Determine the restrictions on elastic constants


Solve the following problem:

The following data has been obtained experimentally for a composite based on an unidirectional carbon-epoxy prepreg (MR50 carbon fiber at 63% by volume in LTM25 epoxy). Determine if the restrictions on elastic constants are satisfied.

E1 = 156.403 GPα, E2 = 7.786 GPα

v12 = 0.352, v21 = 0.016

G12 = 3.762 Gpα

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