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激光冲击强化后航空发动机疲劳寿命精准度量研究

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激光冲击强化可以提升航空发动机表面强度、增强材料韧性。然而，航空发动机处于复杂的工作环境，疲劳寿命受到多个因素的影响。尤其是在激光冲击强化后，材料性能参数变化较大，导致航空发动机疲劳寿命度量难度增加，因此，提出激光冲击强化后航空发动机疲劳寿命精准度量方法。首先，分析航空发动机激光冲击强化工作原理，根据疲劳损伤理论与Von-Mises屈服准则建立航空发动机疲劳损伤函数。然后，结合疲劳损伤函数与灰色关联度分析法对影响发动机疲劳寿命的多因素展开权值分析得到航空发动机疲劳指标，从而实现航空发动机疲劳寿命的精准度量。实验结果表明，所提方法能够实现对航空发动机疲劳寿命退化轨迹的精准监测，可以精准分析发动机表面疲劳寿命的分布情况，说明该方法的航空发动机疲劳寿命度量结果更为精准。
Research on accurate measurement of fatigue life of aircraft engines after laser shock strengthening
Laser shock strengthening can enhance the surface strength of aircraft engines and enhance material toughness.However,aviation engines are in a complex working environment,and their fatigue life is influenced by multiple factors.Especially the significant changes in material performance parameters after laser shock strengthening,which increases the difficulty of measuring the fatigue life of aviation engines.Therefore,a precise measurement meth-od for the fatigue life of aviation engines after laser shock strengthening is proposed.Firstly,analyze the working prin-ciple of laser shock strengthening for aircraft engines,and establish a fatigue damage function for aircraft engines based on fatigue damage theory and Von-Mises yield criterion.Then,combined with the fatigue damage function and grey correlation analysis method,weight analysis was conducted on multiple factors that affect the fatigue life of the aircraft engine to obtain the fatigue index of the aircraft engine,thereby achieving accurate measurement of the fatigue life of the aircraft engine.The experimental results show that the proposed method can achieve precise monitoring of the fatigue life degradation trajectory of aircraft engines,and can accurately analyze the distribution of engine sur-face fatigue life,indicating that the method's fatigue life measurement results are more accurate.

laser shock strengtheningaircraft enginesfatigue damage theoryVon-Mises yield criterionfa-tigue damage functiongrey correlation analysis method

徐力君、邱伊健、谭景磊

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集美大学诚毅学院,福建厦门 361021

江西省科学院应用物理研究所,南昌 330096

南昌大学,南昌 330096

南京航空航天大学,南京 210016

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激光冲击强化 航空发动机 疲劳损伤理论 Von-Mises屈服准则 疲劳损伤函数 灰色关联度分析法

国家自然科学基金江西省科学院包干制项目基金

71902RC012212021YSBG22005

2024

10.14016/j.cnki.jgzz.2024.08.197

激光杂志
重庆市光学机械研究所

激光杂志

CSTPCD北大核心
影响因子：0.74
ISSN：0253-2743
年,卷(期)：2024.45(8)
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