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Journal Club Theme of March 2009: Mechanics Issues in Nanocapacitors and Ramifications for Energy Storage

Submitted by Pradeep Sharma on
research
thin films
dielectrics
nanocapacitors

Next generation advances in energy storage for nanoelectronics, micro and nanosensors among others, require capacitors fabricated at the nanoscale. High dielectric constant materials such as ferroelectrics are important candidates for those. Consider the following: the expected capacitance of a 2.7 nm SrTiO3 thin film is 1600 fFmicro-m-2. What is the likely value in reality? 258 fFmicrom-2! This dramatic drop in capacitance is attributed to the so-called "dead layer" effect.

Volume variation in filled and unfilled natural rubber : competition between cavitation and stress-induced crystallization

Submitted by LECAM on
research
elastomer
volume variation
stress-induced crystallization
cavitation

this is a study on the competition between cavitation and stress-induced crystallization during the deformation of cis-1,4 polyisoprene rubber. During deformation, this kind of material exhibits volume variation induced by both phenomena. In this study, we propose to measure this volume variation by an original full-field measurement technique. The high resolution of this technique allows us to identify characteristic stretch ratios during mechanical cycles.

Parametric modelling help!!!!!!!!!!!!!

Submitted by JayZ900807 on

Hiya.

I want to run example paramtrized input files on Abaqus. I do this by importing it as a model. However, when i do this, an error message comes up saying:

WARNING: The input file contains one or more data items which have been parameterized. Parameterized input files can not yet be imported into Abaqus/CAE. This occurred while scanning input file for parameterized data. The input file will not be imported.

I really need to overcome this problem. Is there anyone out there that can help?

Distinguished Professor Position, Zhejiang University

Submitted by Shaoxing Qu on
job

The School of Aeronautics and Astronautics of Zhejiang University invites applications for a full-time distinguished professor position in the field of solid mechanics.  The successful candidate should obtain an earned phd degree from world famous university, must have an excellent academic record, and currently takes full professor or comparative position in overseas world famous university or institute.

Multiscale Science Based-Modeling and Simulation and Experimental Validation on Enabling Materials, - Deadline March 1

Submitted by Anonymous (not verified) on
conference

On behalf of the NSF Summer Institute on Nanomechanics, Nanomaterials, andMicro/Nanomanufacturing, I am writing to remind you that the deadline for application for fellowships is March 1, 2009, for the short course entitled "Multiscale Science Based-Modeling and Simulation and Experimental Validation on Enabling Materials", to be offered from May 27 to May 30, 2009 in Evanston, Illinois.  The short course will first cover science-based modeling and simulation methods for general classes of enabling materials.

Hard stage materials in Ansys

Submitted by Michael Borowicz on
education
ansys

Hello,

I'm trying to simulate and compare principal stresses in model of bolt and nut, for different material data. I would like to get the soft/hard stage comparison. The problem is that I just do not know how to define hard stage material, it is not in standard material library in ansys (workbench or classic).

If anyone could help me giving some examples of hard stage materials data I would be greatfull.

Failure of protein materials in disease and other extreme conditions

Submitted by azadpoor on
research
failure
biomaterials
Protein

The recent issue of Nature Materials includes a review paper on the deformation and failure of protein materials in physiologically extreme conditions and disease. The paper was interesting, so I am posting the abstract here. For the full-paper visit Nature Materials.

UMAT: Calling a another subroutine in UMAT, Errors during job execution

Submitted by Andreas Burger on
UMAT
calling file from umat
errors

Hi,



I am in process of implementing the Bergstroem-Boyce Model. In a first
step I am just considering the hyperlastic part of it (Network A:
8-chain). I have implemented this part in a UMAT using a numerical
approach for the elasticity tensor (Forward Difference Approximation
with perturbation of F).



I have two problems:



1.

------------------------

In order to keep my UMAT as easy to read as possible I have tried to keep the FDA in a separate file using



call KFDA_Jaumann(dfgrd1,......)

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