Statistical Analysis of Strength and Life of Composite Materials.

Abstract

Static strength and fatigue life of unidirectional graphite/epoxy composites are studied in terms of statistical models of fatigue degradation and residual strength. A two-segment Weibull distribution for fatigue life, and a cumulative damage rule for fatigue are introduced. Experimental tests performed support the assumption that a specimen's rank in strength is equal to its rank in fatigue life. Fatigue weakens the matrix, and thus degrades the residual compression strength, and not the residual tension strength in early life. In some cases, residual tension strength initially increases. Proof tests can guarantee a minimum strength, and to a lesser extent, a minimum fatigue life. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1980
Accession Number
ADA087741

Entities

People

  • A. S. D. Wang
  • Harry Miller
  • James Alper
  • Pei Chi Chou
  • Robert Croman

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aeronautical Laboratories
  • Air Force
  • Composite Materials
  • Death
  • Distribution Functions
  • Epoxy Composites
  • Epoxy Laminates
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Fracture (Mechanics)
  • Graphite Epoxy Composites
  • Laminates
  • Materials
  • Materials Laboratories
  • Maximum Likelihood Estimation
  • Mechanics
  • Statistical Analysis

Fields of Study

  • Materials science

Readers

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