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Entropic rigidity of a crumpling network in a randomly folded thin sheet

Submitted by Balankin on
research
Forced folding
Entropic elasticity

We have studied experimentally and theoretically the response of randomly folded hyperelastic and elastoplastic sheets on the uniaxial compression loading and the statistical properties of crumpling networks. The results of these studies reveal that the mechanical behavior of randomly folded sheets in the one-dimensional stress state is governed by the shape dependence of the crumpling network entropy.

elastic wave

Submitted by cocanouar on
research
Good morning,



I am a new member in your site, I do research on (the theory of propagation of elastic waves in the composite) with the theory of self consistent,
I seek PlZ of documentation on the theory of self consistent and if you can helped conceranat this subject.


thank you in advance

Could anyone help on Drucker-Prager model?

Submitted by Botao on
research
Plasticity
Drucker Prager model

I am using exponent Drucker-Prager model at the moment, is there anyone can tell me where the follow exponent D-P eqation comes from originally?

(σ e)(σ e)=λ(σt)(σt)-3(λ-1)σmσt

Where λ= is hydrostatic stress sensitivity parameter and equal to σc/σt, σe is effective stress, σm is hydrostatic stress, σc, σt are stresses under compression and tension, respectively.

Simple strategies to produce perfect long range order in self-assembly

Submitted by Pradeep Sharma on
research
self-assembly

In a recent rapid communication (see attached paper), using principles of pattern formation, we expose some simple stategies to reliably produce perfect long range order in self-assembling systems. Most self-assembling systems exhibit short ranged order. This imperfection is detrimental to several practical applications. It is almost always possible to produce perfect patterns in small domain sizes but self-assembly over a larger areal span results in defects.

Composite analysis using SHELL99

Submitted by nadderdolatabadi on
research

I'm trying to model a composite structure with shell 99 element in Ansys.

I set the thickness and material no. in real constant and prepare an orthotropic material property for that. While ploting the result, as I expect to get the stresses among layers different from other points, but the result is a kind of uniform isotropic graph.

I don't know if any setting other than real constant and material property should be done to get a true result or not. and if I'm true then how can I read the true result.

I will appreciate any help.

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