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PostDoc position, Karlsruhe (Germany): Mechanics of Granular Materials in Fusion Technology

Submitted by Yixiang Gan on
job
fusion
job
postdoc
granular materials

A research position is now opening in the field of Computational Mechanics of granular materials, in Karlsruhe Institute of Technology (KIT), Germany. This position should start between May and September 2010, and is a full-time fixed-term PostDoc position for 2 years (TVL E13).



Writing User Subroutines with ABAQUS

Submitted by Ahmad Rafsanjani on
education
stress
strain
Plasticity
ABAQUS
elasticity
hyperelasticity
User subroutines in ABAQUS
UMAT
VUMAT
Neo-Hookean
Kinematic Hardening

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

Postdoctoral Research Associate at University of Sydney

Submitted by Luming Shen on
job
A Postdoctoral Research Associate position is available in the School of Civil Engineering at the University of Sydney, Australia. The  project aims to understand the effects of solid solute, grain size and intermetallic structure on the strength of Mg alloys through modelling and simulation. The project is funded by the Australian Research Council (ARC) Centre of Excellence (CoE) for Design in Light Metals.

Stretching and Spin Tensors Relations

Submitted by Hamad on
education

Can someone help me to understand this please:

The stretching tensor (D) is the symmetric part of the velocity gradient (L), and if I derive D from L with using the polar decomposition of the deformation gradient (F=RU) I get the relation:

D=0.5 R (Udot Uinv + Uinv Udot) R' ----(Eq.1) where Udot is the time derivative of U, Uinv is the inverse of U, and the prime indicates the tranpose of the matrix.

TECHNOLOGY LEADER (CENTRE DIRECTOR)

Submitted by Deirdre_Murphy on
job

TECHNOLOGY LEADER (CENTRE DIRECTOR) 

Competence Centre for Composite Materials 

A Competence Centre for composite materials research is to be established at UL, with support from Enterprise Ireland and IDA Ireland. The Centre will conduct innovative, high quality research in the use of composite materials with direct relevance to industry.  Applications are invited for the position of Technology Leader (Centre Director) 

difference between elastic limit and proportional limit

Submitted by sagar_009 on

hi all,

can anyone explain about the following basic questions

1. me the difference between the proportional limit and elastic limit.

   Please dont give the definitions of both, i need some detailed explaination.

 2. How many natural frequency a object can have?

Regards

sagar

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