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Why COMSOL still requires the Young's modulus and Poisson ratio when defining an anisotropic material?

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Hi all,

I want to play with Comsol for 3D simulations of linear elastic material. The materials are anisotropic so that I define elasticity matrices for them. But Comsol still requires me to give values for the Young's modulus and Poisson ratio (there is the little "stop" red sign in front of these properties). Why is that?

Thanks

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