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Computer Aided Design Environment for Composites (CADEC) 14.1.6392.14245

Software Support for Introduction to Composite Materials Design-- 2nd Edition, CRC (2011) by Ever J. Barbero

Micromechanics-Unidirectional-Strengths-Intralaminar

Intralaminar shear strength refers to the strength of a composite lamina when subjected to out-out-plane shear, that is, to shear causing deformations of the cross section. This is in contrast to in-plane shear stress that causes shear deformation of the surface of the lamina or composite plate/shell. There are two intralaminar values of shear strength, called F4 and F5, depending of what cross section is deforming. Using the textbook's convention, with a deformation in the cross section (2,3), i.e., a plane perpendicular to the fiber direction (1), the lamina fails at a intralaminar shear strength F4. With a deformation in the cross section (1,3), i.e., a plane perpendicular to the transverse direction (2), the composite fails at a intralaminar shear strength F5. Lacking experimental data, the value of F5 can be assumed equal to the in-plane shear strength F6. The value of F4 can be measured by the end-notch flexure test, or calculated by CADEC using micromechanics.

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