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Implementing Tangent stiffness for Ogden Model in UMAT

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Posts: 2
Topic starter
(@Thomas M. Moore)
New Member
Joined: 8 years ago

Hello,

I am trying to implement Ogden Model and I have derived expressions for Stress and Tangent stiffness. But I get eigen projections in the expressions. e.g. N1(*)N1 in Stress and N1(*)N1(*)N1(*)N1 in Tangent Stiffness.

How to determine the components of Tangent matrix from such expression?

Is there any other way to express Tangent Stiffness apart from Eigen projections?

1 Reply
Posts: 3998
(@jorgen)
Member
Joined: 5 years ago

You can also use a (less accurate) numerical evaluation of the tangent stiffness.

-Jorgen

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