A Study of Failure Characteristics in a Thermoplastic Composite Material at High Temperature

Abstract

The purpose of this thesis was to study the failure characteristics of the thermoplastic composite Graphite/Polyetheretherketone (Gr/PEEK) at 250 F. Specimens of Gr/PEEK containing a hole (1/3 diameter to width ratio) were tested at 250 F to determine stress-strain response near the hole, the progression of failure, and ultimate tensile strength. Testing of the specimens containing 45 degree fibers was complicated when the high temperature coupled with the high strains caused the strain gages to become unglued prematurely. Optical techniques of measuring strains were used on both the basic property specimens with a hole to determine the feasibility of these techniques and to provide an experimental basis for comparison for the analysis. A high speed video camera was used to record failure of the specimens with holes. Data on approximately how rapidly the different ply lay-ups fail is valuable in modeling the progression of failure analytically. Theses.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1988
Accession Number
ADA203015

Entities

People

  • James M. Fisher

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Autonomy
  • Counter WMD
  • Cyber
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Cameras
  • Composite Materials
  • Elastic Properties
  • Finite Element Analysis
  • Graphitic Materials
  • High Temperature
  • Laminates
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Working
  • Mechanics
  • Strain Gages
  • Stress Strain Relations
  • Tensile Strength
  • Thermoplastic Composites

Readers

  • Structural Health Monitoring of Composite Structures.