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):

Report Date:

1983-02-01

Pagination or Media Count:

69.0

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 analyticalexperimental investigations using graphite-epoxy laminates are presented and discussed in this paper. Author

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE