research

Electromechanical instability in semicrystalline polymers
Xuanhe Zhao , Zhigang Suo
Abstract

I am a bit confused about glass (silicate glass) material behvoiur. If it is viscoelastic how does it deforms? Does anyone knows any good reference?

 Thanks

Dear All,

I am new to simulations of carbon nanotubes, especially in their mechanical properties. My supposed tools are ab initio codes or md codes. I am looking for some references. Can someone introduce some classical papers or leading experts in this field.

Thanks.

A question has arised when I read a book about fracture mechanics recently.

This question is about the calculation of potential energy in "fixed-grips" (prescribed displacement) and "dead-load" (prescribed displacement).

Cloaking of matter waves under the global Aharonov-Bohm effect

Authors

De-Hone Lin and Pi-Gang Luan

Abstract

Dear Mechanical Engineers,

It's my pleasure to be one of your group. I have a question in Abaqus Explicit and all my friends recommended me to as iMechanica as the explicit Abaqus is more popular to you than us as civil engineers.

I’m trying to simulate a tensile test for an elastic-perfectly plastic material as a quasi-static analysis in Abaqus Explicit. I have solved the same problem in Abaqus Standard and the results were fine as follow.

This paper studies the dynamic behavior of a dielectric elastomer balloon subject to a combination of pressure and voltage.  When the pressure and voltage are static, the balloon may reach a state of equilibrium.  We determine the stability of the state of equilibrium, and calculate the natural frequency of the small-amplitude oscillation around the state of equilibrium.  When the voltage is sinusoidal, the balloon resonates at multiple frequencies of excitation, giving rise to superharmonic, harmonic, and subharmonic responses.  Whe

http://www.livescience.com/environment/090527-science-lives-andrade.html

LiveScience is a pretty cool initiative targeted to the general public,
specially the younger generations to communicate the impact and
value of science and the people around it.

Mechanical energy can be converted to electrical energy by using a dielectric elastomer generator.  The elastomer is susceptible to various modes of failure, including electrical breakdown, electromechanical instability, loss of tension, and rupture by stretch.  The modes of failure define a cycle of maximal energy that can be converted.  This cycle is represented on planes of work-conjugate coordinates, and may be used to guide the design of practical cycles.

I have a 3D model in Abaqus of a wind turbine rotor, modelled with shell elements (S4R and S3). To use the same blade in an aeroelastic wind turbine code (HAWC2 from Risoe), I want to convert selected cross sections of the 3D model to Timoshenko beam elements.

In a previous post some months ago (see here), I mentioned some of the questions I had considering the aeroelastic response of a wind turbine rotor. In this post I just want to give, for those interested, a brief status report.

I don't know if my understanding of the following is correct, so I would appreciate your comments. I have an expression for Gibbs free energy of a material G=G(σ,T,...). Is it correct to derive the equation for strain as ε=∂G/∂σ ?