| 复杂应力场中裂纹疲劳扩展寿命预报 |
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| 引用本文： | 王丽丽,黄小平,崔维成.复杂应力场中裂纹疲劳扩展寿命预报[J].船舶力学,2011,15(4). |
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| 作者姓名： | 王丽丽 黄小平 崔维成 |
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| 作者单位： | 上海交通大学,海洋工程国家重点实验室,上海,200240;中国船舶科学研究中心,江苏,无锡,214082 |
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| 基金项目： | 上海市自然基金项目，江苏省创新学者基金 |
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| 摘 要： | 船舶作为一种大型焊接结构,其疲劳热点部位的应力应变场分布很复杂,要预报这些部位的裂纹疲劳扩展寿命,必须解决复杂场中裂纹的应力强度因子计算及其裂纹扩展方向问题.该文对船舶肘板处两种不同原因产生的裂纹的扩展路径、扩展速率进行了研究.裂纹扩展方向用第一主应力准则确定,在裂纹扩展方向上给定不同的裂纹增量,得到不同长度裂纹的复合裂纹等效应力强度因子,并拟合这些计算结果得出船舶肘板的应力强度因子计算式.结合裂纹扩展率单一曲线模型对肘板裂纹扩展寿命进行了预报,预报结果与实验结果符合得较好,说明所采用的方法可行.对建立船舶典型节点的裂纹扩展寿命预报方法有参考价值.
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| 关 键 词： | 船舶节点 复杂应力场 裂纹扩展速率 裂纹扩展路径 等效应力强度因子 单一曲线模型 |
Fatigue crack growth life prediction of cracks in complex stress field |
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| WANG Li-li,HUANG Xiao-ping,CUI Wei-cheng.Fatigue crack growth life prediction of cracks in complex stress field[J].Journal of Ship Mechanics,2011,15(4). |
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| Authors: | WANG Li-li HUANG Xiao-ping CUI Wei-cheng |
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| Institution: | WANG Li-li1,HUANG Xiao-ping 1,CUI Wei-cheng 2(1 Shanghai Jiao Tong University,Shanghai 200240,China,2 China Ship Scientific Research Center,Wuxi 214082,China) |
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| Abstract: | Ship is a kind of huge welding structure,the stress distribution around its fatigue hot spot is very complex.The key problems in predicting the crack propagation life of cracks in complex stress field are the solutions of stress intensity factor(SIF) and crack growth direction.In this paper,the crack path and crack propagation of two kinds of cracks caused by two different reasons were studied.The crack growth direction is determined by the law of first principle stress.By given different crack increasement... |
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| Keywords: | ship detail complex stress field propagation rate crack path ESIF the unique function of propagation |
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