Accession Number:

ADA305061

Title:

Fracture Surface Characteristics of Notched Angleplied Graphite/Epoxy Composites,

Descriptive Note:

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s):

Report Date:

1984-09-28

Pagination or Media Count:

25.0

Abstract:

Composite fracture surface characteristics and related fracture modes have been investigated through extensive microscopic inspections of the fracture surfaces of notched angleplied graphiteepoxy laminates. The investigation involved 4 ply GE laminates of the configuration - thetas 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 graphiteepoxy laminates. AN

Subject Categories:

  • Laminates and Composite Materials
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE