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matlab code to create cohesive elements (or UMAT) in any 2D mesh

To use cohesive elements, normally user can add a layer of elements between neighbouring node pairs. This matlab code can help you to process that especially your FE mesh is irregular. The code, the initial .inp file and corresponding out put files are attached for a better illustration. The new generated cohesive elements won't cause any trouble in the element number. Also you can apply this code to generate new UMAT elements in mesh.


CONCREEP-10 Conference - Abstract Submission Deadline is November 30

Dear colleagues,

The CONCREEP-10 Conference "Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures" will be held at Vienna University of Technology (TU Wien), Vienna, Austria, September 21-23, 2015.  Please note that the deadline for abstract submission for the CONCREEP-10 conference is November 30, 2014.

Pablo Zavattieri's picture

Post-doctoral position at Purdue University in computational modeling of biomineralized materials

Applications are invited for a postdoctoral position in the Computational Multi-Scale Materials Modeling Lab in the Lyles School of Civil Engineering at Purdue University to work with a multidisciplinary/multiuniversity team in the area of modeling of biomineralized and bio-inspired materials. The goal of the program is to uncover fundamental design rules and develop simple and basic scientific foundations for the predictable design of bio-inspired materials that are light-weight, tough and strong.

Cai Wei's picture

Postdoctoral Position Opening at Beijing Computational Science Research Center (CSRC)

Beijing Computational Science Research Center (CSRC) a newly established interdisciplinary institute in China is recruiting multiple postdoctoral positions ( to conduct top research in computational sciences in condensed matter physics, quantum optics, biological sciences, and material sciences and advance algorithm developments.

Abaqus Unit Consistency (micrometer)

Hi All,

Am confused, and messy with a very basic thing, Units! I am modelling spherical with radius in micro-meters (1m~10^6 u m). The shear stress and pressure , in the problem is given in Pascals (N/m^2), 414 and 890 Pascals respectively. What will be my values for them in Abaqus, if units are to be consistent. Please help and thanks in advance my fellow bright researchers.



Orthotropic plane strain & plane stress Constitutive matrix for micropolar elastic media

Hi all, 

     Could anyone please help me  finding the constitutive matrix for orthotropic plane strain and plane stress in cosserat elastic continua ?  I have done searches with micropolar orthotropic 2D , cosserat orthotropic 2D/ Plane strain etc. But couldnot get it. 

Also, what all changes one should make if I try extending the orthotropic elastic plane strain and plane stress constitutive relations for classical mechanics to the micropolar media? 

Thanks in advance,


Pradeep Sharma's picture

Reminder (Deadline, Dec 5th): Call for Nominations for the Eshelby Mechanics Award for Young Faculty

It is my pleasure to solicit nominations for the "Eshelby Mechanics Award for Young Faculty". This award, launched in 2012, is given annually to rapidly emerging junior faculty who exemplify the creative use and development of mechanics. The intent of the award is to promote the field of mechanics, especially among young researchers. While interdisciplinary work that bridges mechanics with physics, chemistry, biology and other disciplines is encouraged, the ideal awardee will demonstrate clear inspiration from mechanics in his/her research.

Aifantis International Symposium 2015 October - Antalya, Turkey

Dear Colleague,
We are sending you this message to let you know that the Aifantis International Symposium, dedicated to the life time achievements of Prof. Elias C. Aifantis, Emeritus Professor, Michigan Technological University, Houghton, USA and Honorary Professor, Aristotle University, Thessaloniki, Greece, will be held from 4-9 October 2015 in Antalya, Turkey.

Expectation of higher order moment (Bayesian Stats)

I am taking a course in Bayesian statistics, which is off my field. In the lecture notes, the instructor showed

E[X^2n] = (2n-1) σ^2n

and E[X^3 . Y] = E[Y^3 . X] = 3.ρ.σ^4  

where  σ = variance

E = expectation

X is a random variable.

ρ = cor(XY) = E[XY]/σ^2

Can anyone kindly explain how these equations were derived or atleast point me towards some text where I can understand this? Is this to do with the moment generating function?



Can anyone help me with some examples of XFEM implementation in LS-DYNA? Also, is XFEM in LS-DYNA currently applicable with shell elements only?

Thank you,


Wenbin Yu's picture Online Composites Community of the Future

I thought this might be of interest for some imechanicans, particularly those who work on composites (anisotropic and/or heterogeneous materials). Sorry if it sounds a bit infomercial. 

Imagine a youtube-like environment for you to deploy a cloud version of your code without any change to your original code. Your research code can be immediately shared with the global community. 

Full Professorship on Computational Continuum Mechanics

open position: Full Professorship on Computational Continuum Mechanics at the Faculty of Civil and Environmental Engineering, University of Stuttgart, Germany

saberelarem's picture

PhD Research Projects offered for 2015

ParisTech Doctoral Institute and ParisTech local branch in China have launched a coordinated recruitment procedure in the framework of an agreement with the China Scholarship Council (CSC). This program is open to highly qualified Chinese students interested in carrying on doctoral training at ParisTech with financial support of the CSC.

differentiation of Strain energy Function

I am having problem to find "Cauchy stress(σ) " and " Spatial elastic Tensor (c)" from the "strain energy function (ψ)" using 2nd Piola Kirchhoff stress ( S) of transversely isotropic hyper-elastic material. as per the Mechanics the 

Speech of Acceptance of the 2014 Timoshenko Medal by Robert M. McMeeking

Applied Mechanics Division Banquet, Palais des congrès de Montréal, Quebec, Canada, November 18th, 2014.

Now I can say whatever I like in my Timoshenko Lecture and it won’t matter – because you will only remember Ken Liechti playing the bagpipes and, perhaps, the kilts.  Thank you Ken.

Modelling cartilage using Hyperelastic+Permeability in ABAQUS


I am modeling a contact problem. I have chosen Hyperelasticity+permeabilty for catilage material. I apply a displacement over a short time and fix it over a long time to see the force relaxation procedure. during loading time we assume that the boundries ar impermeable but over long time are permeable.

there are some questions that I'm facing with:

1) Shall I use one step and put permeable Boundaries?

Postdoctoral Research Position in Structural-Scale Life Prediction of Aero-Structures Experiencing Combined Extreme Environments

The objectives of this project are to develop methods to probabilistically predict the life of aero-structures subjected to combined extreme environmentsand also to quantify confidence in the predicted margins of safety on the life.

MMAEatIIT's picture

Illinois Institute of Technology - Mechanical, Materials and Aerospace Engineering Department - Multiple Faculty Positions

Applications are invited for multiple tenure-track faculty positions at the assistant or associate professor level. The MMAE Department at IIT is seeking candidates with interdisciplinary research interests contributing to one or more of the department’s areas of strategic research emphasis, which include (1) mechanical design, (2) digital manufacturing, (3) computational materials science and engineering, or other research areas that enable strong collaborations.

Marginal Probability Density Function of Stochastic Process

I was solving the following question and I derived the Auto correlation function and proved that it is a WSS process. However, I am not sure how to go about finding the Marginal probability density function. Should I find joint probability of a and b and then find marginal probability of each random variable?

Limitations of using Reliability, Availability & Maintainability software applications for engineering asset management

Does anyone have experience in using RAMs software applications?

I am working on a paper that looks at the limitations of managing risk and improving reliability of engineering assets by using RAMs software applications but I have no experience in using any RAMs software application.

Carnegie Mellon University Department of Civil and Environmental Engineering

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