Abaqus/Explicit

Dynamic simulations with nonlinear material into Explicit

Submitted by malbi on Fri, 05/14/2010 - 16:36

Hi all,

I am new in the Forum, and I am looking for some informations regarding how to simulate nonlinear material in explicit.

I am tryng to analyse the behaviour of a roller rolling on the sand (or mud), but the results I get with a basic elasto-plastic material are not very accurate, expecially because I cannot set the tension allowed in the sand to be zero.

Other ways to input nonlinearity in Explicit are always refused by ABAQUS. Is there any way to get something more accurate?

VUMAT for Nitinol --- why VUMAT and not UMAT?

Submitted by cece83 on Sat, 11/28/2009 - 12:53

Dear all,

I'm new in imechanica. I need some informations about VUMAT for Nitinol. I would like to implement in fortran a subroutine for the behaviour of shape memory alloy.I looked for some subroutines already implemented but they have been developed in the implicit way.

It's true that with the VUMAT(explicit) I could have some problems of stability and convergence.Could someone suggest me any reason to make this model in the VUMAT?I know that in VUMAT I can't redifine the time increment so before running the analysis It's important to pay attention on Dt.

Abaqus/Explicit VUMAT works fine on 32 bits Abaqus - Fails on 64 bits Abaqus with more than 1 processor!!!

Submitted by julienx2k2 on Thu, 06/11/2009 - 19:29

Hi,

Here is the issue:

I am working with a x64 version of
Abaqus/Explicit (6.8-2), and a 32bits version (6.7-1). MS VS2005 is
installed with the x64 compiler tools, Intel Fortran is correctly
installed (IA-32 and Intel64 versions). My OS is Windows Vista Enterprise (64 bits).
The routine is compiled and linked correctly by lauching the appropriate ifortvars.bat file prior to executing abaqus.

Everything works perfectly with the 32 bits version of Abaqus+Compiler, with one or more processors (I have 8 of them).

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