Hygrothermal Damage Mechanisms in Graphite-Epoxy Composites.

Abstract

This report covers experimental and analytical studies of T300/5209 and T300/5208 graphite-epoxy laminates: (1) to determine the coupling between applied stress, internal residual stress, and moisture sorption kinetics, (2) to examine the microscopic damage mechanisms due to hygrothermal cycling, (3) to evaluate the effect of absorbed moisture and hygro- thermal cycling on inplane shear response, (4) to determine the permanent loss of interfacial bond strength after moisture absorption and drying, aid (5) to evaluate the three-dimensional stress state in laminates under a combination of hygroscopic, thermal and mechanical loads. Specimens were conditioned to equilibrium moisture content under steady exposure to 55 or 95% RH at 70 or 93 deg C. Some specimens were tested subsequent to moisture conditioning and 100 cycles between -54 deg C and either 70 deg C or 93 deg C. jg p4

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1979
Accession Number
ADA303830

Entities

People

  • Frank W. Crossman
  • R. E. Mauri
  • W. J. Warren

Organizations

  • Lockheed Martin Missiles and Space

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Body Weight
  • Composite Material Fabrication
  • Composite Materials
  • Literature Surveys
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Micromechanics
  • Stress Strain Relations
  • Tensile Strength
  • Three Dimensional

Readers

  • Polymer Science and Engineering.
  • Structural Health Monitoring of Composite Structures.