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liebealt's blog

What‘s the timing of calling a abaqus user subroutine?

Hi all,

 

The question is that is there any document about the timing of calling a user subroutine in ABAUQS? (i.e., UEXTERNALDB being called at the start/end of the analysis or current incerment, UMAT being called at the start of the increment and iteration). I had a document specifying these details for almost every subroutine by attaching them on the flow chart of ABAQUS analysis, but unfortunately I lost it. I wonder if someone happens to have this document or something like this and is willing to share it. Any help would be appreciated.

 

liebealt

stress at a point other than integration points in VUMAT/UMAT

Hi all,

The question is how can the stress at a point other than integration points be evaluated in VUMAT/UMAT. Interpolation may be a general method. However, to me, it seems not so easy to be implemented, for I have no idea of the way to retrieve the necessary information of all integration points (their indexes, positions etc.) belongint to a identical FE. Any help would be appreciated.

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