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elastic-perfectly plastic diffusion problem

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Dear all,

I am simulating the diffusion induced stresses in a sphere. I did the simulation for elastic case (multiphysics structural module with pde) . Now as a next step i see the stresses are high and cause plastic deformation in some portion of sphere during diffusion.

Diffusion is time dependent where as plasticity model(elastic-perfectly plastic ) is static one. When i use time dependent solver it gives an error. How to capture this behavior?

Regards,
Meena

2 Replies Last Post Nov 25, 2015, 12:16 p.m. EST
Nagi Elabbasi Facebook Reality Labs

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Posted: 9 years ago Nov 24, 2015, 12:41 p.m. EST
Hi Meena,

Both stationary and transient solvers should work for elastic-plastic materials. However, one trick that helps sometimes when you have to solve a static structural problem as a transient one is to exclude inertia effects by setting Structural Transient Behavior to Quasi-static.

Nagi Elabbasi
Veryst Engineering
Hi Meena, Both stationary and transient solvers should work for elastic-plastic materials. However, one trick that helps sometimes when you have to solve a static structural problem as a transient one is to exclude inertia effects by setting Structural Transient Behavior to Quasi-static. Nagi Elabbasi Veryst Engineering

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Posted: 9 years ago Nov 25, 2015, 12:16 p.m. EST
Thank-you for the help!

system works for istropic hardening model but do not converge for elastic-perfect plastic model .
I set the direct solver setting to nonlinear newton still it fails to converge.

Any suggestion for resolving this issue?

Thanks,
regards,
Meena
Thank-you for the help! system works for istropic hardening model but do not converge for elastic-perfect plastic model . I set the direct solver setting to nonlinear newton still it fails to converge. Any suggestion for resolving this issue? Thanks, regards, Meena

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