I also tried to use IMFLAG in CONTROL IMPLICIT GENERAL to switch the solver in ls-dyna.
To my deep regret, I was not able to successfully use this way of solving the problem.
Below is the error message and the file for this problem
Maybe there are errors in this model
https://drive.google.com/file/d/1bZzXNf7NOmcYYPBtF5iGxSeKR2y_AcDY/view?usp=drive_link
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