# Umat\_ABAQUS and Umat\_ABAQUSNL **URL:** \ **Category:** Uncategorized\ **Created:** [April 8, 2024, 12:32pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206 "2024-04-08T12:32:05Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Rdn10](https://avatars.discourse-cdn.com/v4/letter/r/9d8465/32.png) [@Rdn10](https://calculix.discourse.group/u/Rdn10)\ **Post date:** [April 8, 2024, 12:32pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206/1 "2024-04-08T12:32:05Z")
Hello everyone, I am new to CalculiX. Can anyone explain to me how to use these subroutines. It states in one of them ¨This routine allows for the use of an ABAQUS umat user subroutine in CalculiX. ¨ I don´t understand what it means. ---
**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\ **Post date:** [April 8, 2024, 12:36pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206/2 "2024-04-08T12:36:04Z")
First check the [documentation](https://www.dhondt.de/ccx_2.21.pdf) chapter _8.5.2 ABAQUS umat routines_. ---
**Author:** ![Rdn10](https://avatars.discourse-cdn.com/v4/letter/r/9d8465/32.png) [@Rdn10](https://calculix.discourse.group/u/Rdn10)\ **Post date:** [April 8, 2024, 12:53pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206/3 "2024-04-08T12:53:40Z")
Thank you for responding. I already read that section. My question is if I have a umat developed for Abaqus, can I use it directly in calculix or should I use write another one? ---
**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\ **Post date:** [April 8, 2024, 12:59pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206/4 "2024-04-08T12:59:11Z")
The functionality described there is for use of Abaqus UMAT subroutines directly in CalculiX. However, some limitations and differences are mentioned below and should be considered before trying to use the subroutine. Give it a try though. ---
**Author:** ![jbr](https://avatars.discourse-cdn.com/v4/letter/j/ecccb3/32.png) [@jbr](https://calculix.discourse.group/u/jbr)\ **Post date:** [April 8, 2024, 1:08pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206/5 "2024-04-08T13:08:40Z")
> [@Rdn10](#): > > My question is if I have a umat developed for Abaqus, can I use it directly in calculix or should I use write another one? That is the intent of these two subroutines. However, as mentioned by @Calc_em , you will likely need to tweak a few things. ---
**Author:** ![Rdn10](https://avatars.discourse-cdn.com/v4/letter/r/9d8465/32.png) [@Rdn10](https://calculix.discourse.group/u/Rdn10)\ **Post date:** [April 8, 2024, 1:57pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206/6 "2024-04-08T13:57:22Z")
Thank you very much. Another thing is whether anyone was able to use VUMAT in Calculix because there is nothing about it in the documentation. ---
**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\ **Post date:** [April 8, 2024, 2:06pm UTC](https://calculix.discourse.group/t/umat-abaqus-and-umat-abaqusnl/2206/7 "2024-04-08T14:06:39Z")
> [@Using Abaqus VUMAT files in CalculiX](https://calculix.discourse.group/t/using-abaqus-vumat-files-in-calculix/1027): > > Hello Everyone, Does anyone have experience using Abaqus VUMAT files in CalculiX? I am looking for example files to get going. Many thanks, JW I wouldn’t be surprised if it didn’t work but give it a try. Just let us know if it works.