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Three cases of aircraft accidents are described that involved failure by fatigue. All of them relate to components, rather than to the main structure of the aircraft. None of the accidents involved loss of life. The items involved were landing gear, an engine bearing and a blade from a gas producer turbine wheel. The landing gear failure was found to have resulted from prior cracking; the engine bearing...
Spectrum crack growth testing of 7050-T7451 plate was performed for T-L and L-S specimen orientations to determine the influence of spectrum truncation on fatigue crack growth rates and overall life. This testing was performed on center-hole (double crack), flat, rectangular tensile specimens machined from material blanks cut from 10.16cm plate. Additional comparison T-L tests were also accomplished...
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