目的 为了研发设计某型号二通阀，使其正常工作2年内（5000 h）不失效。方法 基于Ansys Workbench仿真软件对二通阀阀芯撞击盖板过程进行显式动力学分析和疲劳分析，得到二通阀的薄弱环节，并对关键易损部位进行优化设计和对比分析。结果 将最小截面处直径由24.5 mm增至28 mm后，在不影响二通阀密封性能的前提下，满足二通阀持续工作5000 h不发生疲劳破损。结论 对二通阀进行显式动力学分析后，再以阀芯撞击盖板时的最大应力加载阀芯进行了疲劳分析，使分析结果更为可靠。

The work aims to design a two-way valve to make it normally run over 2 years (5000 h) without failure. Based on the Ansys Workbench simulation software, the explicit dynamics and fatigue for the valve core that impacted the cover plate were analyzed. Weak links of the two-way valve were obtained. Optimization design and contrastive analysis were conducted for key vulnerable elements. When the diameter of the minimum cross section of the valve core was changed from 24.5 mm to 28 mm without affecting the sealing performance of the two-way valve, the optimized two-way valve was able to run continuously for 5000 h without fatigue damage. In conclusion, fatigue analysis is carried out to after explicit dynamics of two-way valve is analyzed and then the maximum stress obtained when the valve element impacts the cover plate is applied to the valve element. Therefore the results of analysis are more reliable.