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Hi everybody,




I'm working on UEL. The stiffness matrix (AMATRX) which I have
defined is consisting of complex numbers (real and imaginary part).


When I'm running it I'm getting this error message:




Abaqus Error: The executable standard.exe aborted with system
error code 1073741819. Please check the .dat, .msg and .sta files for
error messages if the files exist. ...




I checked the files and no error message was found.


When stiffness matrix is just real numbers, it's working perfectly.

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Earth science: Missing link in mantle dynamics

 http://www.nature.com/nature/journal/v507/n7490/full/nature13064.html

 Disclinations provide the missing mechanism for deforming olivine-rich rocks in the mantle

 http://www.nature.com/nature/journal/v507/n7490/full/nature13043.html

Abstract: 

Hello all,

I want to simulate loading of 2D RVE of dual phase steels, by giving individual phases properties, to get homogenised mechanical properties like yield strength,  % elongation etc, using micromechanics based approach. Litterature shows people have used two kinds of boundary condition viz. Periodic boundary condition and homogenous boundary condition for this case. My doubt is two folds:

1) What is the theoretical difference between these two kinds of boundary conditions? 

I am modelling a very simple 2D contact problem between a rigid indenter and a deformable squared-shape specimen. I used a implicit function f to describe the rigid indenter. 

The contact condition is: Inside the contact zone of the deformable specimen, a node n is outside of rigid indenter for f(n)>0, and inside for f(n)<0. In case f(n)=0, the contacting node lies on the surface of the rigid body.