Accession Number : ADA305061

Title :   Fracture Surface Characteristics of Notched Angleplied Graphite/Epoxy Composites,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Ginty, Carol A. ; Irvine, Thomas B.

PDF Url : ADA305061

Report Date : 28 SEP 1984

Pagination or Media Count : 25

Abstract : Composite fracture surface characteristics and related fracture modes have been investigated through extensive microscopic inspections of the fracture surfaces of notched angleplied graphite/epoxy laminates. The investigation involved 4 ply G/E laminates of the configuration (+/- theta)s where theta = 0 deg, 3 deg, 5deg 10 deg, 15 deg, 30 deg, 45 deg, 60 deg, 75 deg, and 90 deg. Two-Inch wide tensile specimens with 0.25 in. by 0.05 in. throughslits centered across the width were tested to fracture. The fractured surfaces were then removed and examined using an Amray 1200 Scanning Electron Microscope (SEM). Evaluation of the photomicrographs combined with analytical results obtained using the CODSTRAN computer code have culminated in a unified set of fracture criteria for determining the mode of fracture in notched angleplied graphite/epoxy laminates. (AN)

Descriptors :   *FRACTURE(MECHANICS), *GRAPHITE EPOXY COMPOSITES, COMPUTER PROGRAMS, TENSILE STRENGTH, SCANNING ELECTRON MICROSCOPES, SURFACE ANALYSIS, MICROSTRUCTURE, STRUCTURAL ANALYSIS, TENSILE STRESS, CRACKING(FRACTURING), MATRIX MATERIALS, DEFECTS(MATERIALS), SHEAR STRESSES, TENSION, EPOXY LAMINATES, DELAMINATION, NOTCH TOUGHNESS, PHOTOMICROGRAPHY.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE