When we only have mechanical loading, I understand that abaqus calculates the total deformation gradient using F = I + partial_U/partial_X and U = N_i*U_i where U_i is the displacement at the nodes and N is the shape function .
If I use a thermal expansion in addition to mechanical loading , Does abaqus give the total deformation gradient incorporating both mechanical loading and thermal expansion ?
F = I + partial_Utot/partial_X ; Utot = U_mechanical + U_thermal
If I am running an UMAT ( updated lagrangian) , does the U_thermal is incorporated at the first step as a whole or does it incrementally ramp up ?
Hi
When the model is starting, it would create a Stiffness matrix and the model would (and should) take in to account any prestressing and /or any induced loading due to any deflection. Therefore, the model creates the matrix for each step your deflection should be a combination of mechanical and thermal deflection.
Having said that it depends on how you simulated your model.
Hope above helps
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