Environmental Effects on the Mechanical Properties of Glass Fiber/Epoxy Resin Composites. Part 1. Effect of Static Immersion in Water on the Tensile Strength of Cross-Ply Laminates

Abstract

This report describes studies to determine the effect of water absorption on the tensile strength of 90/0/90 deg laminates. The ultimate strength was found to decrease continuously with increasing amounts of water absorption. Yield stress first increased and then decreased to form a broad maximum. Assuming perfect bonding between the laminae, the change of yield stress could be predicted by overlapping the decrease of interlaminar residual stress (as a prestress) and the change of failure stress of 90 deg lamina. Anisotropic volume expansion of the laminae by water absorption is considered to be responsible for the relaxation of interlaminar residual stress.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1978
Accession Number
ADA056299

Entities

People

  • Byung-lip Lee
  • Robert E. Sacher
  • Robert W. Lewis

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Biomedical
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aging (Materials)
  • Composite Material Fabrication
  • Composite Materials
  • Glass Fibers
  • Laminates
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Plastics
  • Reinforced Plastics
  • Stress Strain Relations
  • Tensile Strength

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Reinforced Composite Materials
  • Spectroscopy.