Hello everyone
Well, this is my first post here so I hope this news will allow me the pleasure of chatting with you on this topic.
So, as a student engineer in mechanical engineering specializing in numerical mechanics, I am engaged for simulating crash square tube on Abaqus with the explicit dynamics and Riks static. With the explicit dynamics everything is fine, but I lost with the Riks static, where I still haven't got a result and even I am not able to start the running.
I am attaching images of the results with explicit dynamics.
Thank you for your time and consideration.
Best regards, Firass
If your intend nos is to do a nonlinear static analysis you mas use the implicit code, which can also do nonlinear dynamics and more accurately so than the explicit code in buckling analysis. The Riks method will work fine in nonlinear statics on the implicit cod if you introduce an appropriate imperfection. In your square tube case, I would advise using the *IMPERFECTION keyword to preload the first eigenvalue resulting from a previous bifurcation buckling analysis creating a file output that will be then read by the cited keyword. Scale the eigenvector with an appropriate factor ( say 0.005-in or a small fraction of the wall thickness). Start with a small increment.
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