How to define anisotropic thermal expansion coefficient tensor

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Hello,

For a custom material I am defining, I wanted to know how to define the anisotropic thermal expansion coefficient tensor. More specifically, how to define the anisotropic thermal expansion coefficient tensor in cylindrical coordinates. For my project, I seek to have my material only expand radially upon an increase in temperature and I was wondering how to do that.

Any input would be greatly appreciated!

Best, AU



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