| 党林媛,卢耀辉,卢川,朱生长,毕伟.基于应力强度因子的发动机连杆裂解力数值模拟分析[J].装备环境工程,2019,16(3):106-110. DANG Lin-yuan,LU Yao-hui,LU Chuan,ZHU Sheng-chang,BI Wei.Numerical Simulation Analysis of Cracking Force of Engine Connecting Rod Based on Stress Intensity Factor[J].Equipment Environmental Engineering,2019,16(3):106-110. |
| 基于应力强度因子的发动机连杆裂解力数值模拟分析 |
| Numerical Simulation Analysis of Cracking Force of Engine Connecting Rod Based on Stress Intensity Factor |
| 投稿时间：2018-11-22 修订日期：2019-03-25 |
| DOI：10.7643/ issn.1672-9242.2019.03.022 |
| 中文关键词: 连杆 裂解力 应力强度因子 扩展有限元法 塑性区 |
| 英文关键词:connecting rod cracking force stress intensity factor extended finite element method plastic zone |
| 基金项目:国家自然科学基金项目（51275428），四川省科技厅国际合作项目（2018HH0072） |
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| Author | Institution |
| DANG Lin-yuan | School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
| LU Yao-hui | School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
| LU Chuan | School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
| ZHU Sheng-chang | School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
| BI Wei | School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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| 中文摘要: |
| 目的 为获得合适的裂解力，以某款轿车发动机连杆为研究对象，应用扩展有限元法（Extended Finite Element Method，XFEM）对裂解工艺中的裂解力进行计算分析。方法 根据部件的实际尺寸建立预制初始微裂纹条件下的连杆裂解有限元模型，确定相关的材料参数，并进行有限元网格划分，确定部件之间的约束类型。以应力强度因子大于材料断裂韧度，裂纹即扩展为依据，反复试算得出应力强度因子达到断裂韧度时的裂解力，进而通过大量计算和数据拟合得出初始微裂纹长度与裂解力之间的关系。分析裂解力对塑性区的影响，为裂解力阈值确定给出参考。结果 当裂解力能够满足裂解工艺要求时，预制的初始微裂纹长度应尽可能小。结论 最为理想的裂解力为材料断裂韧度对应的裂解力。文中提出的分析方法也适合于求解各类连杆的裂解力。 |
| 英文摘要: |
| 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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