Hi, I am implementing a temperature-dependent shell material in Radioss UMAT via dll. * In sigpc29c, is the TEMP(NEL) array read-only? * If I calculate a temperature increase from plastic work, can I write it back to TEMP(i), or must I store it in UVAR to ensure it persists? * Does the solver automatically pass the nodal temperature to sigpc29c, or is additional setup required in the /MAT/USER/29 card? Thanks!

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User defined Material assign Temperature in dll

Dhaval6363

Hi, I am implementing a temperature-dependent shell material in Radioss UMAT via dll.

In sigpc29c, is the TEMP(NEL) array read-only?
If I calculate a temperature increase from plastic work, can I write it back to TEMP(i), or must I store it in UVAR to ensure it persists?
Does the solver automatically pass the nodal temperature to sigpc29c, or is additional setup required in the /MAT/USER/29 card?

Thanks!

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Dhaval6363

Thank you. i was using 2021.2 version of radioss, but in 2026 version its worked completely. Thank you.

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Guilherme_

Hello Dhaval.

I'm attaching an example of a temperature-dependent Young Modulus Subroutine.

I hope it helps.

Temp-Dependent_E.zip

Dhaval6363

https://community.altair.com/discussion/comment/199275#Comment_199275

Thank you for your example.

I checked the nodal temperature, and it is showing as zero. I also tried modifying some parameters, but the value still remains zero. I wanted to ask if there is any specific reason for this behavior, or if there is something else that needs to be defined or activated.

I would appreciate your guidance on this.

regards,
Dhaval Kukadiya

Guilherme_

Hello

Which version are you using? I cannot reproduce the issue in v2026.

Dhaval6363

Thank you. i was using 2021.2 version of radioss, but in 2026 version its worked completely. Thank you.

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