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explicit analysis critical time-step Ansys


 I am trying to solve a simple cantilever beam (2D)  in ansys.

I wish to find out the critical time-step that can be used to explicitly solve a transient problem. 


I started with modal analysis to determine the maximum natural frequency of the model. I then computed dt < 2/Wmax.

I use this dt with beta = 0.0 and gamma = 0.25 (Newmark parameters). However the solution is unstable.

I am including my apdl script with this post.

I'd really appreciate if someone could explain why the computed dt does not yield a stable solution in this case.



! ---- apdl script attached ----!

Plain text icon Ansys.txt1.78 KB
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