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| Numerical Simulation Analysis of Cracking Force of Engine Connecting Rod Based on Stress Intensity Factor |
| Received:November 22, 2018 Revised:March 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.03.022 |
| KeyWord:connecting rod cracking force stress intensity factor extended finite element method plastic zone |
| Author | Institution |
| DANG Lin-yuan |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| LU Yao-hui |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| LU Chuan |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| ZHU Sheng-chang |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
| BI Wei |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| Objective To get the appropriate cracking force and take a car engine connecting rod as the research object to calculate and analyze the cracking force during the cracking process of connecting rod through the extended finite element method (XFEM). Methods According to the actual size of the component, the finite element model of the connecting rod cracking under the prefabricated incision was set up. Related material parameters were determined and the finite element mesh was divided. The constraint types between the components were determined, and the different initial micro crack sizes were set up. Based on the fact that the stress intensity factor was greater than the fracture toughness of the material and the crack propagation, the cracking force when the stress intensity factor reached the fracture toughness of the material was calculated repeatedly; further, the relationship between the initial micro crack length and the cracking force was obtained by a large number of calculations and data fitting. The effect of cracking force on the plastic zone was analyzed, providing guidance for the determination on the cracking force threshold. Results When the cracking force could meet the technological requirements, the length of the prefabricated initial micro cracks should be as small as possible. Conclusion The ideal cracking force is the cracking force corresponding to the fracture toughness of the material. The analytical method proposed in this paper is also suitable for the determination of the cracking forces of different types and different materials. |
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