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error code144 and isotropic hardening in UMAT

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Posts: 16
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(@hamidabcdef)
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Joined: 14 years ago

hello everybody

i want to develop a constitutive law for fiber reinforced composite. so i am using umat subroutine to simulate it in abaqus.

when i begin analysis i got error code 144.

my question is: is jacobian matrix DDSDDE can be to cause for this error??

and i read that i can use uhard subroutine for isotropic and combined hardening.

using this subroutine we can get yield surface from hardening curve, so we must enter some value in abaqus^material^(yield stress with corresponding strain)

but where and how we must enter that values, is in user materials under other constant or we create plastic and enter them like doing analysis with plasticity without umat.

thank you

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