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Journal of Composite Materials
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Life Prediction Methodology for Composite Structures. Part II—Spectrum Fatigue

Jeffery R. Schaff

Wright Laboratory Materials Directorate, Wright-Patterson Air Force Base, OH 45433-7750

Barry D. Davidson

Department of Mechanical, Aerospace, and Manufacturing Engineering, Syracuse University, Syracuse, NY 13244

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.

Journal of Composite Materials, Vol. 31, No. 2, 158-181 (1997)
DOI: 10.1177/002199839703100203
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M. R. Kharrazi and S. Sarkani
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[Abstract] [PDF]

Home page
 Journal of Composite MaterialsHome page
J. R. Schaff and B. D. Davidson
Life Prediction Methodology for Composite Structures. Part I--Constant Amplitude and Two-Stress Level Fatigue
Journal of Composite Materials, January 1, 1997; 31(2): 128 - 157.
[Abstract]