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Fatigue Life Prediction of Spring Buffer in GCD-1500 Cable Drill

机译：GCD-1500电缆钻中弹簧缓冲器的疲劳寿命预测

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Conventionally designed with quasi-static algorithm, buffer springs of impact mechanism eventually have a short fatigue life. By building a rigid-flexible hybrid model of GCD-1500 cable drill, the main fatigue causes of buffer springs are investigated so as to optimize the design of springs attached to impact mechanism. Dynamic simulation is used to export load spectrum of dynamic responses of springs in conditions of “idle impact” and different bore depths. Nominal stress method is employed in nSoft Software to analyze the fatigue of springs. Some crucial conclusions are drawn: the fatigue damage brought by load spectrum of dynamic response is more severe than that brought by quasi-static mono-pulse circulation; as the bore depth is prolonged, the damage of one impact will increase; the damage of “idle impact” is 25 times as serious as that of one impact when bore depth is 70m.
机译：按照传统的准静态算法设计，冲击机构的缓冲弹簧最终具有较短的疲劳寿命。通过建立GCD-1500电缆钻的刚柔混合模型，研究了缓冲弹簧的主要疲劳原因，从而优化了冲击机构弹簧的设计。动态仿真用于导出“空转冲击”和不同钻孔深度条件下弹簧动态响应的载荷谱。在nSoft软件中采用名义应力法来分析弹簧的疲劳。得出一些关键的结论：动态响应载荷谱带来的疲劳损伤比准静态单脉冲环流引起的疲劳损伤更严重。随着钻孔深度的延长，一次冲击的破坏将增加；当孔深为70m时，“空转冲击”的破坏是一次冲击的破坏的25倍。

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