Simulation And Analysis Of Connecting Rod Fracture Splitting Base On XFEM

Engine connecting rod fracture splitting technology is the technology of fracture method to complete the split processing of connecting rod body and cover the joints, which has incomparable superiority to traditional processing methods. In recent years, it is a major change to the traditional techniques of connecting rod and has become an important symbol of the engine manufacturing development of a country that the technology has been gradually developed with the rapid development of automobile industry and applied to the field of large-scale production. Due to many factors affecting the final fracture splitting results in the cracking process and high precision machining requirements, it is of great significance to study the fracture splitting processing factors.In this paper, a method of combining simulation and experiment has been used. Adoption of a new method for the extended finite element method (XFEM) carried out a detailed study on the fracture splitting technology of connecting rod in the crack extension. The main work of the paper includes:1. This paper has taken an example to verify rationality of the XFEM crack extension problem. With the experimental data of Jilin University three-point bending fracture experiments, by extended finite element method (XFEM), the paper has compared the results with the experimental data to determine its feasibility and error.2. The paper established finite element model of the connecting rod fracture splitting and simulated and analyzed the fracture splitting processing based on XFEM. After the determination of crack initiation and propagation path and variation of separation force, the paper analyzed the plastic deformation of the connecting rod.3. In the paper, the effect of fracture splitting parameters on the fracture splitting process of linkage has been analyzed; then established the relationship of notch depth and the maximum pyrolysis force, and analyzed the effect on the plastic deformation region; imposed residual stress at the crack tip region, and got the impact of different residual stress on fracture splitting; changed lever wedge angle to determine the variation law of the linkage force, and analyzed characteristics of the plastic deformation region after its cleavage is complete considering the expansion sets are load bearing in the fracture splitting process.4. Considering variation principles of the connecting rod plastic deformation region when the actual separation force is greater than the required separation force, the paper determined the selection principle of the separation force; considering the connecting rod cracking limit conditions, which are unilateral fracture and connecting rod rupture without fracture condition, the paper simulated and analyzed them to determine the processing security. According to the above cleavage factors influencing the research, analyzed the splitting processing defects and their causes.