Reliability Prediction for Composite Joints - Bonded and Bolted.
Final rept. 1 May 73-31 Mar 74,
GENERAL DYNAMICS/FORT WORTH TEX FORT WORTH DIV
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An experimental program was conducted on coupon-size graphite-epoxy laminate-to-metal joints. Both adhesively bonded and mechanically fastened joints were tested in fatigue to the same random Flight-by-flight0 spectrum to provide lifetime and residual strength data. The empirical data developed for both types of joints was analyzed using structural reliability techniques that included the use of a probabilistic fatigue model previously introduced by Dr. J. C. Halpin of AFML and M. E. Waddoups. The program also included the development of methods for pooling dispersion data to estimate the Weibull shape parameter. Three methods were developed and directly compared Parameter averaging, normalization, and maximum likelihood. The program was a follow-on to the program reported in ARML-TR-72-121, dated March 1972.
- Couplers, Fasteners and Joints