I am writing a VUMAT for Johnson-Cook plasticity model and J-C fracture/failure model and comparing its results from in-built J-C model in ABAQUS/Explicit. While modeling on ABAQUS, input file reads the damage evolution as
*DAMAGE EVOLUTION,TYPE=ENERGY,SOFTENING=EXPONENTIAL
1E8
*AMPLITUDE,NAME=AMP1,DEFINITION=DECAY
-1,1,0,-0.05
While in my input file there is no damage evolution as such. How can I add damage evolution to my input file or say my VUMAT code?
Hi,
In UMAT or VUMAT, you have to define the damage stiffness matrix inside the user subroutine which shall include damage variables i.e state variables.
For accumualtion/evolution of the damage variables, you have to write the evolution formulation as well. The damage evolution may be linear or non-linear/exponential. Softening profile in the stress-strain curve depend on the damage evolution law.
BR
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