Accession Number : ADA305132

Title :   Fracture Behavior of Thick, Laminated Graphite/Epoxy Composites.

Descriptive Note : Contractor rept.,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIEN CE AND MECHANICS

Personal Author(s) : Harris, C. E. ; Morris, D. H.

PDF Url : ADA305132

Report Date : MAR 1984

Pagination or Media Count : 189

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)

Descriptors :   *FRACTURE(MECHANICS), *EPOXY LAMINATES, *GRAPHITE EPOXY COMPOSITES, THICKNESS, LOAD DISTRIBUTION, TENSILE STRENGTH, STRESS ANALYSIS, FINITE ELEMENT ANALYSIS, CRACKING(FRACTURING), DISPLACEMENT, FIBER REINFORCED COMPOSITES, TOUGHNESS, X RAYS, CRACK PROPAGATION, ALUMINUM, FAILURE(MECHANICS), STRENGTH WEIGHT RATIO, RADIOGRAPHY, NOTCH TOUGHNESS, BORON ALLOYS.

Subject Categories : Textiles
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE