| 桥式起重机桥架疲劳裂纹扩展的数值分析 |
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| 引用本文： | 龙靖宇,甘文兵.桥式起重机桥架疲劳裂纹扩展的数值分析[J].武汉科技大学学报(自然科学版),2011,34(1). |
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| 作者姓名： | 龙靖宇 甘文兵 |
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| 作者单位： | 武汉科技大学机械自动化学院,湖北武汉,430081 |
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| 摘 要： | 采用有限元方法,计算某桥式起重机桥架的最大主应力分布,通过应力状态判断桥架某处裂纹的主要断裂类型,并利用扩展有限元方法(XFEM),计算桥架在最大载荷和最小载荷两种状态下不同裂纹长度时裂纹的尖端应力强度因子(SIF),由此根据Paris疲劳裂纹扩展公式的基本理论,描述该处疲劳裂纹扩展的基本规律,建立裂纹长度与交变应力循环周期数的函数关系,对起重机桥架裂纹短期内快速扩展的原因给出量化分析。结果表明,低应力的循环作用是该处裂纹形成和快速扩展的原因。
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| 关 键 词： | 桥式起重机桥架 应力强度因子 扩展有限元方法 疲劳裂纹扩展 |
Numerical analysis of fatigue crack growth on bridge crane frame |
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| Long Jingyu,Gan Wenbing.Numerical analysis of fatigue crack growth on bridge crane frame[J].Journal of Wuhan University of Science and Technology(Natural Science Edition),2011,34(1). |
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| Authors: | Long Jingyu Gan Wenbing |
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| Institution: | Long Jingyu,Gan Wenbing(College of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081,China) |
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| Abstract: | Finite element method was used to calculate the maximum principal stress distribution on a certain bridge crane frame.Through the stress state,the crack fracture type on the frame was determined,and extended finite element method(XFEM) was employed to calculate the stress intensity factor(SIF) at the tip of the cracks of different lengths under maximum load and minimum load.According to the Paris fatigue crack propagation formula,basic patterns of the fatigue crack propagation was described accurately and t... |
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| Keywords: | bridge crane frame SIF XFEM growth of fatigue crack |
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