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Closed form expresion for fatigue life prediction at combined HCF/LCF loading. (English) Zbl 1224.74106

The authors present a procedure for estimation of crack initiation and propagation in the conditions of high cycle fatigue (HCF) cycles of service loading and low cycle fatigue (LCF) cycles for start-up and shutdown. It is applied for life estimation of aircraft components - gas turbine and compressor discs and blades made of the titanium alloy Ti-6Al-4V. A closed-form expression for estimation of the crack propagation life for the case of combined HCF/LCF loading is proposed, based on a simplified stress history consisting of one LCF stress block followed by one HCF stress block.

MSC:

74R99 Fracture and damage
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