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Computer Aided Design Environment for Composites (CADEC) 14.1.7255.18050

Software Support for Introduction to Composite Materials Design-- 3rd Edition, CRC (2018) by Ever J. Barbero

Micromechanics-Unidirectional-Inplane Shear Strength

The in-plane shear strength refers to the strength of a composite lamina when subjected to shear stress that causes a shear deformation observable on the surface of the composite plate/shell. The in-plane shear strength of a unidirectional lamina can be measured following one of several standard test procedures, which are mentioned in the textbook. However, when a lamina is part of a laminate, the in-plane shear strength appears to increase just like the transverse tensile strength does. Because of this, the in-plane shear strength of a lamina embedded in a laminate is called in-situ shear strength. The value of in-situ strength grows proportionally to the inverse of the square root of the thickness of the lamina; the thinner the lamina, the higher the in-situ strength. Obviously, in-plane shear strength is not an invariant material property if it's value increases inversely to the square root of the lamina thickness. As it is explained in the textbook, the invariant material property that controls the in-plane shear strength is the fracture toughness of the material, from which the in-situ strength can be predicted. Micromechanics formulas based on strength of the fiber and matrix are not accurate to predict in-plane shear strength. This is due to the fact that this is not an invariant property. Instead, the value should be predicted from the value of the fracture toughness, which is invariant.

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