Mechanical Engineering and Technology
Vol.3 No.03(2014), Article ID:14068,6 pages
DOI:10.12677/MET.2014.33011

Early Stress Fatigue Analysis of the Taper-Leaf Spring

Long Cheng1, Junjie Cui1, Xiaowei Shan1,2

1North University of China, Taiyuan

2Shandong Fangcheng Auto Suspension Technology Co., LTD, Zibo

Email: jing_hun_ok@163.com

Received: Jul. 11th, 2014; revised: Aug. 5th, 2014; accepted: Aug. 13th, 2014

ABSTRACT

Due to its light weight and low costing, taper-leaf spring has been widely used in automobiles, especially in commercial vehicles. However, the early stress fatigue fracture problem is always in the designation of the taper-leaf spring and conventional design methods cannot solve the problem well. According to the basic design parameters of the taper-leaf spring used in some models which have fracture problems, some 3D simplified models with different materials and different parabola coefficients are set up in CATIA. Then, these models are put into the software of finite element analysis—ANSYS to calculate and output the results of displacement and Von-Mises stress. In the end, plenary statics analysis is done to the input models. For taper-leaf spring, the stress fatigue most likely occurs in its parabolic part and its root, which are the vulnerable spots of the leaf spring designation. The analysis results indicate that the CAE technology based on finite element analysis can be a better solution and provides a basis for the performance optimization design of the actual production of the leaf spring.

Keywords:Taper-Leaf Spring, Early Stress Fatigue, CAE Analysis, Performance Optimization Design

1中北大学，太原

2山东方成汽车悬架科技有限公司，淄博

Email: jing_hun_ok@163.com

1. 引言

2. 建立三维计算模型

3. 静力分析设置

Figure 1. 3D model of the taper-leaf spring

Figure 2. Grid model of the taper-leaf spring

4. 仿真结果分析

4.1. 原设计方案静力位移和应力分析

Figure 3. Y-axis displacement of the taper-leaf spring under full load

Figure 4. Von-Mises of the taper-leaf spring under full load

4.2. 板簧优化设计对比分析

4.2.1. 优化方案一仿真对比分析

4.2.2. 优化方案二仿真对比分析

Figure 5. Y-axis displacement of the optimized plate spring under full load

Figure 6. Von-Mises of the optimized plate spring under full load

Figure 7. Y-axis displacement of the optimized plate spring under full load

Figure 8. Von-Mises of the optimized plate spring under full load

Table 1. Theory and simulation performance parameter table

5. 结论

1. [1]   陈耀明 (2012) 汽车悬架论文集. 苏州大学出版社, 苏州.

2. [2]   郑银环 (2005) 汽车钢板弹簧计算模型研究. 武汉理工大学, 武汉.

3. [3]   邹海荣, 黄其柏 (2004) 国内外汽车钢板弹簧设计与分析方法的发展进程. 上海汽车, 7, 37-39.

4. [4]   邹海荣, 黄其柏 (2003) 基于非线性的汽车钢板弹簧断裂问题分析. 华中科技大学学报, 3, 96-98.

5. [5]   刘鸿文 (2010) 材料力学. 第五版, 高等教育出版社, 北京.

6. [6]   郭洪强, 李衡, 郭世永 (2006) 汽车钢板弹簧的接触有限元分析. 湖北汽车工业学院学报, 2, 11-13.

1) 刚度公式：

2) 根部应力公式：

3) 抛物线处应力：