I have a question regarding the experimental determination of rate independent phenomenological elaso plastic constitutive model.

Since the models are rate independent, does the strain rate in the experiments used to calibrate the model parametes have any influence on the model. I am talking about this in context to the Cap plasticity model used in Abaqus. One has to run a certain number of powder compaction experiments to calibrate the model.

I have a fundamental question regarding flow rules of finite plasticity models especially those used in soil mechanics. In most of the papers and books, I have seen the usage of an associated flow rule with the plastic potential similar to the yield surface. However, I am unable to understand the means of obtaining a non-associative flow rule. I am using Abaqus with cap plasticity model (modified Drucker Prager Cap model) to simulate powder compaction process.

Research on multiscale stochastic modeling is becoming big. In this article "A Green-function-based multiscale method for uncertainty quantification of finite body random heterogeneous materials"  doi:10.1016/j.compstruc.2009.05.009 , one of the first multiscale stochastic methods is developed for solid mechanics applications.....    

For a flexible electronic device integrating inorganic materials on a polymer substrate, the polymer can deform substantially, but the inorganic materials usually fracture at small strains.  This paper describes an approach to make such a device highly stretchable.  A polyimide substrate is first coated with a thin layer of an elastomer, on top of which SiN_x islands are fabricated.  When the substrate is stretched to a large strain, the SiN_x islands remain intact.  Calculations confirm that the elastomer reduces the strain in the S

A postdoctoral research fellow position is currently open in the Computational Nanomechanics group at the University of Pittsburgh for the following research projects in the multidisciplinary areas of computational nanomechanics, nanotechnology, renewable energy, and nanomedicine: 

1. Hydrogen and bio-sensing nanowire fabrication

I am currently seeking for Chinese PhD applicants (now residing in Mainland, China) to work in the experimental characterisation and numerical modelling areas of nanomaterials/polymer nanocomposites at Department of Mechanical Engineering, Curtin University of Technology, Australia. Please see my departmental webpage for any further enquiry (http://mech.eng.curtin.edu.au/dong/index.cfm). The specific research projects can be discussed in contact for the joint research interests.

 dear everyone,

I want to ask if anyone deal with strain gradient proposed

by fleck eat. in 1994 and 1997, using subroutine in ABAQUS ?

Hi everybody,

I modeled a sheet metal forming process in which entire blank is partitioned into two regions (Central and exterior regions). Forming tool is considered as a 3D-Analytical rigid body (Revolved Shell) and partitioned into two regions too. According to this process, the head of punch should be tied to the central region of the blank and punch's walls should contact with exterior region.

In interaction module, I can’t select defined regions on forming tool separately as the surfaces and I don’t know why the whole surface of the punch is selected?