Reply To: How to apply a stress as an initial load state ?

[marie-charlotte.picard]

Hello, thank you for your reply.

No, I'd like to check that the following 2 simulations have the same result:

1) Simulation of a beam fixed on one end and subjected to gravity (nlgeom, on because my material is hyperelastic, Yeoh order 2). The final stress is written to an .ist file with the command inistate, write.

2) Simulation of the same beam fixed on the same side, without gravity, but with prestress, corresponding to the final stresses of the previous simulation (read with the inistate, read command).

This works if I take a linear elastic material with small deformations (nlgeom,off), but it no longer works when nlgeom,on is activated. The simulation doesn't converge because inistate applies the stress in 1 step on the first simulation, and this stress is too high. 

My question is as follows: How do you apply a pre-stress (or a stress) as a load to a model when you're in large deformations (Step 2 works)?  How do you apply this pre-stress over several iterations to help the model converge?

Thanks for your reply, Charlotte.