I have an UMAT which combines the thermal expansion with crystal plasticity.
Say, I give only thermal expansion in the first step, the geometry expands and settles to some unknown displacement.
At the second step I would like to give a displacement U ( = U_expansion + U_mechanical) over the current value of displacement obtained at step-1.
I can interrupt at step -1, calculate displacements and run my entire simulation again, but is there a seamless way of doing it ?
Probably misunderstanding something: Why not just add a second step? The initial state of the second step will be the final state of the first step.
Probably misunderstanding something: Why not just add a second step? The initial state of the second step will be the final state of the first step.
You can use two separate step to run it as if the second step used the result of first one or simply you may use the coupled temp-displacement to run it. I show it in the picture for you.
Hello,
The Thermal Expansion is a Material Property and not a prescribed BCs [1]. You can define (Displacements, Temperatures, Forces and Heat flux) as a Prescribed BCs.
Use the DISP subroutine [2] to update your prescribed BCs for each step as following:
- Step1:
Define a prescribed temperature T1 for the Nodes Set_A from your computational domain by passing U(1) = T1 and JDOF = 11
- Step2:
Define a prescribed displacement for the same Nodes set by passing U(1) = U_Thermal_Step1 + U_Mech and for JDOF = 1 to 6
This displacement is defined over the final displacement from Step1 and in this case No need for interruption.
The Solver:
Since you have a UMAT subroutine, use a Fully coupled thermal-stress analysis in Abaqus/Standard [3] for each step either with an Exact or an Approximate implementation scheme depending on how much strong is the coupling.
[1] Abaqus Analysis User's Manual: Section 26.1.2 Thermal expansion.
[2] Abaqus User Subroutines Reference Manual: Section 1.1.4 DISP.
[3] Abaqus Analysis User's Manual: Section: 6.5.3 Fully coupled thermal-stress analysis.
Thanks for your comments.
My first step is purely thermal loading with kinematic constraints, But the issue is I dont know the resultant displacements from this step.
Yes, I gave a second step where in I impose applied displacements, but this is a function of displacements obtained at the first step, Is there a way to pass the displacement values obtained at first step into the second step ??
Currently I dont have a DISP subroutine, IS there a direct and easier way ?
Why ABAQUS, for multiphysics simulations, COMSOL is far easy to implement than any other tools that are currently available.
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