Probabilistic fatigue cumulative damage model considering the randomness of load and material properties

被引：9

作者：

Lin, Hanyu ^{[1
]}

Cao, Jing ^{[1
]}

Yao, Weixing ^{[1
,2
]}

Ma, Mingze ^{[1
]}

Wu, Tao ^{[1
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, State Key Lab Mech & Control Aerosp Struct, 29 Yudao St, Nanjing 210016, Peoples R China

[2] Nanjing Univ Aeronaut & Astronaut, Natl Def Adv Design Technol Flight Vehicle, Key Lab Fundamental Sci, 29 Yudao St, Nanjing 210016, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2023年 / 154卷

基金：

中国国家自然科学基金;

关键词：

Probabilistic fatigue cumulative damage model; P-S-N curve; Probabilistic load-exceedance curve; LIFE PREDICTION; ACCUMULATION; NUMBER;

D O I：

10.1016/j.engfailanal.2023.107693

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

A probabilistic fatigue cumulative damage model that can be applied to the fatigue life prediction of aluminum alloy under spectrum loading is proposed in this paper. The model is constructed by a novel nonlinear cumulative damage model, the P-S-N curve, and the probabilistic load-exceedance curve. It introduces the randomness of the loading process and fatigue resistance of the material to the deterministic model. In this model, it is derived that the cumulative damage under fleet spectrum loading exhibits an approximate lognormal distribution, and a method to calculate the distribution parameters is provided. Finally, the validity of the proposed probabilistic model is verified through fatigue tests on 2297-T87 aluminum-lithium alloy specimens under random loading, demonstrating its capability to capture the probabilistic nature of the fatigue behavior of aluminum alloy effectively.

引用

页数：16

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