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Unformatted text preview: graphite/epoxy has a longitudinal modulus of 22.0 Msi, a transverse modulus of 3.5 Msi, a (transverse) shear modulus of 0.80 Msi, and a major Poissons ratio of 0.28. The (isotropic) styrofoam has a modulus of 0.50 Msi, and a major Poissons ratio of 0.35. The application is cantilevered and has a length of 5 feet and width of 10 inches. The loading is a tip load of up to 400 pounds (including a dynamic load factor). CROSS-SECTION (not to scale) z y 10 400 lb z x 5 ft 0.40 thick foam 0.40 thick foam = 0.10 thick unidirectional graphite/epoxy Find: (a) the maximum stress, xx , in the beam and its location. (b) the through-thickness distribution of the shear stress, xz , and its maximum value and location (plot it). (c) the maximum deflection (and divide this into bending and shearing components)....
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- Fall '02