| 基于损伤-断裂力学理论的起重机疲劳寿命估算方法 |
| |
| 引用本文： | 范小宁,徐格宁,杨瑞刚.基于损伤-断裂力学理论的起重机疲劳寿命估算方法[J].中国安全科学学报,2011,21(9). |
| |
| 作者姓名： | 范小宁 徐格宁 杨瑞刚 |
| |
| 作者单位： | 太原科技大学机械工程学院,山西太原,030024 |
| |
| 基金项目： | 山西省自然科学基金资助(2010011031-5).国家科技支撑计划资助项目 |
| |
| 摘 要： | 鉴于断裂力学无法估算裂纹形成寿命及难以确定其初始裂纹尺寸,提出将损伤力学与断裂力学相结合共同估算起重机疲劳寿命的思想。针对Paris公式应用的局限性,提出将裂纹扩展率与应力强度因子幅对数线性阶段的某一裂纹尺寸作为裂纹形成寿命和裂纹扩展寿命的分界点。用损伤力学估算疲劳裂纹的形成寿命,用断裂力学估算疲劳裂纹的扩展寿命,两者寿命之和构成起重机的疲劳全寿命。这样做既能避免断裂力学寿命估算中确定初始裂纹尺寸的混乱现象;又能确保Paris公式应用在裂纹扩展率与应力强度因子幅的对数线性阶段。试验验证结果表明,估算疲劳全寿命和试验寿命基本吻合。
|
| 关 键 词： | 损伤力学 断裂力学 起重机焊接箱形梁 疲劳总寿命 裂纹形成寿命 裂纹扩展寿命 分界点 |
Fatigue Life Prediction of Crane Based on Damage-fracture Mechanics |
| |
| FAN Xiao-ning,XU Ge-ning,YANG Rui-gang.Fatigue Life Prediction of Crane Based on Damage-fracture Mechanics[J].China Safety Science Journal,2011,21(9). |
| |
| Authors: | FAN Xiao-ning XU Ge-ning YANG Rui-gang |
| |
| Institution: | FAN Xiao-ning XU Ge-ning YANG Rui-gang(College of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan Shanxi 030024,China) |
| |
| Abstract: | In view of the fact that the crack formation life could not be predicted through fracture mechanics and that the initial crack size is difficult to determine,the idea that the fatigue life of crane is assessed by the combination of damage mechanics and fracture mechanics is proposed.Considering the limitation of Paris formula,a certain crack size,which belongs to the log-linear phase between crack growth rate and stress intensity factor range,is presented as the dividing point between the crack formation li... |
| |
| Keywords: | damage mechanics fracture mechanics welded box girders of crane fatigue total life crack formation life crack propagation life dividing point |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
