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一种改进的多轴疲劳模型及其在飞机液压管道疲劳寿命预测中的应用。

A Modified Multiaxial Fatigue Model and Its Application for the Fatigue Life Prediction of Aircraft Hydraulic Pipes.

作者信息

Wang Yantian, Qiu Yuanying, Li Jing, Bai Jin, Wang Yan

机构信息

School of Mechatronic Engineering, Xidian University, No. 2 South Taibai Road, Xi'an 710071, China.

Xi'an Aerospace Propulsion Test Technology Institute, Xi'an 710100, China.

出版信息

Materials (Basel). 2024 Dec 17;17(24):6154. doi: 10.3390/ma17246154.

DOI:10.3390/ma17246154
PMID:39769754
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11677439/
Abstract

The fatigue failure of a structure may occur under a multiaxial vibration environment; it is necessary to establish a better multiaxial fatigue life prediction model to predict the fatigue life of the structure. This study proposes a new model (MWYT) by introducing the maximum absolute shear stress into the WYT model. The feasibility of the MWYT model is verified by using the multiaxial fatigue experimental data of 304 stainless steel, Q235B steel, 7075-T651 aluminum alloy and S355J0 steel. Further, finite element vibration simulations are performed on a typical parallel hydraulic pipe structure, and the vibration simulation results of the pipe structure are verified through the vibration experiment. Finally, the MWYT model is used to predict the fatigue lives of the pipe structure under random excitation and pulsation excitation, respectively, and the fatigue life of the pipe structure under the combined loading from random excitation and pulsation excitation is predicted based on Miner's rule. By comparing with the design life of the aircraft, the predicted life of the pipe structure meets the service requirements for it.

摘要

结构的疲劳失效可能发生在多轴振动环境下；有必要建立一个更好的多轴疲劳寿命预测模型来预测结构的疲劳寿命。本研究通过将最大绝对剪应力引入WYT模型，提出了一种新的模型（MWYT）。利用304不锈钢、Q235B钢、7075-T651铝合金和S355J0钢的多轴疲劳实验数据验证了MWYT模型的可行性。此外，对典型的平行液压管道结构进行了有限元振动模拟，并通过振动实验对管道结构的振动模拟结果进行了验证。最后，分别利用MWYT模型预测了管道结构在随机激励和脉动激励下的疲劳寿命，并基于Miner法则预测了管道结构在随机激励和脉动激励联合作用下的疲劳寿命。通过与飞机设计寿命进行比较，管道结构的预测寿命满足其使用要求。

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