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We are easily able to obtain mechanical properties (such as elastic modulus, Poisson's ratio and ...) of a unidirectional lamina composite by means of rule-of-mixture.
For instance, in case of "longitudinal loading", strength of the fiber-reinforced composite for long continuous fibers will be like:
I have two main questions:
First, are these relations (longitudinal and transverse loading) hold for bidirectional composite? if not, how can we obtain relative elastic modulus?