Fatigue Properties of Multidirectional Braided Composites.

Abstract

The fatigue performance of graphite/epoxy composites manufactured using a general braiding process was evaluated. Two styles of braided composites were fabricated and tested. Style I was the basic (1 x 1) braid pattern. Style II was constructed by holding half of the yarns as straight columns and braiding the rest of the yarns about the fixed yarns. Performance was compared to a 24 ply conventional laminate. Tension-tension, compression-compression and fully reversed constant amplitude fatigue tests were performed. Both style braids exhibited similar behavior, except style II had longer compression-compression fatigue life. As expected, in all fatigue conditions the braids had shorter lives than the baseline laminate. Non the less, the fatigue threshold stress levels observed for the braids as a percent of ultimate strength were similar to current laminated construction design stress values. Keywords: Graphite epoxy composites; Three dimensional fabric; Fatigue(Materials).

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1985
Accession Number
ADA162572

Entities

People

  • J. M. Alper
  • L. W. Gause
  • R. H. Dalrymple

Organizations

  • Naval Air Warfare Center Warminster

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Composite Materials
  • Epoxy Composites
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Governments
  • Graphitic Materials
  • Laminates
  • Materials
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Shear Tests
  • Tensile Strength
  • Three Dimensional

Fields of Study

  • Education
  • Materials science

Readers

  • Materials Science.
  • Military History of the United States in the 20th Century.
  • Structural Health Monitoring of Composite Structures.