1.内燃机可靠性国家重点实验室，山东 潍坊 261061; 2.潍柴动力股份有限公司，山东 潍坊 261061
Abstract：Taking the welded support of engine muffler as an example, the fatigue evaluation method of engine welded structure is discussed. Using the inertia release method and engine multi-body dynamics method, based on the structural stress method, the notch stress of the welded joint is calculated according to the notch coefficient of the weld root and toe, and the fatigue evaluation method of the welded structure based on the quasi-static multi-channel fatigue analysis method is established, which is simulated and verified in the market. The results show that this method performs well in market verification and tracking, and can realize the flow operations of load input, stress solution, weld identification and fatigue analysis and evaluation, and predict the fatigue life of welded structures in the early stage of product design.
Keywords:welded structure; fatigue life prediction; FKM standard