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Tsai-Wu FC

Submitted by Dimadima on

Good evening,

in the order to perfom a calculation of Tsai-Wu Fc in Ansys there are two fundamentally different methods:

1. with the help of nodal stresses.

2. or with the stresses from the element table.

I want to know what is the difference, and which method, according to your experience is the best.

Thank you very much!

Umat-Help-Progressive Damage modeling

Submitted by rajeshkatta on

Hiii All,

 I am writing an umat for Progressive Damage modeling for 3d Composites.

  when I am compiling my Umat i got an error which says

The executable /raid/software/64/abaqus/6.8-1/exec/standard.exe

aborted with system error "Illegal floating point operation" (signal 8).

I checked out my code many times but i dont find any wrong,Can any one please help me out to resolve this issue.

If some one needs my subroutine file i can send it to them provided te email address

Twitter and iMechanica

Submitted by MichelleLOyen on

How many iMechanica users are on Twitter?  And how many are on Twitter with professional contacts? 

 I started to use Twitter about 4 months ago in a completely social, non-professional context.  As a personal (expat-focussed) blogger, I started to notice that I was
catching blog posts in my Twitter feed before I would see them in my
feed aggregator (Bloglines).   Twitter has emerged as a different sort
of feed aggregator, as well as a provider of information. 

Plasticity and elasticity questions

Submitted by hiader k. mahbes on
 Dear All
I has question about these stresses.
1.Are deviatoric stress generate plastic deformation?
2. Are hydrostatic stress generate plastic deformation?
3.What is the advantage of transferring strain tenser orientation to the principle coordinate axes? 
4. What is the difference between rupture and fracture stress?

Particle size and debonding stress

Submitted by CeciliaPisano on

Hi everybody,

do you know where I can find some informations about the relation

between particle size and critical normal stress at the interface particle /matrix

for a particle embedded in a matrix?

I read the Chen's article 'Size effect of particles on the damage dissipation in nanocomposites'

but this article deals with spherical particles. I am studying clay/matrix nanocomposites and I would like to

calculate the relation between clay size and debonding stress.

Cecilia