基于Workbench 防冲刺短节疲劳寿命分析

在井控作业中，高速、高压流体冲击防冲刺短节，产生脉动循环冲击载荷，易产生冲击疲劳。通过疲劳寿命理论计算得出防冲蚀短节满足疲劳强度要求。然后，根据材料的S –N 曲线，通过ANSYS Workbench 多物理场耦合分析平台完成对防冲刺短节流固耦合分析，得到作用于防冲刺短节的载荷谱。利用Ncode DsignLife 疲劳分析方法对防冲刺短节进行疲劳寿命数值模拟，采用疲劳安全系数作为疲劳强度失效评价标准，得到防冲刺短节关键区域安全系数均大于1，满足其疲劳强度设计要求，且安全系数云图与应力云图分布位置相同，说明数模结果具有一定指导意义。

The Analysis of Fatigue Life About Erosion Resistance DeviceBased on Workbench

In well control operation，the high speed and high pressure fluid impacts erosion resistance device，generates pulsatingcycle impacting load and easily leads to the impacting fatigue. According to fatigue life theory，we make calculationsand find out the point where the erosion resistance device meets fatigue strength requirements. Afterwards，according to theS 􀀀 N curve of the material，we carry out the fluid-solid interaction analysis and get the load spectrum acting on the erosionresistance device based on ANSYS Workbench platform of multi-physical interaction analysis. Fatigue analysis software NcodeDsignLife is used to accomplish the numerical simulation of fatigue life of the erosion resistance device，and the fatigue safetycoefficient is presented as fatigue strength failure evaluation standard in the paper. We also find out that the safety factor aboutthe key region of the erosion resistance device is greater than 1，the requirements about fatigue strength design are met，and thecloud chart of safety factor and stress distribution are in the same position，which means that the numerical simulation resultshave some guide significances.