1. A uniaxial load is applied to a 10° ply. The linear stress–strain curve along the line of load is related as σx = 123εx, where the stress is measured in GPa and strain in m/m. Given E1 = 180 GPa, E2 = 10 GPa and ν12 = 0.25, find the value of (1) shear modulus, G12;and (2) modulus Ex for a 60° ply.
2. The tensile modulus of a 0°, 90°, and 45° graphite/epoxy ply is measured as follows to give E1 = 26.25 Msi, E2 = 1.494 Msi, Ex = 2.427 Msi for the 45° ply, respectively
1. What is the value Ex for a 30° ply?
2. Can you calculate the values of ν12 and G12 from the previous three measured values of elastic moduli?
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