A measure of the degree of orthotropy of a material is given by the ratio of the
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Question:
A measure of the degree of orthotropy of a material is given by the ratio of the longitudinal to transverse Young’s modulus. Given the properties of S-glass and graphite (high modulus) from Table 1.1 and using the rule of mixtures for EL and the constant-stress model for ET, find the fiber volume fraction at which the degree of orthotropy is maximum for graphite/epoxy and glass/epoxy unidirectional laminae.
70% fiber volume fraction
Use the properties of E-glass from Table 1.1, as well as Em= 3.4 GPa, f = 0.2 and m = 0.3.
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