Effects of Proof-Test on the Strength and Fatigue Life of a Unidirectional Composite.

Abstract

The effects of a static proof-load on the statistical distribution of the static strength and fatigue life of a unidirectional graphite-epoxy laminate (As-3501-05) are investigated experimentally. Loading mode for both the static and fatigue tests is restricted to uniaxial tension in the fiber direction. 6-ply tension coupons with dimensions of 22.9 cm x 1.9 cm are used; and all tests are conducted using a closed-loop Instron tester, under room temperature (21 C) and ambient humidity (60% R.H.) conditions. The data are analyzed using a two-parameter Weibull distribution in conjunction with the max. likelihood method for parameter estimation. Results show that proof-load can guarantee a min. static strength, and to less degree can assure a min. fatigue life. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1979
Accession Number
ADA076334

Entities

People

  • A. S. D. Wang
  • James Alper
  • Pei Chi Chou

Tags

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Composite Materials
  • Contracts
  • Corporations
  • Distribution Functions
  • Epoxy Laminates
  • Fatigue Life
  • Fatigue Tests (Mechanics)
  • Humidity
  • Laminates
  • Materials
  • Materials Laboratories
  • Materials Testing
  • Probability
  • Random Variables
  • Statistical Analysis

Readers

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