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Hyperelasticity - traction boundary condition

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Zem

Mechanical
Joined
Mar 29, 2005
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9
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CA
I am trying to run nonlinear analysis (hyperelasticity) in Abaqus under uniform traction boundary conditions. I need to find the maximum extension I can get using Abaqus for this type of problem.

I found that Abaqus can handle this problem till some specific value of the pressure magnitude and then the analysis fails. It is a purely elastic problem. I consider a simple homogeneous rectangular plate, made of neo-hookean type material, subjected to loads from both sides and constrained from rigid body motion on the corners (plane stress). I tried almost everything: using controls, defining other types of boundary conditions, adjusting increment step – nothing works. Under displacement boundary condition there is no limit – analysis completes successfully for any displacement applied, whereas under traction boundary condition the maximum extension I can get is around 1% of the plate length, which is unacceptable for my research.

Is there any bug Abaqus has for nonlinear problems of this type? Has someone tried to apply this type of boundary conditions in nonlinear analysis?
 
You've already posted this in the finite element forum.

corus
 
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