Accession Number : ADP006823

Title :   Fracture Surface Characteristics of Compressive Failures in Carbon Fibre Reinforced Epoxy Laminate Subjected to Hot/Wet Conditioning,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) INST FOR AEROSPACE RESEA RCH

Personal Author(s) : Lee, S. ; Gaudert, P. C. ; Scott, R. F.

Report Date : APR 1992

Pagination or Media Count : 8

Abstract : This paper presents the results of an investigation into the effect of environmental exposure on the compressive fracture surface characteristics of carbon/epoxy composite material (Hercules AS4/3501-6). The effects of temperature and absorbed moisture on laminates are explored. Specimens were preconditioned in either ambient laboratory humidity or in water at 64 deg C for 4 or 7 weeks. The fractures were produced at room temperature and 93 deg C. The observed fracture features (Scanning Electron Microscope) of the specimens with different preconditioning and test environments are presented. These results illustrated differences in the amount of fibre/ matrix separation, fibre fracture and resin fracture with increasing temperature and absorbed moisture. The reduction in compressive strength of laminates due to hygrothermal effects is also discussed.

Descriptors :   *EPOXY COMPOSITES, *LAMINATES, *MILITARY AIRCRAFT, *FIBER REINFORCED COMPOSITES, *FRACTURE(MECHANICS), CARBON, COMPRESSIVE PROPERTIES, ELECTRON MICROSCOPES, HUMIDITY, LABORATORIES, MICROSCOPES, MOISTURE, PLASTICS, ROOM TEMPERATURE, SCANNING ELECTRON MICROSCOPES, SEPARATION, SURFACES, TEMPERATURE, TEST AND EVALUATION, MILITARY AIRCRAFT, ABSORPTION, PREPREGS, FAILURE(MECHANICS), REPRINTS, NATO.

Subject Categories : Laminates and Composite Materials
      Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE