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      Hi, I have used langrangian framwork proposed by Needleman in 1994 to model materials' failure under compression. In this model cohesive elements were inserted along solid elements boundary.

hi all,

i am working on abaqus and using umat subroutine.

after i wrote a simple example code(isotropic) on fortran language and make a model on abaqus, i tried to run it together. it is worked.

after, i changed the simple code to my own code(anisotropic code) and run it with abaqus. i 

the result  is following:

too many increment made for this increment.

for step 1 converge but not step2 step 3 step4.

I tried to reduce the time increment but not way even the mesh i changed.

the time step i used is dynamic implcit

A postdoc position is available in the Computational Mechanics Lab at the University of Texas at Dallas. The research will focus on high-performance computing application in the general field of computational mechanics. The potential candidate shall have a Ph.D. degree in mechanics, mechanical engineering and related areas with emphasis on computation and simulation and integration with experiments. The project will involve extensive programming on HPC platforms.

PhD position(s) are available for Spring 2016 semester to perform theoretical and computational work on phase field modeling of variaous structural changes in engineering materials and modeling of interaction between phase transformations and plasticity. MS degree and background in continuum and computational mechanics is required. Please send vita to Prof. Valery Levitas (vlevitas [at] iastate.edu (vlevitas[at]iastate[dot]edu)).

Info about Prof. Levitas group can be found at

For some educational purposes, I need a 2D Dislocation Dynamics Matlab Code. Where can I get it?

For some educational purposes, I need a 2D Dislocation Dynamics Matlab Code. How can I find it?

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