# large deformation

## Large Deformation - Definition of total work energy density

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Like we have the elastic strain energy density for small deformations  defined as 0.5* σ :e  .

Is the equation PK2:E valid for the total work energy density for elastoplastic regimes ? If not, what would be a valid equation for total energy density ?

How can we decompose total work density into elastic work and plastic work densities for a large deformation case.

Where,

PK2 is the second piola kirchoff stress tensor

E is the Green-Lagrange strain tensor

Thanks,

Prithivi

## Elastica arm scale

Can configurational forces be exploited to design a new type of scale?

See the explanation and an example of use at http://www.ing.unitn.it/~bigoni/elasticscale.html

## How to get the update the local material coordinate in large deformation for hyperelasitc rubber-like materials?

Hello,

I want to ask things about the updation of local material coordinate in large deformation.

Does there exist two ways for this?

1. Polar decomposition of Gradient Deformation Tensor F to get the rotation tensor.

2. Update each basis vector of local material coordinate system using modified Gradient Deformation Tensor F_bar = F*J^(-1/3).

## Harnessing snap-through instability in soft dielectrics to achieve giant voltage-triggered deformation

For a dielectric elastomer membrane we show giant voltage-triggered expansion of area by 1692%, far beyond the largest values reported in the literature.

## Cardboard rolls on the nanoscale

Everybody knows that cardboard paper can be a highly
anisotropic material. You can easily bend or roll it in one direction
and it is stiff in the other. If you take a close look you will find
that the paper is periodically buckled along one direction. We have now
exploited this phenomenon on the nanoscale to define the roll-up
direction of ultra-thin membranes on a substrate surface.

## Disparity in Simple Shear solution in ABAQUS

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Dear All,

## Boundary conditions in corner nodes

Hello Dear

I have a problem about informing boundary conditions of a CFFF plate. How can I inform the boundary conditions of corner nodes?

With best wishes