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Swell induced surface instability of confined hydrogel layers

Submitted by Rui Huang on
research
R. Huang Group Research
hydrogel
surface instability
soft materials

A previous work suggested a critical condition to form surface creases in elastomers and gels. For elastomers, the critical condition seems to have closed a gap between experimental observations (e.g., by bending a rubber block) and the classical instability analysis by Biot. For gels, however, experiments have observed a wide range of critical swelling ratios, from around 2 to 3.7. Here we present a linear perturbation analysis for swollen hydrogels confined on a rigid substrate, which predicts critical swelling ratios in a similar range.

Gordon Research Conference - Thin Film and Small-Scale Mechanical Behavior - Registration is open

Submitted by Oliver Kraft on
conference
Gordon Research Conference

PRELIMINARY PROGRAM - Registration is open

Thin Film and Small-Scale Mechanical Behavior

July 25 - 30, 2010 at Colby College, Waterville, Maine

Online Application:

http://www.grc.org/application.aspx?id=9398

Preliminary Program:

Crack-tip field

Submitted by Zhigang Suo on
fracture mechanics
ES 247
Spring 2010

These notes were initially written when I taught fracture mechanics in spring 2010.  The title of the notes was then "stress intensity factor".  In revising the notes for the class in 2014, I have changed the title of the notes to "crack-tip field".

You can access all notes for the course on fracture mechanics. 

 

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.

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