Plasticity

A postdoctoral fellow is sought to study the mechanics of magnesium alloys at the University of Waterloo, Canada, under the guidance of Dr. Worswick and Dr. Gracie. The qualified applicant will have a proven background in computational mechanics, substantiated by publications in international journals.  Preference will be given to candidates with experience coding large deformation plasticity models, coding the finite element method and with using fracture mechanics.  In addition, experience with high strain rate testing of materials is desirable.

The Graduate School MUSIC ("Multiscale Methods for Interface Coupling") and the

Institute of Continuum Mechanics at Leibniz Universität Hannover invites

applications for a position as a

Research Staff Member in Computational Mechanics

(Salary scale E13 TV-L)

to be appointed on 1 April 2010.

The position is embedded into the Junior Research Group on „Multiscale Modelling of

Materials and Interfaces with Size Effects” and is initially limited to 1 year.

ijscs [at] mengr-tamu.org (International Journal of Structural Changes in Solids)

Mechanics and Applications

 An open access journal

ijscs [at] mengr-tamu.org (Volume 1 No.1, 2009 )

Dear All,

 I think that many students are looking for some tutorials about writing a UMAT in ABAQUS.

You can find a comprehensive tutorial for elastic problems.

This file contains: 

• Motivation

• Steps Required in Writing a UMAT or VUMAT

• UMAT Interface

• Examples

Example 1: UMAT for Isotropic Isothermal Elasticity

Example 2: UMAT for Non-Isothermal Elasticity

Example 3: UMAT for Neo-Hookean Hyperelasticity

Submitted to the Journal of Applied Mechanics on 2/1/2010. 

 (in Computational Methods for Microstructure-Property Relationships," Springer. Edited by Somnath Ghosh and Dennis Dimiduk)

Dislocation mediated continuum plasticity: case studies on modeling scale dependence, scale-invariance, and directionality of sharp yield-point

Claude Fressengeas, Amit Acharya, Armand Beaudoin

I am working with shape memory alloys (nitinol), and am in that respect investigating fracture behaviour of NiTi, using, among other things, simulations in ABAQUS. ABAQUS doesn't have a material model that include plasticity unless you pay for it. I am wondering if anyone have implemented either of the following models as a UMAT, and if you are willing to share the code with me.

The models I am interested in are: