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I have an idea: In abaqus, I want to simulate crack propagation by XFEM, and meanwhile I also want to define the stress update algorithm by writing a UMAT.
Anybody wants to share related experiences?

hi my friends,

i am using abaqus standard Mohr-Coloumb plasticity to model uniaxial compression test, so i have sample and (upper and lower platen) to represent the compression machine , i apply the load through the movement of the upper platen, the stress strain diagram of my material is strain softening.

The deadline for submitting abstracts has now been extended to 15 November. To submit, go to http://www.tc4pca.elsevier.com/abstractsubmission.asp

The Department of Mechanical and Industrial Engineering at the University of Minnesota Duluth has two post-doc openings in the areas of (1)Multifunctional nano materials/devices (2)Smart materials and structures. 

TO APPLY: Your complete application must include a cover letter, a curriculum vita, a one-page research plan, and contact information for three current references, which must be submitted online on the Employment System at:http://employment.umn.edu/applicants/Central?quickFind=91230

I wrote these notes about 10 years ago to supplement a course of lectures at Ecole Polytechnique.  There might be errors in the notes, but I hope they can help you learn this fascinating subject of lasting value. 

(Journal of Elasticity, Carlson memorial Volume)

A methodology is devised to utilize the statistical mechanical entropy of an isolated, constrained atomistic system to define the dissipative driving-force and energetic fields in continuum thermomechanics. A thermodynamic model of dislocation mechanics is discussed. One outcome is a definition for the mesoscale back-stress tensor and the symmetric, polar dislocation density-dependent, Cauchy stress tensor from atomistic ingredients.

The Institute of Structural Analysis (ISD) of Leibniz Universität Hannover organizes the ECCOMAS Thematic Conference on the Mechanical Response of Composites, from 21st - 23rd September 2011, in cooperation with the Graduate School on Multiscale Methods for Interface Coupling (MUSIC) of Leibniz Universität Hannover, the German Aerospace Center (DLR), and REpower Systems AG.