Reliability evaluation of fatigue crack initiation life distribution in titanium alloy
by Wu Jingzi, Gu Haicheng, Zhou Huijiu
International Journal of Materials and Product Technology (IJMPT), Vol. 4, No. 1, 1989

Abstract: Double-annealed alpha + beta titanium alloy TC9 has been employed to study the statistical distribution of fatigue crack initiation life. Low-cycle fatigue data and P-S-N curves as well as cyclic stress-strain relations serve as a basis for the calculation of fatigue initiation lives by means of a local strain procedure. The results calculated are in good agreement with experimental results, which were determined from notched three-point bending specimens by infrared technique to monitor the appearance of 0.10 to 0.12 mm long fatigue cracks. The fatigue initiation life data were then fitted to a log-normal distribution and conclusions were drawn on the basis of the 'weakest link' model.

Online publication date: Sat, 06-Nov-2010

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