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Compute the tensile strength for the composite of given exercise assuming that all the fibers have the same tensile strength.
Exercise
Give an approximate value for the compressive strength of an Al-Boron composite with Vf = 0.4. Aluminum 2024 has E = 71GPa, Poisson = 0.334, G = 26.6 GP a, yield strength = 76 MP a, fatigue limit = 90 MP a, elongation = 22%.
Boron fibers have E = 400 GP a, ultimate strength = 3.4 GP a, Poisson = 0.25. Note that Boron fibers tend to be perfectly straight and that aluminum has a linear shear stress-strain plot before it yields.
A student is pushing a crate up a 20 degree incline. Find the magnitude of the normal force between crate and incline
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