Abstract
The experimentally determined sensitivity of composite to metal joint properties to fatigue spectrum parameters and environment is presented. The residual strength and/or life of matrix/adhesive dominated bonded graphite/epoxy to titanium step-lap joints are significantly affected by frequency, load dwell/waveform, real flight time spectrum, load truncation and stress level/root-mean-square increases. Moisture and increased spectrum severity reduce bonded joint tensile residual strength by 17% at ambient and 34% at flight temperatures. Fibre dominated graphite/epoxy to steel bolted joints are not significantly sensitive to the loading contents and environment and may be qualified in accelerated tests with temperature not to exceed 120°C.
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