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HETVAL subroutine in ABAQUS

HETVAL subroutine is used to define heat flux due to internal heat generation in a material. This subroutine could be dependent on state variables(such as the fraction of material transformed).HETVAL subroutine can be useful if it is necessary to include a kinetic theory for a phase change associated with latent heat release (for example, in the prediction of crystallization in a polymer casting process).