Fracture Behavior of Thick, Laminated Graphite/Epoxy Composites.

Abstract

The effect of laminate thickness on the fracture behavior of laminated graphite/epoxy (T300/5208) composites has been studied. The predominantly experimental research program included the study of the 0/+ OR - 45/90sub ns and 0/90sub ns laminates with thicknesses of 8, 32, 64, 96 and 120 plies and the 0/+ OR - 45sub ns laminate with thicknesses of 6, 30, 60, 90 and 120 plies. The research concentrated on the measurement of fracture toughness utilizing the center-cracked tension, compact tension and three point bend specimen configurations. Fracture toughness was computed using the stress intensity factor results of a finite element stress analysis of each specimen geometry which treated the composite as homogeneous but anisotropic. The development of subcritical damage at the crack tip was studied nondestructively using enhanced x-ray radiography and destructively using the laminate deply technique. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1984
Accession Number
ADA305132

Entities

People

  • C. E. Harris
  • D. H. Morris

Organizations

  • Virginia Tech

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Composite Materials
  • Epoxy Composites
  • Epoxy Laminates
  • Failure Mode And Effect Analysis
  • Finite Element Analysis
  • Fracture (Mechanics)
  • Geometry
  • Laminates
  • Literature Surveys
  • Materials
  • Materials Testing
  • Measurement
  • Mechanics
  • Micromechanics
  • Stress Strain Relations
  • Two Dimensional

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.