Dear colleagues
I'm modeling bone healing around dental implants using Abaqus subroutines (UMAT / USDFLD).
I wonder:
1. How SDVs of current and previous increment can be accessed in the current increment through UMAT ?
2. and how SDVs of previous increments (eg. 10 previous increments) can be accessed in the current increment through USDFLD ?
Thanks in advance,
Yunus.
PS: The value of SDVs at the beginning of the current increment can be accessed by GETVRM utility routine in USDFLD
When you are writing an ABAQUS UMAT or USDFLD subroutine, you have access to certain information from the current and previous increments.
If you need access to a history of SDVs, you must implement that functionality yourself. For example, you could use an array of SDVs and, at each increment, "shift" the array, discarding the oldest value and adding the newest one.
This method could be implemented as follows:
- Define an array of 10 SDVs.
- At the end of each increment, "shift" the array by moving all values one position down (SDV(2) to SDV(1), SDV(3) to SDV(2), etc.). The SDV value from the current increment would then be stored in SDV(10).
- In this way, SDV(1) will always contain the value from 10 increments ago, SDV(2) from 9 increments ago, and so on.
Remember that these modifications must be thoroughly tested to ensure they work as expected.
As always, when working with complex subroutines like these, it is a good idea to refer to the ABAQUS documentation and consider contacting ABAQUS support or an experienced ABAQUS user for guidance.
Yunus Rezvanifar,
Interesting question!
as Joshua Depiver said, I think you should save the desired data in an array of SDV separately in each step. However, I think the amount of calculations data will be too much for large models.
Good luck
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