I have made a UMAT subroutine to describe the mechanical behaviour of a shape memory alloy (SMA) following the Brinson model. However, I don't know how to make the Abaqus software know the original shape of a shape memory part so that when the glass transition temperature is applied, the SMA is able to recover its original shape.
Does anyone know how to make a part for example with a V shape (shape previously modified by applying a pressure to the part at the glass transition temperature) become completely straight, when the shape memory is applied?
I am not sure which Brinson do you mean. But if you are sure that the model itself can capture actuation (not only superelastic loading), you must use the original configuration (in your case, completely straight) as your main model, then by inducing loads you could achieve the stress-induced phase transformation to martensite accompanied by shape change; afterwards upon applying temperature boundary conditions you can capture the shape recovery.
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