Q.

What kind of elastic materials are derived from a strain energy density function?

A. cauchy elastic materials
B. hypo elastic materials
C. hyper elastic materials
D. none of the mentioned
Answer» C. hyper elastic materials
Explanation: the hyper elastic materials are derived from a strain energy density function. a model is hyper elastic if and only if it is possible to express the cauchy stress tensor as a function of the deformation gradient.
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