基于热点应力的装载机工作装置疲劳寿命研究  被引量:3

Fatigue life evaluation of loader’s working device based on hot spot stress

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作  者:万一品 俞虎升 贾洁[1] 员征文[2] WAN Yi-pin;YU Hu-sheng;JIA Jie;YUAN Zheng-wen(Key Laboratory of Road Construction Technology and Equipment,Ministry of Education,Chang’an University,Xi’an 710064;Jiangsu Xuzhou Construction Machinery Institute,Xuzhou 221004)

机构地区:[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064 [2]江苏徐州工程机械研究院,江苏徐州221004

出  处:《机械设计》2022年第9期36-41,共6页Journal of Machine Design

基  金:陕西省自然科学基金项目(2021JQ283,2022JQ572);国家科技支撑计划项目(2015BAF07B02)。

摘  要:为了预测装载机工作装置的疲劳寿命,基于工作装置作业姿态、材料属性和外载荷特性,利用热点应力建立工作装置疲劳寿命评估模型。该模型考虑了复杂工况下外载荷变化对结构疲劳的影响,结合有限元法进行模型求解,并对ZL50型装载机工作装置疲劳寿命进行研究。结果表明,动臂-车架的铰接孔销轴衬套与动臂焊接处为疲劳危险部位,基于热点应力得到关注点疲劳寿命为等效装载机连续作业9630.8 h。进行了工作装置疲劳台架试验,疲劳破坏位置与模型评估位置一致,疲劳试验寿命结果为8976.7 h,模型评估寿命与试验寿命的误差为7.29%。研究方法和结果为装载机工作装置结构优化和抗疲劳设计提供参考。In this article,in order to predict the fatigue life of the loader’s working device,with the working attitude,material properties and external load characteristics,the model of fatigue life evaluation for the working device is set up based on the hot spot stress.This model considers the influence of the external load changes under complex working conditions on the structural fatigue of the working device;it is solved with the finite-element method.The fatigue life of the ZL50 loader’s working device is explored by means of the model.The results show that the welding between the hinge pin bushing of boom-frame and boom is a dangerous fatigue position,and the fatigue life of the concerned point based on the hot spot stress is 9630.8 hours of continuous operation of the equivalent loader.Then,the working device is subject to the fatigue bench test;the failure position obtained from the fatigue test is consistent with that obtained from the model evaluation.According to the fatigue test,the life is 8976.7 hours,and the error between the life obtained from the model evaluation and that obtained from the fatigue test is 7.29%.The research methods and results provide reference for structural optimization and anti-fatigue design of the loader’s working device.

关 键 词:装载机 工作装置 热点应力 疲劳寿命 疲劳试验 

分 类 号:TH243.1[机械工程—机械制造及自动化]

 

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