基于低载强化的横向稳定杆随机疲劳寿命预估  

RANDOM FATIGUE LIFE PREDICTION OF STABILIZER BAR BASED ON LOW LOAD STRENGTHENING

作　　者：胡玉侠[1] 王海杰 刘新田 HU YuXia;WANG HaiJie;LIU XinTian(Department of Basic,Suzhou Vocational and Technical College,Suzhou 234000,China;School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]宿州职业技术学院基础部,宿州234000 [2]上海工程技术大学机械与汽车工程学院,上海201620

出　　处：《机械强度》2023年第5期1221-1228,共8页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(52172371)资助。

摘　　要：为了探讨低载强化在随机载荷下对构件疲劳寿命的影响,以汽车横向稳定杆为例,通过超阈值外推方法将采集的随机载荷信号外推到全生命周期。并基于外推后的载荷信号,分析其均值和幅值的分布特性,建立二维联合概率分布。根据稳定杆工作时不断承受复杂随机载荷的特点,考虑均值和幅值的影响编制二维载荷谱,并引入低载强化理论。将基于线性疲劳累积损伤理论(Miner准则)和低载强化理论预估的寿命与试验结果进行对比,验证随机载荷下基于低载强化预估寿命的有效性和精确性。To explore the effect of low load strengthening on the fatigue life of parts under random load,the automobile stabilizer bar is taken as an example,and the collected random load signal is extrapolated to the whole life cycle by peak over threshold extrapolation method.Based on the extrapolated load signal,the distribution characteristics of its mean and amplitude are analyzed,and the two-dimensional joint probability distribution is established.According to the characteristic that the stabilizer bar is continuously subjected to complex random loads,the influence of mean and amplitude is considered to compile the two-dimensional load spectrum,and the low load strengthening theory is introduced.The life prediction based on linear fatigue cumulative damage theory(Miner rule)and low load strengthening theory is compared with the test results to verify the effectiveness and accuracy of life prediction based on low load strengthening under random load.

关 键 词：随机载荷 超阈值外推 低载强化 寿命预估 

分 类 号：TG111.8[金属学及工艺—物理冶金]