| 过载作用下两种疲劳裂纹扩展模型的比较 |
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| 引用本文： | 徐晓冬,崔维成,黄小平.过载作用下两种疲劳裂纹扩展模型的比较[J].船舶力学,2010,14(3):263-271. |
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| 作者姓名： | 徐晓冬 崔维成 黄小平 |
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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,200030;中国船舶科学研究中心,江苏,无锡,214082 |
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| 基金项目： | supported by Natural Science Fund of Shanghai,Project No.08ZR1410000 ;;the Innovative Scholars Support Program of Jiangsu Province,2008-2010 |
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| 摘 要： | 文章改进了一种疲劳裂纹扩展模型,将原来的模型描述范围扩展到疲劳裂纹扩展的第三个阶段,并给出了一种确定模型中β值的方法。文中还将该模型与另外一种双参数疲劳裂纹扩展模型进行了比较,两种模型都通过7075-T6铝在过载作用下的疲劳试验数据进行了验证。最后,给出了比较结果,以及对两种模型应用的建议。
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| 关 键 词： | 疲劳裂纹扩展 过载 等效应力强度因子范围 疲劳韧性 |
A Comparison Between Two Models of Fatigue Crack Growth under Overload |
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| XU Xiao-dong,CUI Wei-cheng,HUANG Xiao-ping.A Comparison Between Two Models of Fatigue Crack Growth under Overload[J].Journal of Ship Mechanics,2010,14(3):263-271. |
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| Authors: | XU Xiao-dong CUI Wei-cheng HUANG Xiao-ping |
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| Institution: | 1 State Key Laboratory of Ocean Engineering;Shanghai Jiao Tong University;Shanghai 200240;China;2 China Ship Scientific Research Center;Wuxi 214082;China |
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| Abstract: | A modified engineering model of fatigue crack growth under overload is introduced to extend the former model to cover Region Ⅲ.To obtain satisfactory results,a method to determine β value is given.And a comparison analysis between the modified model and another two-parameter model is made.The two models are validated by other Al 7075-T6 material fatigue experimental data under overload.Finally,the differences between the two models are presented and suggestions are given to utilize the two models. |
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| Keywords: | fatigue crack growth overload equivalent stress intensity factor range fracture toughness |
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