煤矿用电动装载机铲刀板焊接接头的疲劳性能研究OA

The blade plate is welded from multiple metal plates,and the quality of the welded joints directly affects the overall strength and durability of the blade plate.In coal mining operations,the welded joints of the blade plate are subjected to enormous impact forces and wear under repeated loads,which can easily lead to fatigue failure.In order to better analyze the fatigue life of welded joints,a study was conducted on the fatigue performance of welded joints of the blade plates on electric loaders used in coal mines.Analyze the structural stress of the welded joint of the blade plate and clarify its stress distribution characteristics under complex stress conditions;Using welding numerical simulation technology,construct S-N curves to accurately describe the inverse relationship between welding stress amplitude and joint fatigue life;On this basis,solve the hot spot stress,design a finite element model,and verify it to achieve scientific prediction of the fatigue life of welded components.The experimental results indicate that if the weld seam height is a constant value,the lap length has a significant impact on the fatigue performance of the welded joint under low stress conditions.The larger the lap length,the longer the service life of the joint;Under high stress conditions,the lap length has no significant effect on the fatigue performance of welded joints.