| 激光熔化沉积高合金钢疲劳裂纹扩展研究 |
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| 引用本文： | 段成红,翁志伟,罗翔鹏,池瀚林. 激光熔化沉积高合金钢疲劳裂纹扩展研究[J]. 激光技术, 2021, 45(6): 691-696. DOI: 10.7510/jgjs.issn.1001-3806.2021.06.003 |
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| 作者姓名： | 段成红 翁志伟 罗翔鹏 池瀚林 |
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| 作者单位： | 北京化工大学 机电工程学院 化工设备设计研究所,北京100029 |
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| 摘 要： | 为了研究激光熔化沉积高性能合金钢构件的疲劳问题，采用扩展有限元法和直接循环分析相结合的方法，进行了典型件疲劳裂纹扩展路径的分析, 并进行了剩余寿命的预测。通过中心裂纹拉伸(CCT)试样的疲劳试验获得了材料Paris公式中的参量，并将其用于有限元模拟中。同时，分别运用有限元模拟方法和试验方法研究了CCT、紧凑拉伸-剪切试样的裂纹扩展过程。结果表明, 有限元法得到的裂纹扩展路径和疲劳寿命与试验结果吻合良好，其中裂纹扩展路径偏转角的误差在16.54%以内，疲劳寿命的误差在2.72%以内。该方法可以较好地预测激光熔化沉积高合金钢构件的疲劳裂纹扩展路径和剩余疲劳寿命，具有一定的工程意义。
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| 关 键 词： | 激光技术 疲劳裂纹扩展 扩展有限元 高合金钢 |
| 收稿时间： | 2021-01-18 |
Study on fatigue crack growth of laser melting deposited high alloy steel |
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| Abstract: | In order to study the fatigue problem of laser melting deposition(LMD) high alloy steel, the fatigue crack growth path and residual life prediction of typical samples were analyzed by the extended finite element method and the direct cyclic. The parameters in Paris formula were obtained by the fatigue experiment of center crack tension(CCT)specimen, and then were used in the finite element simulation. The crack growth process of CCT and compact tension shear samples was studied by the finite element simulation and the experiment respectively. The results indicate that the crack growth path and fatigue life obtained by the finite element simulation are in good agreement with the experiment data. The error of deflection angle of crack propagation path is less than 16.54%, and the error of fatigue life is less than 2.72%. The results show that this method can predict the fatigue crack growth path and fatigue life of LMD high alloy steel components well, which has a certain engineering sense and practice value. |
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