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large deformation

ANSYS Modelling 3D Surface-to-surface Contact, need help

Submitted by pday on
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I am fairly new to ANSYS and have been trying to model the interaction between glass micro-spheres and silicone polymer micro-structures for my dissertation research.  I've been working through the online manual, but have been getting very odd results when running the simulation.  Any help at all would be appreciated.  The summary of my problem is as follows:

 Modelling:

ALE (Arbitrary Lagrangian-Eulerian) mesh adaptivity in ABAQUS/Standard

Submitted by Youssefans on
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Dears,

 I'm doing some numerical analysis on penetration of infra-strucutres on soils (such as CPT tests) in ABAQUS/CAE .. what I'm recently challenging with is to overcome the element excessive distorsion due to large deformations... I have to apply contact constraints in my model...I would appreciate it if you share your expriences with me regarding the following tips:

1- Is it possible to use the ALE (Arbitrary Lagrangian-Eulerian) mesh adaptivity in ABAQUS/Standard? If yes, do you know of any accessible examples (.cae files) or references?

Fluid-structure Interaction in Cell Mechanics

Submitted by ADINA Support on

We present an application of fluid-structure interaction analysis to the mechanics of red blood cells. For more information see the following link:

http://www.adina.com/newsgH60.shtml

Please recall that we offer a special academic package, for research and teaching, for university users. For more information see:



http://www.adina.com/educ.shtml

Bending and wrinkling as competing relaxation pathways for strained free-hanging films

Submitted by Peter Cendula on

A thin film subject to compressive strain can either bend (for large strain gradient) or wrinkle (for small strain gradient). The bending is traditionally used in thermostats (bimetal stripes), but couple of years ago, it was extended to the nanoscale thin films which can bend and roll-up to tubes with defined number of rotations. The wrinkles are also rather common in macro- and microscale thin films.
Here, we developed an equilibrium phase diagram for the shape of
compressively strained free-hanging films by total strain energy
minimization.

Large deformation and electrochemistry of polyelectrolyte gels

Submitted by Wei Hong on

Immersed in an ionic solution, a network of polyelectrolyte polymers imbibes the solution and swells, resulting in a polyelectrolyte gel. The swelling is reversible, and is regulated by ionic concentrations, mechanical forces, and electric potentials. This paper develops a field theory to couple large deformation and electrochemistry. A specific material model is described, including the effects of stretching the network, mixing the polymers with the solvent and ions, and polarizing the gel.

Details About "NLGEOM"Command in ANSYS

Submitted by shrimad on
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I am developing an FEA code for a viscoelastic contact analysis. Right now the formulation is assuming small deformations. After deformation I am getting the volume of the body to be less than the original. I want to preserve the volume. ANSYS gives exact results as my code by carrying a normal contact analysis.

A Ph.D.+MSc Position on Brain Surgery Simulation by XFEM and FleXFEM

Submitted by Stephane Bordas on

High Performance Computing MSc+Ph.D. position available at the University of Glasgow on Massively Parallel Brain Surgery Simulation with the extended finite element method (XFEM and FleXFEM)  (University of Glasgow) -- funding body is EPSRC.

One year MSc in HPC in Edinburgh (all costs covered by funding) + 3 year Ph.D.  and access to HecToR, one of the world's largest super-computer, including training with experts in massively parallel simulation (10,000+ processors).

PhD position available at LGP - ENIT - Tarbes - France

Submitted by Olivier Pantalé on

A PhD position is available for a thesis with SKF Aerospace France in the Laboratoire Génie de Production - Ecole Nationale d'Ingénieurs de Tarbes - France

Detailled subject (in French) can be found at : http://pantale.free.fr

Starting date October 2007

CV+letter can be send until September 8th 2007 to : Olivier.Pantale [at] enit.fr 

Propagation of instability in dielectric elastomers

Submitted by Jinxiong Zhou on

When an electric voltage is applied across the thickness of a thin layer of an dielectric elastomer, the layer reduces its thickness and expands its area. This electrically induced deformation can be rapid and large, and is potentially useful as soft actuators in diverse technologies. Recent experimental and theoretical studies have shown that, when the voltage exceeds some critical value, the homogenous deformation of the layer becomes unstable, and the layer deforms into a mixture of thin and thick regions.