Life prediction methodology for composite structures. Part II - Spectrum fatigue

Jeffery R. Schaff, Barry D. Davidson

Research output: Contribution to journalArticlepeer-review

115 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)158-181
Number of pages24
JournalJournal of Composite Materials
Issue number2
StatePublished - 1997

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Chemistry


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