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Stamp/Autofrettage

Stamp/Autofrettage

Stamp/Autofrettage

(OP)
I'm trying to model the process of performing a mechanical Autofrettage.

The thing is that I'm relatively new to ABAQUS and I'm getting numerous Warnings. These include:

The strain increment has exceeded fifty times the strain to cause first yield at 4 points
Excessive distortion at a total of 7 integration points in solid (continuum) elements
Convergence judged unlikely. Increment will be attempted again with a time increment of 1.19035e-02

I'm trying to do a quasistatic, dynamic, implicit analysis.
The stamp itself is modeled as an analytical rigid.
I created an Interaction (Surface Contact) between the (axisymmetric) solid and stamp, incorporating friction. The BC constraining/moving the stamp is set to a constant (vertical) velocity.

What could I do to improve the model and alleviate the warning messages/potential problems?

Thank you very much in advance!

RE: Stamp/Autofrettage

(OP)
My Dynamic/Implicit Loadstep is set to Quasi-static

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