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advice to understand the Gurson Model

Submitted by jingzheng on
Forums
Ask iMechanica

Recently, I am studying on the Gurson Model, but it is a little bit hard for me to understand most part in the paper 'Continuum Theory of Ductile Rupture by Void Nucleation and Growth', I don't know about the spirit of deduction of formulas and some keywords make me confused, like 'convexity'and 'normality','loci',many....

It may be helpful if someone who is highly understand better about Gurson can introduce me some references maybe basic or middle hard, Thanks! 

fatigue

Submitted by sowmya on
Forums
Ask iMechanica

Is it possible to find out the number of cycles to failure for a composite material(glass-epoxy) in ansys,with the data known only for material properties,layup,fibre orientaion?The beam (i.e.solid 191 taken for analysis of composite) is to be considered to be given a displacment at one end.

KINDLY HELP ME OUT BY GIVING THE DETAILED PROCEDURE

Distinguished Professor Position, Zhejiang University

Submitted by Shaoxing Qu on
job

The School of Aeronautics and Astronautics of Zhejiang University invites applications for a full-time distinguished professor position in the field of solid mechanics.  The successful candidate should obtain an earned phd degree from world famous university, must have an excellent academic record, and currently takes full professor or comparative position in overseas world famous university or institute.

Multiscale Science Based-Modeling and Simulation and Experimental Validation on Enabling Materials, - Deadline March 1

Submitted by Anonymous (not verified) on
conference

On behalf of the NSF Summer Institute on Nanomechanics, Nanomaterials, andMicro/Nanomanufacturing, I am writing to remind you that the deadline for application for fellowships is March 1, 2009, for the short course entitled "Multiscale Science Based-Modeling and Simulation and Experimental Validation on Enabling Materials", to be offered from May 27 to May 30, 2009 in Evanston, Illinois.  The short course will first cover science-based modeling and simulation methods for general classes of enabling materials.

Hard stage materials in Ansys

Submitted by Michael Borowicz on
education
ansys

Hello,

I'm trying to simulate and compare principal stresses in model of bolt and nut, for different material data. I would like to get the soft/hard stage comparison. The problem is that I just do not know how to define hard stage material, it is not in standard material library in ansys (workbench or classic).

If anyone could help me giving some examples of hard stage materials data I would be greatfull.

Failure of protein materials in disease and other extreme conditions

Submitted by azadpoor on
research
failure
biomaterials
Protein

The recent issue of Nature Materials includes a review paper on the deformation and failure of protein materials in physiologically extreme conditions and disease. The paper was interesting, so I am posting the abstract here. For the full-paper visit Nature Materials.

UMAT: Calling a another subroutine in UMAT, Errors during job execution

Submitted by Andreas Burger on
UMAT
calling file from umat
errors

Hi,



I am in process of implementing the Bergstroem-Boyce Model. In a first
step I am just considering the hyperlastic part of it (Network A:
8-chain). I have implemented this part in a UMAT using a numerical
approach for the elasticity tensor (Forward Difference Approximation
with perturbation of F).



I have two problems:



1.

------------------------

In order to keep my UMAT as easy to read as possible I have tried to keep the FDA in a separate file using



call KFDA_Jaumann(dfgrd1,......)

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