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How can I use multiple user subroutines in Abaqus? Should each subroutine have a separate file or be placed in the same .for file? How?

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We can have more than one Abaqus subroutine in one file. Abaqus himself will call both subroutines wherever and whenever it needs during analysis.

For example, if you are writing a UMAT and a USDFLD, your Fortran file will have such a structure:

Remember that a given user subroutine (such as UMAT or USDFLD) should appear only once in the specified user subroutine source.

See Also:

Training Package: Introduction to UMAT and VUMAT Subroutines

Q&A: What are specific internal energy and dissipated inelastic specific energy? Can they affect VUMAT results? 

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