| 铝合金缺口试样疲劳寿命预测新方法研究 |
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| 引用本文： | 刘潮涛,王悦东,兆文忠.铝合金缺口试样疲劳寿命预测新方法研究[J].大连交通大学学报,2014,35(6):19-22. |
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| 作者姓名： | 刘潮涛 王悦东 兆文忠 |
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| 作者单位： | 大连交通大学交通运输工程学院,辽宁大连,116028 |
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| 基金项目： | 铁道部科技研究开发计划资助项目，辽宁省高等学校杰出青年学者成长计划资助项目 |
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| 摘 要： | 借鉴基于断裂力学的Walker裂纹扩展公式的形式,对主ΔSs-N方法中的裂纹扩展公式进行修正,得到一种新的考虑了平均应力影响的等效结构应力ΔSg.由于焊接结构中存在着高值残余应力,平均应力对于焊接接头的疲劳寿命影响并不显著,但对于非焊接缺口件,平均应力的影响是显著的.对11种铝合金缺口试样进行有限元分析,建立以ΔSg为参数的ΔSg-N曲线族,并对得到的数据进行二元线性回归分析,得到不同置信度下的主ΔSg-N曲线.将其与试验得到的以名义应力S和等效结构应力ΔSs为参数的ΔSs-N曲线族进行对比,发现ΔSg-N曲线存在着良好的归一性.
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| 关 键 词： | 主ΔSg-N曲线 Walker裂纹扩展公式 缺口试样 线性回归 数据对比 |
Research on New Methods of Aluminum Alloy Fatigue Life Prediction Notched Specimens |
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| LIU Chaotao,WANG Yuedong,ZHAO Wenzhong.Research on New Methods of Aluminum Alloy Fatigue Life Prediction Notched Specimens[J].Journal of Dalian Jiaotong University,2014,35(6):19-22. |
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| Authors: | LIU Chaotao WANG Yuedong ZHAO Wenzhong |
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| Institution: | (School of Traffic ＆ Transportation Engineering, Dalian Jiaotong University, Dalian 116028, China) |
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| Abstract: | A new equivalent structural stress ΔSgwas obtained when the crack propagation formula in masterΔS-N method was corrected by using the Walker crack propagation formula for reference,the effect of mean stress was also included in this stress. High-value residual stress is found in the welded structures. The fatigue life is not too much influenced by mean stress,but for the non-welded notched specimen,it is significant. 11 kinds of finite element model of aluminum alloy notch specimens were analyzed. The master ΔSg-N curve under different degrees of confidence was obtained through the equation of bivariate linear regression. At last,the ΔSg-N curve was compared with the nominal stress S obtained by test and the equivalent structural stressΔSsin Verity,and the normalization is obvious. |
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| Keywords: | master △Sg-N curve Walker crack propagation formula notched specimen linear regression data comparison |
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