Equivalent Fatigue Life and Its Application in Fatigue Reliability Design

doi:10.3901/JME.2024.22.427

Abstract

Abstract: For the high cost and few specimens of the fatigue property evaluation of the key components, a very small sampling P-S-N (fatigue life reliability design curve) measurement method, which is named as the equivalent fatigue life method (EQ method) is analyzed and determined. The EQ method is applied to fitting the P-S-N of the four metals widely used in aeronautics and astronautics: 18Cr2Ni4WA steel, LY12CZ aluminum alloy, Ti-6Al-4V titanium alloy and Incoloy 903 high temperature alloy, which also are compared with the standard methods suggested by GJB/Z 18A 2005, ISO 12107: 2012 and ASTM. Finally, the accuracy and test time of P-S-N determined by different methods are analyzed. The results indicate that the equivalent fatigue life method can measure the P-S-N curves with low cost and high efficiency, which can be suggested to determine the fatigue life reliability design curve.

Key words: equivalent fatigue life, P-S-N, fatigue reliability, very small sample size

CLC Number:

TH122

BAI Xin, ZHANG Peng, ZHANG Zhefeng, XIE Liyang. Equivalent Fatigue Life and Its Application in Fatigue Reliability Design[J]. Journal of Mechanical Engineering, 2024, 60(22): 427-436.

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