Fatigue in Graphite/Epoxy Bolted Joints.

Abstract

Fatigue tests were made on graphite/epoxy bolted joints with an eight ply quasi-isotropic (90 deg, -45 deg, 0 deg, +45 deg)s laminate containing 6.35 mm diameter holes. A tensile load was applied to the specimens using a double lap joint configuration with socket head cap screws torqued to 4.0 N-m. Preliminary investigation involved static testing on a range of specimen geometries to determine failure modes, ultimate strengths, and torque effects. Increasing load (Prot) fatigue tests gave endurance limits as fractions of average static strength and were .94 for tension through the hole, .90 for corner shear/shear, and .88 for bearing. The only comparable existing data found was approximately .80 for bearing fatigue.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1980
Accession Number
ADA092362

Entities

People

  • Mark Charles Lee

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Human Systems
  • Space

DTIC Thesaurus Topics

  • Bolted Joints
  • Composite Materials
  • Diameters
  • Fabrication
  • Failure Mode And Effect Analysis
  • Fiber Reinforced Composites
  • Geometry
  • Graphitic Materials
  • Joints
  • Laminates
  • Materials
  • Materials Processing
  • Materials Testing
  • Measurement
  • Mechanical Engineering
  • Military Personnel
  • Plastic Explosives

Fields of Study

  • Physics

Readers

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