Compressive Fatigue in Glass and Graphite Reinforced Composites.

Abstract

This report characterizes the compressive fatigue failure are described for unnotched laminates. A normalized slope parameter with units of percent decreases of ultimate compressive stress per decade of applied cycles is used to characterize the fatigue resistance ofthe materials. The degradation by water immersion of the Graphite/Epoxy systems is shown to be a loss static compressive strength and a decrease in normalized slope on the order of 10 percent. Multiple Regression Analysis used to quantify the effects of varying unidirectional ply laminate orientation shows that the compressive fatigue resistance of advanced composites cannot be satisfactorily explained only by ply orientation characterization. Various physical theories concerning the causes and processes of ultimate failure during compressive fatigue are postulated, based on the microstructures of the specimens and phenomena observed during testing.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1978
Accession Number
ADA072690

Entities

People

  • Jeffrey Durnell Conners

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Fabrication
  • Failure Mode And Effect Analysis
  • Glass Fiber Reinforced Plastics
  • Glass Fibers
  • Laminates
  • Material Degradation Processes
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Micromechanics
  • Physical Properties
  • Regression Analysis
  • Tensile Strength

Fields of Study

  • Materials science

Readers

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