等效疲劳寿命及其在疲劳可靠性设计中的应用

doi:10.3901/JME.2024.22.427

摘要/Abstract

摘要： 针对结构疲劳性能评估的成本高、样件少问题，分析并确定一种适用于超小样本量样件的P-S-N(疲劳寿命可靠性设计曲线)测定方法——等效疲劳寿命P-S-N方法。针对航空航天领域常用的四种金属材料：18Cr2Ni4WA钢、LY12CZ铝合金、Ti-6Al-4V钛合金、Incoloy 903高温合金，通过将等效疲劳寿命P-S-N方法与GJB/Z 18A 2005、ISO 12107：2012、ASTM推荐的三种方法对比，并分析了不同试验方案下各个方法获得P-S-N的准确性、稳定性、灵活性。结果表明等效疲劳寿命P-S-N方法结果准确，并具有低成本、高效率的特点，可为疲劳寿命可靠性设计曲线的确定提供新方法。

关键词: 等效疲劳寿命, P-S-N, 疲劳可靠性, 超小样本

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

中图分类号:

TH122

白鑫, 张鹏, 张哲峰, 谢里阳. 等效疲劳寿命及其在疲劳可靠性设计中的应用[J]. 机械工程学报, 2024, 60(22): 427-436.

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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