Life Prediction Methodology for Composite Laminates. Part 2. Spectrum Fatigue.

Abstract

A previously developed model for predicting the life of composite structures under constant amplitude and two-stress level fatigue loadings is extended and applied to structures subjected to randomly-ordered loading spectra. The model is phenomenological and a limited amount of experimental data is required for its characterization. For uniaxially loaded laminates, this consists of static tension and compression strength distributions, S-N curves based on constant amplitude fatigue life distributions for two-to-three stress ratios, and a limited amount of two-stress level fatigue test results. The model is verified by comparing predicted fatigue life distributions to experimentally observed fatigue life data for a variety of laminates and load spectrums. Good correlation between theory and experiment is obtained for all loadings and laminates studied. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1994
Accession Number
ADA294648

Entities

People

  • Barry D. Davidson
  • Jeffery R. Schaff

Organizations

  • Wright Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Composite Materials
  • Composite Structures
  • Compression
  • Curve Fitting
  • Cyclic Tests
  • Epoxy Laminates
  • Experimental Data
  • Failure Mode And Effect Analysis
  • Fatigue Life
  • Fatigue Tests (Mechanics)
  • Fighter Aircraft
  • Graphitic Materials
  • Laminates
  • Materials
  • Materials Testing
  • Mechanics

Fields of Study

  • Physics

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Dynamics.