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Charge localization instability in a highly deformable dielectric elastomer

Submitted by tongqing.lu on
research
electromechanical instability
dielectric elastomer
localization

A highly deformable capacitor made of a soft dielectric and two conformal

electrodes can switch between two states discontinuously, by a first-order transition, as the total

charge varies gradually. When the total charge is small, it spreads evenly over the area of the

capacitor, and the capacitor deforms homogeneously. When the total charge is large, it localizes in

a small region of the capacitor, and this region thins down preferentially. The capacitor will

Why am I getting a messy signal FFT instead of a smooth one?

Submitted by r_1159 on
research

Hi

I am doing wave simulation on plates with various damages. Guided sinusoidal waves are generated and scattered throughout the plate. To compare the results I am getting FFt of displacement (frequency domain). The one without damage gives me a very smooth FFT while the ones with damage give me a messy FFT ( Please see the attached photo). Is it something to do with filtering or is any thing wrong with my results ?

 

Damages model

http://oi42.tinypic.com/zo6ty9.jpg



Undamaged model

modelling and analysing the laminated composite using ansys

Submitted by S.NARAYANAN on
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laminated composites
stacked composites

I want to do research work in analysing composite using the ansys or similar software.I want to get the details regarding modelling the laminated composites.

And also details regarding  analsing the properties of composite for cyclic load,fatique load,and torsion.

which ansys version is suitable

 

 

Dynamic Brittle Fracture as a Small Horizon Limit of Peridynamics

Submitted by Robert Lipton on
research
dynamic fracture

Overview: The peridynamic formulation is a
spatially nonlocal derivative free model for simulating problems of free crack
propagation.Material points interact through short-range forces and the
formulation allows for discontinuous deformations. Here the short-range forces
are initially elastic and soften beyond a critical relative displacement. We
upscale this peridynamic model to find the macroscopic (a.k.a. small horizon)
limit. It is shown that the limiting macroscopic evolution has bounded energy
given by the bulk and surface energies of brittle fracture mechanics. The
macroscopic evolution corresponds to the simultaneous evolution
of the fracture surface and linear elastic displacement away from the crack

Curvature effect on nitinol aortic stent

Submitted by ankur2626 on
research
ABAQUS
Nitinol
curvature
aotic stent

high i am a student doing a project on curvature effect on thoracic stent. I want to curve the nitinol stent in abaqus. I am using RSURFU and doing static analysis. But am not able to curve it. Also when using implicit dynamic analysis with quasi static apllication my KE is high and comparable to IE. So can any body help me. Crimping and expansion is not a problem.

 

J integrale evalution on Abaqus

Submitted by Brick chaouche Amine on
research
fracture mechanics

Good mourning, i am using Abaqus software to inverstigate a crack propagation problem using Abaqus, in this regards i have created a seam crack iner the geometrie which is a plate  under a plane stress condition, my problem is how to mesh around the crack tip in order to have a regular mesh around the crack tip so i can evaluate J integral for multiple contours, the Abaqus documentation mention the swept meshing technique but i coudn't find something about a 2D problem since the sweapt meshing technique nead to mesh a section and swept it over the rest of the body, and in 2d problem we

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