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Electromechanical deformation of dielectric elastomer in two types of pre-stretch

Submitted by Bo Li on
research

A pre-stretched dielectric elastomer is capable of large deformation, when subject to voltage. This paper investigates the effect of two types of pre-stretch: by strain and by stress. The difference is compared and discussed using thermodynamics models. The significance of the pre-stretch in actuation is explained by examining the true stress in actuation. Under both pre-stretch strategies, during the actuation, the dielectric elastomer exhibits hysteresis loops due to snap-through but differs in shape and physical quantity.

Plasticity integration: satisfaction of the consistency requirement

Submitted by Weijie Liu on
research
return mapping
Plasticity
consistency requirement

Dear all,

I am trying to formulate the return mapping algorithm with Hill48 yield condition, isotropic hardening law and flow rule referenced to Simo & Hughes (Computational Inelasticity).

In section 2.2.2.1, equation (2.2.9) expresses the Kuhn-Tucker complementarity conditions:

In addition to conditions (2.2.9),   satisfies the consistency requirement:

Shape memory effect and pseudoelasticity behavior in tetragonal zirconia polycrystals: A phase field study

Submitted by mohsenzaeem on
research
phase field model
Zirconia
Martenistic Phase Transformation
Shape Memory Effect

Shape memory effect and pseudoelasticity behavior in tetragonal zirconia polycrystals: A phase field study, International Journal of Plasticity 60 (2014) 71–86. Martensitic tetragonal-to-monoclinic transformation in zirconia is a ‘‘double-edged sword’’, enabling transformation toughening or shape memory effects in favorable cases, but also cracks and phase degradation in undesirable scenarios.

Numerical approximation of tangent moduli

Submitted by Ravi Kiran on
research
tangent moduli
numerical approximation
elasticity
Plasticity
ABAQUS UMAT

 

In this study, we presented a numerically robust procedure to evaluate 4th order tangent moduli which are vital for acheiving quadratic convergence of global Newton-Raphson scheme.

In this study, the proposed method is verified for hyperelastic models alone. However, the same can be extended to other constitutive models.

The paper can be found at

Numerically approximated Cauchy integral (NACI) for implementation of constitutive models

10.1016/j.finel.2014.05.016

How to study a inverse problem? Know the orbit, solve the constraint condition.

Submitted by pcmagic on
research
inverse problem
solve the constraint condition
analytical mechanic
analytical method

Dear all,

Now I face a noval problem, and I do not know how to deal with it, even cannot begin the first step.

As we know, the formulation of a classical mechanical question  is given the initial condition and the constraint condition, and solve the unknown orbit. Now I face a inverse problem. I know the initial condition and the orbit, and would like to solve the unknown constraint condition.

Is there anyone could give some seggestion, I don't know how to do it. Thanks.

Best. 

Selection of element bsed on the location in abaqus using python script.

Submitted by rajesh2902 on
research
finite element analysis
ABAQUS
Python

Hi

I'm facing problem while writing a script for a parametric study.

After changing the each parameter the model changes and and the loaction of the interested element changes based on those parameters.

Also the element number changes.

Is there any command in python script to choose the elements based on the location ? 





Thank you in advance



Rajesh Kumar

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