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How does abaqus calculate deformation gradient in presence of thermal expansion

rajan_prithivi's picture

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 ?
How does abaqus calculate deformation gradient in presence of thermal expansion ?

 

-Prithivi

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