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Usage of predef in umat

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Posts: 13
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(@Gordon)
Active Member
Joined: 15 years ago

Hi all

I am trying to model a material in UMAT subroutine for ABAQUS

I was just going thru the list of Variables passed in for information.

There is a variable called PREDEF, about which ABAQUS help manual says that it is an Array of interpolated values of predefined field variables at this point at the start of the increment, based on the values read in at the nodes.

I couldnt understand exactly where we can use it and where can we define field variables??

For my model I need to use values of variables of previous iteration to get the new values of those variables.

Can I use PREDEF to do so??

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

Based on your description I would not recommend the PREDEF, but instead I recommend that you use the state variables.

-Jorgen

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