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Problems with numerical integration of discontinuous functions

Submitted by minhtran.1986.vn on
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Hi everybody,

 I am a very beginnerin doing research :-) and my topic is about "micro indentation analysis using continuum dislocation theory". I am applying high-order finite element method for this nonlinear problem.

Problems with numerical integration of discontinuous functions

Submitted by minhtran.1986.vn on

Hi everybody,

 I am a beginner in doing research :-) and my topic is about "Micro Indentation Analysis using Continuum Dislocation Theory". I am applying high-order finite element method for this nonlinear problem.

A review on multiscale methods for material modeling

Submitted by phunguyen on

Dear all,

Please find enclosed our paper which is published on Journal of Multiscale Modelling
Vol. 3, No. 4 (2011) 1–42 which gives an overview of state of the art multiscale techniques for material modeling. 

The paper discusses the following topics: homogenization, Representative volume element, computational homogenization (Fe2 methods) for both both bulk materials and strong discontinuities. 

I hope the paper is useful for beginners to the field.

All the bests, 

How much rock compaction is elastic ?

Submitted by tlaverne on

Dear experts,

 

I was just wondering to what extent rock compaction was an elastic process. My guess is that there is a limit strain above which decompaction can't occur (for example if grain crush and cement in denser type of material). But in reality how much is that compaction elastic for real rocks ?

 

 

modelling the crack in Abaqus

Submitted by mahyar on

Hi colleage 

I am working on fracture mechanics recently and i am using Abaqus to do it, i am a new user in this software so i have some problems, in getting results and ... i want to get some variable such as J-integral, S.iF, number of cycles and ... but unfortunatelly i donno how to get it .

i want to ask if anybody can send me a sample of abaqus in this srea, then i can study and practise according to it and after that i can go through my project.

 

UMAT non-isothermal isotropic hardening

Submitted by atilim80 on
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Hi All,

I have a problem that I need to take in to account the elastic, thermal and plastic strains (with isotropic hardening). Temperature is changing and the corresponding material properties (elastic, plastic) are temperature dependent. This can be done in Abaqus without using subroutines. As I should add some other features I need to write an UMAT.

Double diffusive natural convection of CO2

Submitted by AkandIslam on

My recent simulation results http://www.youtube.com/watch?v=oyUNj7HEaro and http://www.youtube.com/watch?v=mEMrxHo_Z7s&feature=relmfu show how CO2 will dissolve in subsurface porous media after injection. The former results due to both density and geothermal gradients where the later is the results for only density difference.

-- Akand Islam 

Dynamic shear localization and softening: Microstructural, thermal or both?

Submitted by D.Rittel on

This basic question is discussed in a paper with S. Osovski and A. Venkert, to appear in Mechanics of Materials.

http://dx.doi.org/10.1016/j.mechmat.2012.09.008 

 We definitely enjoyed working on this aspect of the dynamic shear localization failure process (aka adiabatic shear) and I hope you will enjoy reading it! Comments are welcome :=)