Seeking Advice on Eigenstrain Implementation and Convergence Problems in DAMASK

[cjyehnycu]

Dear Sir/Madam,

I have been using DAMASK to investigate the compressive behavior of aluminum alloys subjected to different thermo-mechanical processing routes. While comparing the simulation results with experimental observations, I found that the predicted pole figures are sometimes significantly different from those obtained experimentally.

Based on the examples provided on the official DAMASK website, I attempted to incorporate eigenstrain into my crystal plasticity model in order to account for the effects of dispersed particles. However, after introducing the eigenstrain field, the numerical simulation repeatedly failed to converge and eventually diverged.

I would greatly appreciate it if anyone could provide a demonstration example or practical guidance on how eigenstrain should be properly implemented in DAMASK. In particular, I am interested in understanding the recommended procedure, parameter settings, and any potential numerical issues that should be considered when modeling particle-induced eigenstrains.

Thank you very much for your time and assistance.

The following part shows the output message and the corresponding material.yaml file.

material.yaml

Best regards,
Yeh

[hyharry]

hi, u can check the example in our test. normally u need to follow a procedure to solve Eshelby problem, namely after applying eigenstrain, one has to relax the microstructure without loading.

[cjyehnycu]

Thank you very much! This example was extremely helpful and clarified the correct procedure for me. I really appreciate your guidance.