and enthusiasm to carry out high-quality research;

(d) proficiency in English and possibly also in German.

If you meet the above requirements and are interested in this position, please email your CV, including your detailed transcripts, a list of publications, copy of the most relevant publications and a short personal statement explaining why you are interested in the position to prof. Laura De Lorenzis, l.delorenzis@tu-braunschweig.de, as soon as possible.

Hello

How should i model crack propagation in MSC PATRAN with VCCT Modoule? is there any manual about that 

The
Center for Mechanics of Solids, Structures and Materials has immediate openings
for two post-doctoral positions, dealing with (i) laboratory experiments on hydraulic
fracture and (ii) ductile failure in metals. The primary focus in both
investigations is on performing laboratory experiments that are then followed
by appropriate analyses. Candidates with a strong background in solid mechanics
and experience in experimental solid mechanics are encouraged to contact Professor
Ravi-Chandar (ravi@utexas.edu).

The Automated Computational Mechanics Laboratory (ACML) at The Ohio State University announces a new PhD position available for Spring 2014. The related research project focuses on the application of an advanced finite element method for simulating damage and crack propagation in heterogeneous composites. Applicants with strong background in computational solid mechanics are encouraged to apply by 09/15/2013. Please also send a copy of your CV, a two-page SOP, and the contact information of at least three references to Dr. Soheil Soghrati (Soghrati.1@osu.edu). 

How to model Bimodulus Material in ANSYS or any Finite Element Analysis software to find out Neutral axis shift in simple bend test.

there is a phd position on investigation of fracture mechanism of spot welds in automotive steels, 

the funding is available for UK/EU nationals

please go to

http://www.shef.ac.uk/mecheng/phd/projects/deformation-spot-welding 

for further information.

This is a call of interest for a post-doc position (1 year renewable up to 3 years) at the IMT Institute for Advanced Studies Lucca, Italy (www.imtlucca.it), in the field of computational damage and fracture mechanics. The activities are in the framework of the ERC Starting Grant IDEAS "Multi-field and multi-scale Computational Approach to design and durability of Photovoltaic Modules" (Prof. Paggi, Principal Investigator).

For more details about the project, see:

http://staff.polito.it/marco.paggi/CA2PVM.htm

and for the research unit Multiscale analysis of materials - MUSAM:

http://musam.imtlucca.it

Topic:

Computational fracture and damage mechanics models for silicon photovoltaics

Activities:

- Development of new damage mechanics and fracture mechanics models for modelling fracture in mono or polycrystalline silicon solar cells.

- Implementation of the models in the finite element analysis programme FEAP.

- Numerical simulations of photovoltaic modules in multi-physics, including the effect of thermo-mechanical deformations and comparison with experimental results.

- General support to the research/didactic activities of the research unit.

Required skills:

- Excellent track record of publications in computational mechanics;

- Programming in Fortran;

- Documented experience in implementing user element subroutines in FEAP, ABAQUS or similar finite element software.

Salary and benefits:

A competitive salary at the European level will be provided. Benefits include the accommodation inside the university campus

for up to 1 month from the job starting date and lunch and dinner in the university canteen for the whole scholarship duration.

Date of appointment:

As soon as possible, presumably by Spring 2014 (February or March 2014).

Please send your statement of interest by email to:

Prof. Marco Paggi

marco.paggi@imtlucca.it

including:

- detailed CV;

- full list of publications;

- 3 selected articles published in international journals (possibly related to the topic of the call).

Applications are invited for few open positions in the area of
multiscale simulation of fatigue and fracture of advanced alloys and
nano-material based composites. Primary focus of this research is investigation
of fatigue and fracture behavior of nanomaterials and to develope various
constitutive models for continuum, based on large scale atomistic simulations.
Research effort will include development of analysis and design methods toward
improving material/structural behaviour using computer simulation. Interested
candidates should have preferably MTech/ME degree in
mechanical/civil/aerospace/material engineering discipline with good knowledge
of basic finite element method, solid mechanics/material science/ physics, and
preliminary experience in finite element simulations (Preferably Nastran,
LsDyna, and Abaqus) and molecular dynamics (LAMMPS). Exposure to computer
programming with C/C++/fortran and Matlab would be advantageous. Candidates
having experimental background in material/structural mechanics/nano-materials
with interests in multiscale response of materials and structures are also
welcome to apply.

 Interested candidates may contact Prof D Roy Mahapatra (droymahapatra@aero.iisc.ernet.in) or
Vijay Kumar Sutrakar (vijay.sutrakar@gmail.com) with
detailed bio-data. 

Good mourning, i am using Abaqus software to inverstigate a crack propagation problem using Abaqus, in this regards i have created a seam crack iner the geometrie which is a plate  under a plane stress condition, my problem is how to mesh around the crack tip in order to have a regular mesh around the crack tip so i can evaluate J integral for multiple contours, the Abaqus documentation mention the swept meshing technique but i coudn't find something about a 2D problem since the sweapt meshing technique nead to mesh a section and swept it over the rest of the body, and in 2d problem we have eages, so how to use it 'some basics rules' in order to creat a regular mesh around the crack tip, i am waiting for any answer from you guys, thank you

The class started today.  I'll be teaching fracture mechanics this semester.  I'll be mostly using the class notes I wrote in 2010, but will post updated ones. 

In today's class I covered "Trouble with linear elastic theory of strength."  I have just posted updated notes of the lecture.  The new notes begin with the follwoing paragraphs.

The toughest hydrogel in the world.  We reported an exceptionally tough hydrogel:  Jeong-Yun Sun, Xuanhe Zhao, Widusha R.K. Illeperuma, Kyu Hwan Oh, David J. Mooney, Joost J. Vlassak, Zhigang Suo. Highly stretchable and tough hydrogels. Nature 489, 133-136 (2012).  A hydrogel is a three-dimensional polymer network swollen with water.  Familiar examples include jello and contact lenses.  Our hydrogel achieved a toughness of ~9,000 J/m2.  This statement raises several questions.

What is toughness?  Toughness is the ability of a material to resist the growth of crack.  Understanding toughness is a main object of this course.

What does the value 9,000 J/m2 mean?  We will talk about how to measure toughness later in the course.  For now, you can have some feel for orders of magnitude.  Jello and tofu have toughness ~10 J/m2.  Contact lenses have toughness ~100 J/m2.  Cartilage has toughness ~1,000 J/m2.  Natural ruber has toughness ~10,000 J/m2.  Our tough gel contains about 90% water, yet its toughness approaches that of the natural rubber.    

How can our hydrogel be so tough?  For now let’s have a qualitative picture.  A window glass is brittle, but a steal is tough.  That is, the ability of a window glass to resist the growth of a crack is much less than the ability of a steel to resist the growth of a crack.  This is everyday experience, but why?  The answer to such question sooner or later leads to an atomistic picture. 

You prepare a sheet of glass.  To study the growth of the crack, you cut a crack into the glass with a diamond saw.  You then pull the glass to cause the crack to grow.  The crack grows by breaking atomic bonds.  The tip of the crack concentrates stress, so that the atomic bonds at the tip of crack break.  As the tip the crack advances, a plane of atomic bonds unzips.  Atomic bonds off the plane of the crack remain elastic, and do not participate in resisting the growth of the crack.  The elasticity is visible:  after fracture, the two halves the glass fit together nicely.

Now you prepare a sheet of steel with a pre-cut crack.  You then pull the steel to cause the crack to grow.  The crack grows by breaking atomic bonds, but something else happens.  Atomic bonds off the plane of the crack no longer remain elastic:  they change neighbors.  That is, the steel off the crack plane undergoes plastic deformation.  The amount of material involved in plastic deformation is much, much more than the two planes of atoms on the surfaces of the crack.  The plastic deformation enables the steel to resist the growth of the crack much more than breaking a plane of atomic bonds.  The plasticity is visible:  after fracture, the two halves the steel do not fit together nicely.

Our hydrogel is tough because the growth of a crack does more than breaking a single layer of polymer chains.  The polymer off the plane of the crack undergoes deformation similar to plastic deformation in the steel.

We will make this picture precise as we go along in this course.  But if you absolutely cannot wait to know how our gel works, I’d be delighted if you read the paper now.   

I have updated my notes on the Griffith paper.  I added more description on the experimental determination of surface tension of solids.  Griiffith himself determined the surface tension of glass by an experimental setup.  Udin et al (1949) described a setup based on the same principle.  This setup is now known as the zero creep experiment.

In class today Chao Chen asked me to compere Inglis theory and Griffith theory, which I did at the very end of the notes.  The two theories give the same prediction: 

the strength times the squre-root of the crack length  is a material constant.

In the Inglis theory, the constant involves atomic strength and atomic size.  In the Griffith theory, the constant involves Young’s modulus and surface energy.  If we adopt any simple-minded atomic model, we can show that the two constants are essentially the same.

Both theories work well for silica glass.  Neither works for steel.  Both theories survived to this day, in somewhat different forms.  In general terms, the Inglis theory has evolved into the stress approach to fracture, and the Griffith theory has evolved into the energy approach.  The two approaches are, of course, equivalent.  We will talk more about both approaches in coming lectures.

I have an open position for a Post-doctoral researcher in the area of biomimetic materials, starting immediately. The successful candidate will explore and optimize bioinspired microarchitectures to increase the mechanical performance of engineering materials (glasses, ceramics, polymers).  This work will expand on our recent progress on overcoming the brittleness of glass (http://barthelat-lab.mcgill.ca/publications.html). Materials and systems of interest include nacre-like ceramic / polymeric composites, multilayered conch-shell like composites and fish-scale inspired flexible protective systems.

The candidate will use combinations of modeling (theoretical and finite elements), design optimization, innovative fabrication methods (3D printing, 3D laser engraving) and mechanical testing.

Required background: Mechanics of materials, composites, fracture mechanics, experimental mechanics and finite elements.

Preferred but not required: background in biological / biomaterials / biomimetic materials.

Send full CV to francois.barthelat@mcgill.ca
Website: http://barthelat-lab.mcgill.ca/

The Department of Civil and Environmental Engineering at the National University of Singapore (NUS) is recruiting 2 post-doctorate research fellows to pursue research on ice-structure interaction in the Keppel-NUS Corporate Laboratory. As part of the S$75 million collaboration between Keppel Corporation and NUS, the team comprising of Prof. Andrew Palmer, Dr. Bai Wei, and Dr. Pang Sze Dai, seeks to develop solutions for offshore rigs to meet the challenges of harsh arctic environments in oil and gas exploration and production.

The candidate should posses a PhD degree with strong background in solid mechanics. Relevant expertise in ice physics/mechanics, ice-structure interaction or proficient in LS-DYNA software will be positively considered. The appointment will be for two years in the first instance, and renewable for up to five years depending on performance. The remuneration and benefits are internationally competitive, and commensurate with qualifications and experience. Leave and medical benefits will be provided.  Review of applications will begin immediately and continue until the position is filled. Only shortlisted candidates will be notified and the fellowships can be offered immediately for suitable candidates. Successful candidates have an opportunity to be considered for a position in Keppel Corporation at the end of their fellowship.

To apply, please email the following documents to Dr. Pang Sze Dai at ceepsd@nus.edu.sg
1.   Cover letter
2.   A research statement summarizing the key research experience & expertise
3.   Curriculum Vitae including a list of publications (with three sample publications)

About National University of Singapore (NUS)
NUS is a leading global university centered in Asia. In the 2012 QS World University Rankings, NUS is ranked 25th in the overall ranking and 5th in Civil Engineering.

About Keppel Corporation
Keppel Corporation is the world's largest builder of offshore oil rigs. It has built close to half the world's jack-ups since 2000. Today, they are the global leader in the design, construction and repair of mobile offshore rigs.

Information about working and living in Singapore is available at: http://www.contactsingapore.sg/

In our recent paper, atomistic and continuum modelling of temperature-dependent fracture of graphene, we directly calculate J integral using the data obtained from molecular dynamics simulations. Fig. 1 outlines the calculation procedure of JIC. Fig. 1(a) shows the changes in potential energy with time (or applied strain) in an armchair graphene sheet with a size of 7.6 nm × 7.6 nm. A crack, length of ~0.7 nm, is placed in the centre of the sheet. Periodic boundary conditions are used along in plane directions. Simulation temperature is 1 K, and strain rate is 0.001 ps-1. Fig 1(b) shows the variation in potential energy during the crack propagation. It can be seen that the potential energy increases just after the crack starts to propagate (around point d). This is due to the chemical potential energy release from carbon-carbon bond breaking overcomes the strain energy release by crack propagation. As more bonds break, the strain energy release due to crack propagation starts to govern the total strain energy release. The crack propagation at various stages (marked as d to g in Fig. 1(b)) is shown in Fig. 1(d) to Fig. 1(g). The figures show that the crack propagates symmetrically. The out of plane deformation of the sheet, as shown in the video 1, prevails.


Fig. 1 Calculation of energy release rate of graphene. (a) Variation of potential energy with time. (b) and (c) variation of potential energy during the crack propagation. (d) to (g) show the crack propagation in graphene. The corresponding positions of Fig. (d) to (g) in the potential energy-time curve are marked in Fig. (b)

The slope of the piece wise continuous curves in Fig 1(c) is proportional to the critical value of J integral (JIC). Figure 2 shows the variation of JIC with the propagated crack length (2ap), which has been normalized with respect to the width of the sheet (w). The value of 2ap/w is approximately 0.1 when a crack starts to propagate since w is kept around 10 times the initial crack length (2a) to avoid the effects of finiteness. When 2ap/w reaches 1, the periodic cracks start to interact with each other. Therefore Fig. 2 shows the value of JIC up to 0.8 of 2ap/w, where the periodic cracks do not interact with each other for the smallest sheet considered (i.e. w = 7.6 nm).

Fig. 2 Variation of JIC of armchair graphene with propagated crack length (2ap) for various initial crack lengths (2a). The solid symbols indicate the average value of JIC (JIC,avg) at various crack lengths. The left most solid symbol is the JIC,avg for 2a = 0.73 nm and other marks are in ascending order of initial crack lengths. The right most symbol is the JIC,avg for 2a = 3.63 nm.

Video 1: Crack induced ripples and fracture of an armchair graphene sheet with a central crack. The colour of atoms indicates the out of plane movement of atoms.

In armchair graphene sheets, crack propagates perpendicular to the applied strain, whereas crack propagation in zigzag sheets occurs at an angle to the straining direction. This occurs due to different bond structure along armchair and zigzag directions as shown in Fig. 1. Videos 1 and 2 show the fracture of armchair and zigzag sheets, respectively.

Fig. 1: Armchair and zigzag directions of graohene

Video 1: Fracture of an armchair graphene sheet. The colour of atoms indicates the out of plane (z) movement of atoms.

Video 2: Fracture of a zigzag graphene sheet. The colour of atoms indicates the out of plane (z) movement of atoms.

In our recent study, published in Int. J. Fract., we found that quantized fracture mechanics theory [1] is more accurate compared to Griffith’s energy balance criterion in predicting the fracture strength of graphene. Figure 2 compares the fracture strength of armchair (2a) and zigzag (2b) graphene given by molecular dynamics, quantized fracture mechanics theory, and Griffith’s criterion.

Fig. 2: Comparison of the ultimate strength of (a) armchair and (b) zigzag sheets given by molecular dynamics, Griffith, and quantized frature mechanics.

Reference
[1] Pugno NM, Ruoff RS (2004) Quantized fracture mechanics. 
Philos Mag 
84:2829-2845

Dear Colleague,

this is to inform you that the research unit MUSAM "Multi-scale Analysis of Materials" (http://musam.imtlucca.it) at the IMT Institute for Advanced Studies Lucca (Italy) has opened 1 Post-doctoral Fellow position (1 year but renewable for a maximum of 3 years in total) on Computational mechanics applied to solar energy materials, related to the ERC Starting Grant CA2PVM
(http://musam.imtlucca.it/CA2PVM.html) and under my supervision.

The link to the call is:
http://www.imtlucca.it/faculty/positions/junior_faculty_recruitment_prog...

The link to the application form is:

http://www.imtlucca.it/faculty/positions/young-research-fellows_position...

The deadline for the online application is March 21, 2014 at 12:00 (Italian time).

Please distribute this message to any candidate you might believe could be interested in the topic.

Thank you very much in advance for your attention and best regards, Marco Paggi

______________________________________
Prof. Dr. Ing. Marco Paggi
Associate Professor of Structural Mechanics Research unit MUSAM - Multi-scale Analysis of Materials, Director

IMT Institute for Advanced Studies Lucca
Piazza San Francesco 19
55100 Lucca, Italy

E-mail: marco.paggi@imtlucca.it
Mobile: +393403403416
Tel: +39 0583 4326 604
Fax: +39 0583 4326 565
http://www.imtlucca.it/marco.paggi
http://musam.imtlucca.it

I’ll present this below without the answer, in case you want to enjoy a little brain teaser. It is a solid and experimental mechanics problem that, while not terribly practical, I found very interesting:

A part fractures cleanly in two by brittle fracture (no plasticity) under the action of residual and applied stresses. You only have the broken part in front of you, no prior information.

 What were the original residual stresses on the fracture plane?

Should this problem be solvable? The original stresses were of course relaxed by the fracture. There are no longer stresses to measure.

I won’t spoil the answer for you in case you want to think about it yourself. The solution is available at http://www.lanl.gov/contour/fracture.html, which proves the method on a fractured aluminum forging, with the results validated by neutron diffraction measurements. Just published in EFM.

One PhD position in "Fracture of Arctic Materials" at the Norwegian University of Science and Technology (NTNU), Norway.

I am interested in developing a global-local finite element model (micro/macro) to simulate flexural testing of a composite material. Flexural loading will be applied on global model (macro) and crack propagation will be simulated in the local model (micro). I want to compare stress intensity factor or any other fracture property obtained from local model (micro) with that of experimental results.

I would appreciate if anyone could suggest some references/literature in this area. Any kind of suggestions would be great!

 Venkata

I am working on the validation of CTOD.

In the evaluation of CTOD using the
J-integral approach as applied in ASTM E1290 and E1820, the plastic J
component is defined as (Npl*Apl)/(Bn*Bo)
Npl=dimensionless constant(plasticity)
Apl=area under load vs. displacement plot
Bn=ligamen length (W-a)
Bo=section thickness

On E1820 there are different functions provided for Npl if Apl is
evaluated differently (CMOD or load-line displacement).

Do anybody know what are the relation of the Npl to Apl and how they interact
for the J-integral evaluation?

Research Associate in Fractured Rock Hydrology
Imperial College London
Department of Earth Science and Engineering

A fixed term post for up to 36 months
Salary: £32,750 per annum

The Department of Earth Science and Engineering at Imperial College has an opening for a
Research Associate to work on Work Package 1 of the “HydroFrame” radioactive waste
disposal project. This project, a collaboration between Imperial College, the University of
Leeds, and the University of Birmingham, is funded by the UK Natural Environment
Research Council (NERC), the UK Environment Agency (EA), and the UK Nuclear
Decommissioning Authority (NDA), as part of the RATE Programme (Radioactivity and the
Environment).

The main aim of Work Package 1 is to develop analytical methodologies for quantitatively
estimating the macroscopic-scale hydraulic transmissivity of three-dimensional fracture
networks. The emphasis will be on geologically realistic fracture networks such as are
observed in outcrops, or which are generated by geomechanically rigorous finiteelement/
discrete-element codes. The successful candidate will collaborate closely with a
multidisciplinary team, and will be expected to regularly publish papers in international
refereed journals, and to give presentations at relevant international conferences.
Applicants should hold a PhD (or equivalent) in a relevant area of Earth Science, Petroleum
Engineering, or Civil Engineering. They should have a strong basic knowledge of rock
mechanics and hydrology, and experience in using hydrological and hydro-geomechanical
codes. Experience in programming in an object-oriented language is also advantageous.
Applicants must have excellent communication skills, be able to organise their own work with
minimal supervision, and to prioritise their work to meet deadlines. Preference will be given
to applicants with a proven research record and publications in relevant areas. All applicants
must be fluent in spoken and written English.

The successful candidate will be part of the Petroleum Engineering and Rock Mechanics
Group in the Department of Earth Science and Engineering, and will work under the
supervision of Professor Robert Zimmerman, and in collaboration with Dr Adriana Paluszny
and Professor John Cosgrove.

Applications can be submitted online via our website at the following link:

http://www3.imperial.ac.uk/employment (please select “Job Search” and enter the job
reference EN20140067FH). Please complete and upload an application form as directed,
and submit any other relevant supporting documents, such as your full CV.
If you have any queries please contact Mrs Darakshan Khan (d.khan@imperial.ac.uk)
Closing date: 6 April 2014

Committed to equality and valuing diversity. Imperial is also an Athena Silver SWAN Award
winner, a Stonewall Diversity Champion and a Two Ticks Employer.

The Department of Energy Conversion and Storage at the Technical University of Denmark (DTU) and Haldor Topsøe A/S (HTAS) is seeking a candidate for a PhD position in analysis of fracture in porous ceramic steam-reforming catalysts by use of X-ray tomography.

Responsibilities and tasks


The PhD project will be performed within the scope of the CINEMA project (The alliance for imaging of energy materials) running between 2014 and 2018. CINEMA is a large strategic alliance project involving several universities and companies, whose primary aim is to investigate mass transport properties and microstructure in functional porous materials and damage mechanisms in porous and composite energy materials. A CINEMA cornerstone is the exploitation of in-situ 3D experiments for the improvement of 3D models of energy materials. In this PhD project the mechanical behavior is in focus.

The PhD project aims towards improving the fundamental understanding of tableting and sintering of porous ceramic steam-reforming catalyst tablets with the most advanced tools available, i.e. microstructural finite element models and in situ fracture mechanical, X-ray tomography experiments. The project will thus focus on studying the evolution of the pore system, grain size and morphology and possible flaws occurring during compaction and sintering of catalyst supports.

This will be done by in situ 3D imaging, which allows for visualization of the sintering body. The experimental results will be complemented with finite element models of the stresses developing in the sintering tablet, and the evolution of cracks and pore systems. Furthermore, there are opportunities to do post mortem analysis of broken tablets to determine failure modes, and in situ fracture mechanical experiments to determine fracture energy. The experiments will be combined with microstructural finite element models to study the propagation of crack paths in porous ceramics.

You will need strong competences in: solid mechanics and FE modeling, and preferably also some knowledge about either fracture mechanics, ceramics, mechanical testing and multi-scale modeling.

You will be employed at the university but you will share your time between the university (DTU) and the company (HTAS) to obtain the most recent knowledge from both worlds. 

As a CINEMA PhD candidate you will interact regularly with the CINEMA project team, researchers at DTU Energy Conversion and project partners (including industrial partners). The PhD position has a multidisciplinary nature and thus you will need to draw on the knowledge of several experts to reach the project aims.

Qualifications

•Master degree in Mechanical Engineering, Civil Engineering, Physics, or similar.

•Good communication skills in both written and spoken English.

•Interest and experience with both hands-on experimental work and data analysis based on theory

•Ability to work independently, to plan and carry out complicated tasks, to be part of a dynamical multi-disciplinary group, and to network both with project partners and international collaborators.

Supervisor team

Henrik Lund Frandsen (DTU, main supervisor), Anna Puig Molina (HTAS), Bent F. Sørensen (DTU), Henning Friis Poulsen (DTU)

The working environments

DTU Energy Conversion is among the world’s leaders in the research and development of solid oxide fuel cells (SOFCs) and other energy conversion technologies. DTU Energy Conversion has cutting edge facilities and competences for fabrication, testing and characterization of energy conversion technologies. DTU Energy Conversion has around 200 employees working with interdisciplinary topics within the mentioned technologies.

Haldor Topsøe A/S is a market leading company in the field of heterogeneous catalysis. Haldor Topsøe A/S supplies catalysts and technologies for the refining industry, for cleaning power industry flue gases and for sustainable energy processes. In 2012 the turnover totaled 700 million Euro generated by the 2,400 employees around the world. Haldor Topsøe A/S has extensive knowledge on catalyst production, catalysis and technology.

Approval and Enrolment


The scholarship for the PhD degree is subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the PhD guide. 



Salary and appointment terms


The salary and appointment terms are consistent with the current rules for PhD degree students in Denmark. 

The period of employment is 3 years and is based at DTU Energy Conversion on the Risø Campus.



Further Information


Applicants are welcome to contact the project supervisors: Henrik Lund Frandsen or Bent F. Sørensen, for more information.

General information about the Energy Conversion Department is available at http://ecs.dtu.dk, Haldor Topøse A/S at http://www.topsoe.com and about the CINEMA project at http://cinema-dsf.dk



Application


We must have your online application by Sunday 1st of June 2014, and it should be submitted here . Material received after this date will not be considered. Please open the link "apply online", complete the application form and attach the following mandatory documents:

•A letter motivating the application (cover letter)

•Curriculum vitae

•Grade transcripts and BSc/MSc diploma

•Excel sheet with translation of grades to the Danish grading system (see guidelines and excel spreadsheet here)

Candidates may apply prior to obtaining their master's degree, but cannot begin before having received it.

Job interviews will be scheduled within two weeks after the application deadline.

All interested candidates irrespective of age, gender, race, inability, religion or ethnic background are encouraged to apply.

A Postdoctoral Research Fellow position in computational damage mechanics is
available immediately at Masdar Institute of Science and Technology in Abu
Dhabi in United Arab Emirates. Masdar Institute is established in collaboration
with Massachusetts Institute of Technology. The research project focuses on
using advanced computational fracture and damage mechanics for simulating the
behavior of advanced materials under different loading and environmental
conditions. The candidate is expected to have a PhD in the field of Mechanical,
Civil, or Aerospace Engineering with solid knowledge of theoretical/computational
solid mechanics; continuum damage mechanics, fracture mechanics,
viscoelasticity/ plasticity/ viscoplasticity theories, finite element
implementation of computational models using UMAT/VUMAT in Abaqus. See attached
file for more details.

Email Professor Rashid K. Abu Al-Rub for more information at rabualrub@masdar.ac.ae

Hi, all,

I am Kun Luan, a doctoral graduate from China. I am now looking for a postdoc position in damage tolerance, failure analysis, and fracture mechanics for composite materials, and advanced numerical methods for structural analysis. I already got my PhD degree of engineering in March 26,2014.  

I have published several papers and wrote three book chapters during my doctoral research, and applied two Chinese patents.

Attachments are my CV and two pubilished papers, please review them and help you to know me well.

Here is the partially publications of me (as First Author)

1. Kun Luan, Baozhong Sun, Bohong Gu. Energy absorption of 3-D angle-interlock woven composite under ballistic penetration based on a multi-scale finite element model. International Journal of Damage Mechanics. Online, DOI: 10.1177/1056789514520800.
2. Kun Luan, Baozhong Sun, Bohong Gu. Ballistic impact damages of 3-D angle-interlock woven composites based on high strain rate constitutive equation of fiber tows. International Journal of Impact Engineering. Vol.57 (2013), pp. 145-158.
3. Kun Luan, Baozhong Sun, Bohong Gu. A Multi-scale Geometrical Model for Finite Element Analyses of Three-dimensional Angle-Interlock Woven Composite under Ballistic Penetration. Computer Modeling in Engineering & Materials. Vol.79 (2011), No.1, pp.31-62.

4. Kun Luan, Baozhong Sun, Bohong Gu, Jiajin Zhang. Structural and properties of green composite made from ramie fabric and polypropylene matrix and its application in FEM analysis of eco-power automobile body. Advanced Materials Research, Vols. 287-290 (2011), pp. 405-409.
5. Kun Luan, Fa Zhang, Liwei Wu. Quasi-static tensile properties and damage mechanism of Three-dimensional Angle-interlock Woven Composites. Applied Mechanics and Materials. Vols. 182-183 (2012), pp. 148-152.

Book Chapters (as co-author)
1. Kun Luan. Chapter 9: Ballistic Damage of Three Dimensional Angle Interlock Woven Composite. Bohong Gu, Baozhong Sun (eds). Impact Dynamics of Textile Structural Composite. [M] Beijing: Science Press. 2012. (In Chinese)
2. Kun Luan. Chapter 6: Mechanics of Woven Fabrics. Chapter 13: 3D Fiber Assemblies. Bohong Gu, Baozhong Sun (eds). Mechanics of Fiber Assemblies. [M] Shanghai: Press of Donghua University. 2014.(In Chinese)
3. Kun Luan. Chapter 7: Mechanics of Woven Composites. Bohong Gu, Baozhong Sun (eds). Mechanics of Fiber Reinforced Composite Materials. [M] Shanghai: Press of Donghua University. 2014. (In Chinese).

This is a reminder to invite you to submit an abstract for the 24th International Workshop on
Computational Mechanics of Materials (IWCMM 24) in Madrid, Spain on October 1st-3rd.
The abstract submission will close in
less than 3 weeks.

The workshop will cover many aspects of modeling and
simulations of the mechanical behavior at different length and time scales:
from ab-initio to continuum models. The materials of interest range from
alloys, polymers and composites to advanced and emerging materials and
bio-materials. A special issue on Computational Micromechanics of Materials
will be published on the journal Meccanica (Ed. A. Carpinteri, impact
factor 1.747) with the best contributions to the workshop.

The workshop will feature 5 plenary lectures given by

• Prof. H. Bohm (Technical university of Vienna)
• Prof. M. Fivel (Grenoble INP)
• Prof. A. Hartmaier (Ruhr-Universität Bochum)
• Prof. C. González (IMDEA Materials Institute & Polytechnic
  University of Madrid)
• Prof. P. Suquet (LMA, CNRS)

More details about the workshop can be found at the
webpage http://www.iwcmm24.org

Looking forward to your participation in IWCMM 24, yours
sincerely,

Javier Segurado

Javier LLorca

Siegfried Schmauder