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Simple constitutive law for ductile fracture with softening


motamed
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(@motamed)
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Hello Dr Jorgen,

I am trying to model with abaqus the start of an avalanche with a simple model : strong elastic layer on weak elastoplastic layer. I would like to have a simple law for the second one : elastoplastic with softening (cf law.jpg) . Is it possible with one of the plastic laws proposed by Abaqus or do i need to write a UMAT ?

Thanks in advance

Johan

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Jorgen
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Is your graph in terms of engineering strain and stress, or true strain and stress?

- Jorgen

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motamed
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(@motamed)
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It is true stress and strain but I should have precised that i only want to describe the shear softening behavior of this weak layer... im not interested in the other components .

Johan

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Jorgen
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I dont think that the built-in plasticity models in Abaqus supports softening. I suspect that a UMAT/VUMAT is the way to go. I have a few UMAT/VUMAT [URL= https://polymerfem.com/index.php?pageid=umats ]subroutines[/URL] that does what you are looking for.

-Jorgen

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