| 双裂纹损伤下TBM刀盘结构疲劳寿命分析 |
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| 引用本文： | 吴勉,凌静秀,成晓元,王文景.双裂纹损伤下TBM刀盘结构疲劳寿命分析[J].福建工程学院学报,2022,0(4):397-401. |
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| 作者姓名： | 吴勉 凌静秀 成晓元 王文景 |
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| 作者单位： | 福建工程学院机械与汽车工程学院 |
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| 摘 要： | 基于Paris 公式建立TBM 刀盘的裂纹扩展模型，利用Workbench 模拟裂纹的开裂过程，计算出其循环次数与应力强度因子。 并改变双裂纹的初始长度、距离、角度，分析多部位损伤时筋板的裂纹扩展寿命。 结果表明，裂纹的初始长度越长构件越容易失效，每增加2.5 mm 寿命将减少35%，而双裂纹距离对寿命的影响较小，在10%以内。 当裂纹方向和受力方向垂直时，构件容易失效，反之则对寿命的影响越小。 该研究可为刀盘设计过程中疲劳寿命领域提供参考。
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| 关 键 词： | TBM刀盘 双裂纹扩展 Paris公式 疲劳寿命 |
Fatigue life analysis of TBM cutter head structure under double crack damage |
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| WU Mian,LING Jingxiu,CHENG Xiaoyuan,WANG Wenjing.Fatigue life analysis of TBM cutter head structure under double crack damage[J].Journal of Fujian University of Technology,2022,0(4):397-401. |
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| Authors: | WU Mian LING Jingxiu CHENG Xiaoyuan WANG Wenjing |
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| Institution: | School of Mechanical and Automotive Engineering, Fujian University of Technology |
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| Abstract: | Based on the Paris formula, the crack propagation model of the TBM cutter head was established, and the cracking process of the crack was simulated by Workbench, and the cycle times and stress intensity factor were calculated. The initial length, distance and angle of the double cracks were changed so as to analyze the crack propagation life of the rib when multiple parts are damaged. Results show that the longer the initial length of the crack, the more likely the component will fail, and the life will be reduced by 35% for every 2.5 mm increase, while the double-crack distance has less effect on the life, i.e., within 10%. When the crack direction is perpendicular to the force direction, the component is prone to failure, and otherwise, the impact on the life is smaller. This research can provide reference for the field of fatigue life in the design of cutter head. |
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| Keywords: | TBM cutter head double crack propagation Paris formula fatigue life |
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