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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.

ABAQUS bending moment diagram

Submitted by mahbub1669 on
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ABAQUS Bending moment diagram

Hi All

Can anybody let me know please, how to draw bending moment diagram using ABAQUS? I am fighting with this problem for a couple of days. I tried with the SF (SM1) variable but it does not give the value as I expected. Any help? Please.  Mahbub

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.

modeling corroded pipe with Abaqus

Submitted by badr on
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Fracture Mechanics Forum
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Hello everyone,

 I'm doing a 3D modelingcorroded pipe.  The results is differant from the Analytical solution (modified N31G mathod).  Abaqus results is actualy half of the analytical solution.

I need some help whith:

1-  Half of the pipe was modeld so, how should i constrain the pipe? I constrained it as in the attached picture.

2- How can i know how much load was applyed?

3- how can i magnifiy teh displacment?

 

Thank you,

Badr

 

 

 

Help regarding 2D co-rotational beam formulation

Submitted by yawlou on
research
beams
co-rotational

I have implemented a 2D co-rotational truss formulation in matlab.  I get identical results to OpenSEES.

Now I'm trying to implement a 2D co-rotational beam formulation.  I have followed the simple formulation in Crisfield's book volume 1.  It seems like this should be a fairly straight forward extension of the truss formulation.  I have rederived everything Crisfield has done and obtained the same results, yet something is still incorrect.

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