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Coupled Temp-displacement Convergence problem

Coupled Temp-displacement Convergence problem

Coupled Temp-displacement Convergence problem

(OP)
Hello,

I m analyzing the rapid cooling (about 700C°C/s) of steel plate (thickness 1mm) in Abaqus/Standard.

I have same convergence problem like :

***ISOTROPIC HARDENING PLASTICITY DID NOT CONVERGE FOR ELEMENT PLATE-1
***THE SYSTEM MATRIX HAS 6 NEGATIVE EIGENVALUES

I tried
  • - reduce the size of mesh
  • - use automatic stabilization (damping factory)
  • - dashpots

but i can't have total convergence. What else can I try to eliminate convergences problems?

RE: Coupled Temp-displacement Convergence problem

Negative eigenvalues usually means it's not restrained properly. In addition, for rapid cooling use a very small time step and refine the mesh towards the surface where the temperature change is greatest.

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