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material LAW25: strain rate dependent elastic stiffnesses

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in the RADIOSS reference guide (2017, page 328) they say the material law 25 contains strain rate effects.

In the Tsai-Wu yield criterion, where the strain rate acts, the strain rate only influences the yield strengthes.

How do i get strain rate dependent elastic stiffnesses?

Thank you very much!

Kind regards

Tim Winkler

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