考虑非线性累积损伤的铸造起重机疲劳性能分析  

FATIGUE PERFORMANCE ANALYSIS OF CASTING CRANES CONSIDERING NON⁃LINEAR CUMULATIVE DAMAGE

作　　者：闫梦煜 魏国前[1,2,3] 段若尘 YAN MengYu;WEI GuoQian;DUAN RuoChen(Key Laboratory of Metallurgical Equipment and Control Technology,Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Precision Manufacturing Institute,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学冶金装备及其控制教育部重点实验室,武汉430081 [2]武汉科技大学机械传动与制造工程湖北省重点实验室,武汉430081 [3]武汉科技大学精密制造研究院,武汉430081

出　　处：《机械强度》2024年第4期977-983,共7页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(51575408,52175481)资助。

摘　　要：针对铸造起重机在服役过程中的疲劳问题,考虑实际的疲劳载荷谱,基于非线性累积损伤原理分析其疲劳性能。首先对某钢厂在役铸造起重机的关键疲劳危险点进行了应力时间历程实测,然后基于双参数雨流计数法和Goodman等寿命方程编制了一维载荷谱,采用常用的线性累积损伤模型和低⁃高、高⁃低的非线性累积损伤模型,计算并分析了关键部位的损伤特性和寿命特性。结果表明,铸造起重机的疲劳载荷谱与疲劳计算点所在部位和实际服役过程密切相关;非线性累积损伤模型与常用的线性累积损伤模型相比具有较高的预测精度,采用高⁃低的载荷加载顺序可以获得更加保守的寿命预测结果。Aiming at the fatigue problem of casting cranes in service process,considering the actual service load spectrum,the fatigue performance of casting cranes was analyzed based on the non⁃linear cumulative damage principle.Firstly,the stress time history of the key fatigue hot spots of the in⁃service casting crane in a steel plant was measured.Then,the one⁃dimensional load spectrum was compiled based on the two⁃parameter rain flow counting method and Goodman equal life equation.In addition,the commonly used linear cumulative damage model and low⁃high and high⁃low non⁃linear cumulative damage model were used to calculate and analyze the damage and life characteristics of the key parts.The results show that the fatigue load spectrum of casting cranes is closely related to the location of fatigue calculation point and the actual service process.Compared with the commonly used linear cumulative damage model,the non⁃linear cumulative damage model has higher prediction accuracy,and more conservative life prediction results can be obtained by using the high⁃low load loading sequence.

关 键 词：铸造起重机 非线性累积损伤 疲劳性能 疲劳载荷谱 服役过程 

分 类 号：TH14[一般工业技术—材料科学与工程] TH218[机械工程—机械制造及自动化]