Finite-Element Analysis of Interlaminar Shear Stress Due to Local Impact

TL;DRAbstract

Interlaminar delamination may occur as a result of a nonperforating low-velocity impact of a foreign object against a continuous-fiber composite laminate. Experimental evidence shows that for a crossplied laminate consisting of three lamina and subjected to a central localized impact, one delamination region will extend farther from the impact point than the second region. To establish a quantitative value for the interlaminar shear stress of a crossplied fibrous composite plate subjected to a central impact, a finite-element computer program has been utilized. Specifically, a three-dimensional dynamic-elastic-orthotropic-material finite-element program has been used in which the interlaminar shear stress can be calculated directly. This program was used to evaluate the interlaminar shear stresses for a [05/905/05] glass/epoxy plate with built-in edges, and subjected to a load simulating a central localized impact of 45.7 m/s by a cylindrical steel projectile. Results of the calculatio

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