某活塞式发动机排气管断裂分析

Fracture Failure Analysis of Piston Engine Exhaust Pipe

针对某活塞式发动机排气管断裂现象,从断裂处焊接结构缺陷、焊缝组织缺陷和零件工作环境等方面进行分析。分析认为该排气管结构设计不合理,存在应力集中;恶劣的工作环境导致材料耐腐蚀性能下降,尾气对排气管形成腐蚀。该排气管断裂是焊接后的应力集中和腐蚀共同作用造成的。

The fracture fallure of the piston engine exhaust pipe was analyzed from welding structure defects, welding structure defects and working environment etc. The results showed that the exhaust pipe structure design was not reasonable and there was stress concentration. Bad working environment resulted in decrease of material corrosion resistance, and exhaust air corroded exhaust pipe. The stress concentration after welding and corrosion induced the pipe fracture.