Reply To: Undetectable Error – mostly combat instabilities

[Jim Day]

It's understood that you need to apply pressure from the explosion to the structure. Since it's not clear what's making the solution unstable, I would recommend simplifying the model just temporarily while debugging. Eliminate the ALE portion of the model and just apply a pressure time history to the structure using *LOAD_SEGMENT_SET which very roughly approximates an explosive pressure. Is that simplified model stable?