Interlaminar Fatigue Crack Growth in a Thermoplastic-Matrix Fiber Composite at Room and Elevated Temperatures

Abstract

A study on the interlaminar fatigue crack growth behavior in a thermoplastic matrix composite at both room elevated temperatures is presented. Experiments are conducted on an AS4-graphite fiber/polyamide J1 resin composite system. Details of interlaminar crack growth are studied, using double- cantilever beam (DCB) composite specimens under displacement controlled cyclic loading. Governing fracture mechanics parameters, (GI)max' (GI)min and GI delta during fatigue, are determined from a geometrically nonlinear analysis of the DCB experiment. The interlaminar fatigue experiments, conducted at room and elevated temperatures up to the glass-transition temperature of the resin matrix, reveal that crack growth in the composite follows the Paris' type power- law equation at all test temperatures. The exponent n of the power-law expression remains relatively constant at temperatures below the glass- transition of the matrix resin.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1989
Accession Number
ADA234103

Entities

People

  • A. Miyase
  • J. Blondet
  • K. B. Su
  • S. S. Wang

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Fracture (Mechanics)
  • Glass Transition Temperature
  • Graphitic Materials
  • Laminates
  • Material Degradation Processes
  • Materials
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanics
  • Micromechanics
  • Polymer Matrix Composites
  • Resins
  • Thermoplastic Composites
  • Transition Temperature

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.