Fracture Surface Characteristics of Notched Angleplied Graphite/Epoxy Composites,

reportActive / Technical Report | Accession Number: ADA305061 | Open PDF

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

Author(s):
Ginty, Carol A. ; Irvine, Thomas B.
Author Organization(s):
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
Pagination:
0025

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release, Document Partially Illegible
Distribution Statement:
Availability: Document Partially Illegible.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NASA-TM-83786
Monitor Series:
XD
 Subject Terms
Joint Capability Areas:
JCA_5.3_Planning; JCA_5_Command and Control
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*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
Field(s)/Group(s):
Laminates and Composite Materials, Mechanics
Report Date:
1984 Sep 28