| 运用二阶摄动方法预测焊接点疲劳微弯裂纹的路径发展 |
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| 引用本文： | 杨大鹏,赵耀.运用二阶摄动方法预测焊接点疲劳微弯裂纹的路径发展[J].船舶力学,2008,12(6):932-946. |
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| 作者姓名： | 杨大鹏 赵耀 |
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| 作者单位： | 华中科技大学交通学院,武汉,430074;华中科技大学交通学院,武汉,430074 |
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| 摘 要： | 利用二阶摄动方法分析研究了轻微弯曲疲劳裂纹尖端应力强度因子的变化幅度,进一步得到了在循环载荷下直线裂纹微弯延伸尖端应力强度因子变化幅值的近似表达式.以匹配渐进扩张的形式考虑了远区域边界条件的效果,研究了裂尖附近的渐进应力场.利用Irwin公式计算出了由于裂纹发展而引起的应变能释放率变化幅值.预测了在具有非均匀断裂韧度的物质中裂纹的延伸.考虑了循环载荷、残余应力,以及由于焊接而引起的物质衰变等因素,利用了二阶摄动方法预测了沿着焊接点传播的弹脆性裂纹路径.
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| 关 键 词： | 应力强度因子幅值 微弯裂纹 二阶摄动方法 能量释放率幅值 非均匀断裂韧度 焊接物质衰变 |
A Second Order Perturbation Solution of a Slightly Curved Crack and Its Application to Prediction of Fatigue Crack Growth in Weldments |
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| YANG Da-peng,ZHAO Yao.A Second Order Perturbation Solution of a Slightly Curved Crack and Its Application to Prediction of Fatigue Crack Growth in Weldments[J].Journal of Ship Mechanics,2008,12(6):932-946. |
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| Authors: | YANG Da-peng ZHAO Yao |
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| Institution: | YANG Da-peng,ZHAO Yao(Traffic Science & Engineering College,Huazhong University of Science & Technology,Wuhan 430074,China) |
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| Abstract: | Amplitude of stress intensity factors is analyzed for a slightly curved crack by using a second order perturbation method.This method is extended to obtain an approximate representation of the amplitude of stress intensity factors at the tip of a straight crack with a slightly branched and curved extension under cyclic loading.Having examined the near tip asymptotic stress field,effects of the remote boundary conditions are taken into account in the sense of a matched asymptotic ex-pansion.Amplitude of an e... |
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| Keywords: | amplitude of stress intensity factors slightly curved crack second order perturbation method amplitude of an energy release rate inhomogeneons fracture toughness material deterioration due to welding |
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