| 铁路货车转向构架B级铸钢的疲劳极限及损伤 |
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| 引用本文： | 于连友,赵永翔,杨冰. 铁路货车转向构架B级铸钢的疲劳极限及损伤[J]. 机械工程学报, 2011, 47(4). DOI: 10.3901/JME.2011.04.110 |
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| 作者姓名： | 于连友 赵永翔 杨冰 |
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| 作者单位： | 1. 齐齐哈尔轨道交通装备有限责任公司,齐齐哈尔,161002
2. 西南交通大学牵引动力国家重点实验室,成都,610031 |
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| 基金项目： | 国家自然科学基金(50821063); 铁道科技发展计划重点(2004J013)资助项目 |
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| 摘 要： | 研究中国铁路货车转向架B级铸钢的概率疲劳极限。研究中采用小子样升降法疲劳试验,揭示出该材料的疲劳裂纹主要萌生于铸造缺陷;在较低应力幅范围,裂纹扩展韧性有所降低,但仍呈现典型疲劳河流与阶梯状花纹及辉纹,并伴随有二次裂纹,属于韧性疲劳特征。视疲劳极限定义为期望寿命下服从正态分布的疲劳强度,应用极大似然法测定概率疲劳极限。与现有常规法、DIXON-MOOD法和ZHANG-KECECIOGLU法比较,证明极大似然法是唯一满足给定寿命的疲劳强度定义,效果良好的方法。针对其他方法,尤其是ZHANG-KECECIOGLU法,给出分散性与偏差较大的预测。
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| 关 键 词： | 铁路 转向架 铸钢 疲劳极限 概率分析 |
Fatigue Limits and Damage of the Grade B Cast Steel for Chinese Railway Freight Car Bogie Frames |
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| YU Lianyou,ZHAO Yongxiang,YANG Bing. Fatigue Limits and Damage of the Grade B Cast Steel for Chinese Railway Freight Car Bogie Frames[J]. Chinese Journal of Mechanical Engineering, 2011, 47(4). DOI: 10.3901/JME.2011.04.110 |
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| Authors: | YU Lianyou ZHAO Yongxiang YANG Bing |
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| Affiliation: | YU Lianyou1 ZHAO Yongxiang2 YANG Bing2(1.Qiqihar Railway Rolling Stock Co.,Ltd.,Qiqihar 161002,2.Traction Power State Key Laboratory,Southwest Jiaotong University,Chengdu 610031) |
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| Abstract: | Fatigue limits and damage are investigated experimentally on the grade B cast steel for Chinese railway freight car bogie frame.Small sample up-and-down test method is employed for the study.Results reveal that fatigue cracks are initiated mostly from the cast flaws and shrinkage cavities.The fatigue cracks grow with river like flowers and many sub-cracks.Distinct tough eddies are distributed on the fracture surface.Maximum likelihood method is applied for the probabilistic measurement of the fatigue limits... |
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| Keywords: | Railway Bogie Cast steel Fatigue limit Probabilistic analysis |
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