Current military specifications call for increased realism in fatigue testing. Criteria are discussed which recognize those portions of a spectrum that should be random and those that should be deterministic.
This paper documents a research program which included spectrum development, test facility setup, and a limited test series. The spectrum was a flight-by-flight random load history including realistic mission temperature exposures. The test facility utilized a small digital computer for closed-loop control of load and temperature.
Results of tests on three sets of five boron-epoxy-to-titanium bonded joints are discussed, and the effects of temperature exposure and time acceleration are investigated.
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