Accession Number : ADP001922

Title :   Fracture Mechanics of Sublaminate Cracks in Composite Laminates,

Corporate Author : DREXEL UNIV PHILADELPHIA PA DEPT OF MECHANICAL ENGINEERING AND MECHANICS

Personal Author(s) : Wang,A. S. D.

Report Date : JUL 1983

Pagination or Media Count : 19

Abstract : This paper presents an overview of a fracture mechanics approach to some of the most frequently encountered matrix-dominated, sub-laminate cracks in epoxy-based composite laminates. By sub-laminate, it is meant that the cracks are internal to the laminate, generally invisible macroscopically; but are much larger in size than those microcracks considered in the realm of micromechanics. The origin of sub-laminate cracks is assumed to stem from the coalescence of natural material flaws (also microcracks) which occur under a certain favorable laminate stress condition. Thus, the modelling of the mechanisms of sub-laminate crack initiation and propagation is essentially mechanistic and probabilistic in nature. Some specific results from several analytical/experimental investigations using graphite-epoxy laminates are presented and discussed in this paper.

Descriptors :   *Epoxy laminates, *Fracture(Mechanics), Composite structures, Matrix materials, Structural mechanics, Crack propagation, Fatigue(Mechanics), Strength(Mechanics), Models, Structural analysis

Distribution Statement : APPROVED FOR PUBLIC RELEASE