Implicit and Explicit finite element method
i am not clear about implicit and explicit FEM
kindly let me know the difference of two and where to use which one
Help modeling a viscoelastic material in Abaqus
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Hello,
I'm trying to model indentation of a viscoelastic material in Abaqus.
I have (1) stress-relaxation curves for the material and (2) force-displacement curves for the material from a real indentation experiment.
From this I can readily calculate the elastic modulus (infinite) and the elastic modulus (instantaneous) for the material.
I'd like to fit a Prony series based on this data that I can enter into Abaqus to model the material.
How would I go about fitting the Prony series from the force-displacement and stress-relaxation curves?
Open PhD position at Mines ParisTech, Centre des Matériaux, Paris, France
Simulation of crack bifurcation in single crystal nickel base superalloys under mixed mode conditions
PhD position available at the Centre des Matériaux , ParisTech , starting fall 2009.
This 3-year project is fully funded by Mines ParisTech, SNECMA and ONERA.
A question about deformation gradient in ABAQUS user subroutine VUMAT
I have a question about deformation gradient in VUMAT.
When I use one element, Vumat works well and there is no any problem. Initially, only the diagonal part of deformation gradient is one, the others are zero. However, the problem is when several elements are considered, all the components of deformaiton gradient are equal to one at very beginning.
Stress intensity factors for a slanted crack under compression
Hello everyone,
Here is the problem I have: I'm modeling the geometry of a simple straight edge crack in a 2D elastic medium using Abaqus. I assume plain stress conditions. The crack makes an angle with the horizontal, is small enough to be considered as embedded in an infinite domain (ratio crack length/size of domain < 1/10) and I apply a vertical compressive load on top of my domain. I fixed one point in displacement at the bottom of it and the whole bottom edge is constrained not to move vertically.
composite material data
hi, i want yield stress and plastic strain data for aluminium and epoxy resin.actually i m doing project on composites.....
Genetic algorithm for function optimization with Matlab
Hi, Matlab experts !
Did someone work with Prof. Houck's paper (A genetic algorithm for function optimization: A Matlab implementation, 1995) on the genetic algorithm ?.
In his paper he proposes 3 online tutorials (gademo1.m; gademo2.m; gademo3.m) for working with the function "ga" in Matlab but it's all for Matlab 5. This function syntax has changed considerabily in Matlab 7. The key point is that we cannot define "bounds" which is a matrix of upper and lower bounds on the variables with Matlab 7.
So how Matlab 7 deals with this problem ?
Finite Element Analysis of Thermo-Viscoelastic Problem
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Hi,
I am trying to develop a finite element code to capture the residual stresses during the cooling of a viscoelastic body.
Can anyone suggest references or papers that address the finite element formulation of a thermoviscoelastic problem? I have found a couple of papers, but they do not seem to directly apply to what I want.
Thanks,
Shriram
Research Assistant
University of Florida
bifurcation buckling using ABAQUS
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The following is taken from the book Concepts and applications of Finite element methods by Cook, Malkus and Plesha.
For bifurcation buckling, we have the following eigenvalue problem:
(K+Lambda Ksigma)delta d= 0
Three postdoctoral positions at Lawrence Livermore National Laboratory
The Computational Physics group in the Atmospheric, Earth, and Energy Division at the Lawrence Livermore National Laboratory (LLNL) is solicitating applications for three postdoctoral appointments in the following areas. To access the full description and application instructions, please visit http://jobs.llnl.gov and search for the job numbers below:
008351: geomechanics of fluid-induced fault activation
008374: dynamic impacts into granular materials
008375: mechanics of dynamic impact and penetration into ceramics