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Compute the stresses in laminate coordinates at top and bottom of each lamina in Example 1 when the laminate is subjected to ε0x = 765(10-6 ) mm/mm, ε0y = -280(10-6 ) mm/mm, κxy = 34.2(10-6)1/mm and all remaining strains and curvatures equal to zero.
Example 1
Compute the coefficients in the plate stiffness equations (given) for a twolamina laminate with θ1 = 55°, θ2 = -55°, t1 = t2 = 0.635 mm, with material properties given in Example 2.
Φx = δw0/δx
Φy = δw0/δy
Example 2
Compute the reduced stiffness matrix [Q] and the intralaminar shear coefficients using the following properties: E1 = 19.981 GP a, ν12 = 0.274, E2 = 11.389 GP a, G12 = G13 = 3.789 GP a [172]. Lacking experimental data, assume the out-of-plane shear modulus G23 ∼= Gm = 0.385 GP a.
Consider the following material called carbon-epoxy with a fiber volume fraction of 70% and Ef = 379 GPa, νf = 0.22, Em = 3.3 GPa, and νm = 0.35. Compute E1, E2, ν12, and G12 using both the rule of mixtures (ROM) and more accurate formulas recommende..
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