Two variables in VUMAT

[jingyuan]

Hello,

I am learning to use VUMAT and have a question in it.

What's the difference between the variables 'dt' and 'stepTime'?

According to the manual: The time at the beginning of the step = totalTime - stepTime, so stepTime should be dt....... Thanks for advise.

BTW, anyone can provide some example codes of VUMAT for beginner to learn? Thnaks

-Derek

[Jorgen]

dt = time of the current increment
stepTime = time of the current loading step

Note that a step typically contains many increments.

You can download a VUMAT for the Neo-Hookean model here (http://polymerfem.com/forums/showthread.php?t=42).

- Jorgen

[jingyuan]

dt = time of the current increment
stepTime = time of the current loading step

Note that a step typically contains many increments.

You can download a VUMAT for the Neo-Hookean model here (http://polymerfem.com/forums/showthread.php?t=42).

- Jorgen

Thanks a lot, Jorgen.

So, only for multiple-step analysis there is difference between 'totalTime' and 'stepTime', and step beginning time =totaltime-steptime.

In the case of analysis of only one step, totaltime=steptime.

Please advise if there are mistakes in my understanding. Thanks again!

[Jorgen]

You are right!

- Jorgen