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Symposium on Multi-physics of Materials and Interfaces @ USNCTAM 2010

Submitted by Aman Haque on

Dear Colleagues:

As a part of the 16th US National Congress of Theoretical and Applied Mechanics conference (from June 27 to July 2, 2010 at Penn State University), we are organizing a symposium on the multi-physics, or the coupling among physical domains (thermal, electrical, mechanical, magnetic, optical, chemical to name a few).

A Geometric Theory of Thermal Stresses

Submitted by arash_yavari on

In this paper we formulate a geometric theory of thermal stresses.

Given a temperature distribution, we associate a Riemannian

material manifold to the body, with a metric that explicitly

depends on the temperature distribution. A change of temperature

corresponds to a change of the material metric. In this sense, a

temperature change is a concrete example of the so-called

referential evolutions. We also make a concrete connection between

our geometric point of view and the multiplicative decomposition

Moving Heat Source in Gmaw

Submitted by PATELAM on

Dear Sir/Madam,

       

i m quite new wd the ansys and was trying to simulate a problem of moving heat source in GMAW and has to move wd some Heat flux on  the plate .how could i model heat distribution of the GMAW and how could i move it wd some velocity.. 

i hope i m clear,plz help me out.

 Thank You,

Amrat Patel

patel_am [at] yahoo.com (patel_am[at]yahoo[dot]com)

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

Submitted by cece83 on

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.