Find the six engineering constants for a 60° boron/epoxy lamina. Use the properties of unidirectional boron/epoxy lamina from Table 2.2.
2. A bidirectional woven composite ply may yield equal longitudinal and transverse Young’s modulus but is still orthotropic. Determine the angles of the ply for which the shear modulus (Gxy) are maximum and minimum. Also find these maximum and minimum values. Given: E1 = 69 GPa, E2 = 69 GPa, ν12 = 0.3, G12 = 20 GPa.
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