Flaw Point and Dynamic Microphotoelasticity Investigation

Abstract

The effects of load-induced flaws and preexisting flaws on the initiation and propagation of fracture in glass- and graphite-fiber-reinforced composites were studied, utilizing a birefringent epoxy resin matrix with relatively wide-spaced unidirectional and simple cross-ply fiber configurations, and combining photoelastic and high-speed photographic techniques. A broad, qualitative investigation was made to characterize differences in behavior as functions of ply type and orientation, fiber identity, type of flaw, and manner of loading. Specimens were examined under simple static tension, biaxial static compression-tension and tension-tension, cyclic tension, and dynamic impact, in all cases at room temperature.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1969
Accession Number
AD0856255

Entities

People

  • Angelo A. Caputo
  • John E. Hilzinger

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Army Aviation
  • Composite Materials
  • Cyclic Tests
  • Fabrication
  • Fiber Reinforced Composites
  • Glass Fibers
  • Graphitic Materials
  • Impact Tests
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Residual Stress
  • Tensile Strength

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Reinforced Composite Materials
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Space