Investigation of Crack Line Offset of Fracture Splitting Connecting Rod

Fracture line offset is the main defect in connecting rod fracture splitting processing, which seriously affects the using performance of connecting rod. In order to control this defect more effectively, the basic reason why this defect occurs was researched according to the theory of fracture mechanics, and the method of numerical simulation was used in this paper. The results show that when the applied load is nonparallel to the axis of a connecting rod, the first principle stress on the theoretical fracture surface is not perpendicular to the theoretical fracture line and the stress distribution is asymmetric on both sides of notches, which leads the type of fracture to turn into mixed mode I-II from mode I. As a result, the defect of fracture line offset occurs. Furthermore, the main factors leading to skew load were analyzed in actual production, and some effective measures were proposed to avoid the occurrence of this defect. This is significant in controlling the quality of connecting rod fracture splitting.