Reply To: Apply prestress with the inistate command, for a hyperelastic material (Yeoh)

[marie-charlotte.picard]

Hello, Thank you for your reply.

For the 2nd simulation, I know what you mean. I tried to make this 2nd simulation by applying the same gravity as the 1st, but the beam is not horizontal but has the displacement shown on the figure. How is this possible?

In reality, I have an FE mesh (as in the 2nd simulation) which is prestressed (but assumed 0 stress). I'd like to remove this prestress by applying a prestress with the inistate, read command, as I don't know the force or displacement value to apply to the model. To find out the value of the prestress to be applied with inistate, read, I run a simulation on another mesh (like the 1st beam simulation) which has the same number of elements and the same number of nodes with the same indices, but with a different geometry. I simulate this mesh I know with a UserMat law and read the post-simulation internal constraints with inistate, write. Then I wanted to apply these stresses as a loading condition on my 2nd simulation in order to remove the prestress present in the mesh of the 2nd simulation.

Does this method seem correct to you, or is there another way of applying a stress as a loading condition to a model?

Thank you for your help, 
Charlotte.