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Lecturer in Computational Mechanics, Cardiff School of Engineering

mohammad hodaei's picture

Postdoctoral position

I ma looking for postdoctoral position in area of Contact Mechanics and Vibration.


Recent Review Paper on Advances in Mechanics—Isolation of circulating tumor cells under hydrodynamic loading using microfluidic technology

Journal Tittle: Advances in Mechanics

Article Tittle: Isolation of circulating tumor cells under hydrodynamic loading using microfluidic technology

Author: ZHAO Cong, LEE Yi-Kuen, XU Rui, LIANG Chun, LIU Dayu, MA Wei, PIYAWATTANAMETHA Wibool, ZOHAR Yitshak


uniUnit - unify system of units

In FEM and other similar simulation techniques, keeping consistent units is a tedious work and almost everyone made this kind of mistake one or two times. Therefore, here I propose a package for dealing with this problem once and for all.

The idea of the package is simple, you tell me what is the system of units you want. Then, tell me the correct number in any system of units. All is done! The package will try to print out the value in you specified system of units.

Here is some examples:

2D corotational beam

hello Dear friends

I am phd student in mechanical engineering. I want to compare field consistent total lagrangian 

and corotational formulation for geometrically nonlinear 2D beam analysis. I wrote

a code for total lagrangian approach and my results are exct but in corotational

I have some difficulties in coding. if someone has a sample corotational code please

contact with me.




Jamie Guest's picture

Symposium on Architected Materials at Mach 2015

We are pleased to announce the symposium "Design, Fabrication and Characterization of Architected Materials" at the upcoming 2015 Mach Conference (  A full description of the symposium is provided below. Abstracts are due December 5, though please let us know if you are interested in participating but need additional time to prepare the abstract. 

Jamie Guest, Johns Hopkins University
Lorenzo Valdevit, University of California, Irvine


I have VUMAT code for visco-plasticty material.

When I use this code for abaqus 6.10 input file it works fine.

If i create same problem(one element check) in abaqus 6.13 and run in cluster with abaqus 6.11 it is not working. 

Getting error like below.

***ERROR: Floating Point Exception detected in increment 2722.  Job exiting.


     2722  6.904E-03 6.904E-03  00:00:00 7.536E-04           0 NaN        NaN

ODB Field Frame Number      1 of    100 requested intervals at  6.903776E-03


ABAQUS - Jointed material model

Hello all:

I have bee trying to run the benchmarks problems, but for some reason I'm unable to obtain the expected results. I'm trying the built the strength envelope that is presented in the manual. The envelope defines different maximum axial stress depending on the orientation of the discontinuities with respect of the loading direction.


Abolhasan Giashi's picture

Rubber Adhesion Behaviour

Dear everyone

My project is about the adhesional friction between rubber and a rigid surface. In this case I have modeled a block of rubber which is sliding on a real rough rigid surface in ABAQUS.

akshay patil's picture

confusion between UMAT and UEL

My Masters thesis work is on fatigue crack growth analysis on microalloy steel using cohesive zone model for mode-I crack growth.I had seen papers
on cohesive zone model which is attached here,in that damage based cohesive model is implemented. I would like to know how can we implement
damage mechanisms in ABAQUS,means whether it is necessary to write UMAT​ or UEL for the same?
can any one give me some suggestions?
Looking forward to your reply.
thank you very much.

jiangyuli's picture

Washington Research Foundation Innovation Fellows Program in Clean Energy

We are pleased to announce the Washington Research Foundation Innovation Fellows Program in Clean Energy ( With the generous support of the WRF, we have been able to establish a competitive program that will help us recruit some of the most talented clean energy researchers to the UW.  Here are some of the program highlights:

Faculty Positions - Mechanical Engineering

Faculty Positions
Mechanical Engineering

The Physical Sciences and Engineering (PSE) Division at King Abdullah University of Science and Technology (KAUST) ( invites qualified applicants to apply for faculty positions at all ranks (Assistant, Associate and Full Professor) in the Mechanical Engineering program.

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?


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