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User Define Failure Criterion with Holzapfel Model  


yoav lev
Posts: 1
(@yoav lev)
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Joined: 4 years ago

I am planning to model crack propagation on soft tissues using XFEM. Since ABAQUS has already the built-in Holzapfel hyperelastic material, this make things a bit easy. Based on the Holzapfel model, there are two terms define on the strain energy function: 1) non-collagenous isotropic ground material 2)collagen fibre. My idea would be to define different damage criterion for the non-collagenous part and the collagen fibre part.

Hence, I would like to know if the user damage subroutine (UDMGINI) has the capability to do such a thing. Based on the documentation, I understand a bit of the UDMGINI function and Ive seen some of the application especially for composite failure. But to apply it with the Holzapfel model seems to puzzle me a bit. If someone can provide some ideas, that would be much appreciated.

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Jorgen
Posts: 3874
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(@jorgen)
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Joined: 10 months ago

Sounds interesting. Please keep us updated on your progress with XFEM for soft tissues.

I have not use the UDMGINI feature (I mainly use UMAT and VUMAT for abaqus). I have created multiple implementations of the Holzapfel-Gasser-Ogden model, and also of various damage models. It works great in UMAT and VUMAT functions.

-Jorgen

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dxaboom
(@dxaboom)
Joined: 1 year ago

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Posts: 1
Posted by: @jorgen

Sounds interesting. Please keep us updated on your progress with XFEM for soft tissues.

I have not use the UDMGINI feature (I mainly use UMAT and VUMAT for abaqus). I have created multiple implementations of the Holzapfel-Gasser-Ogden model, and also of various damage models. It works great in UMAT and VUMAT functions.

-Jorgen

Hello sir Jorgen,

 

it's possible to share one of your umat code for the HGO model ? i would like to use it for mechanical comparaison. I used the anisohyper_inv but i would like to test and learn with a complete umat.

Best regards

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