Accession Number : ADA139357

Title :   Fracture Mechanics of Sublaminate Cracks in Composite Laminates.

Descriptive Note : Interim rept. Oct 82-Feb 83,

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

Personal Author(s) : Wang,A S D

PDF Url : ADA139357

Report Date : Feb 1983

Pagination or Media Count : 69

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 form the coalescence of natural 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 form several analytical/experimental investigations using graphite-epoxy laminates are presented and discussed in this paper. (Author)

Descriptors :   *Composite materials, *Epoxy laminates, *Graphited materials, *Fracture(Mechanics), Cracking(Fracturing), Failure(Mechanics), Defects(Materials), Cracks, Microcracking, Stresses, Mechanical engineering

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE