One of the problems with composite materials, as we all know, is the number of properties that must be measured and reported. At a minimum, each unidirectional ply has four stiffness properties: longitudinal and transverse Young's moduli, plus one Poisson's ratio and one in-plane shear modulus. In addition, it has five strength properties: longitudinal tensile and compressive strengths, transverse tensile and compressive strengths and in-plane shear strength. Then, when multidirectional laminates are made of unidirectional plies, the possible variations in stiffness and strength properties are limitless.
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