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Mechanical Engineering and Technology 机械工程与技术, 2014, 3, 83-90 Published Online September 2014 in Hans. /journal/met /10.12677/met.2014.33011 Early Stress Fatigue Analysis of the Taper-Leaf Spring 1 1 1,2 Long Cheng , Junjie Cui , Xiaowei Shan 1 North University of China, Taiyuan 2 Shandong Fangcheng Auto Suspension Technology Co., LTD, Zibo Email: jing_hun_ok@163.com th th th Received: Jul. 11 , 2014; revised: Aug. 5 , 2014; accepted: Aug. 13 , 2014 Copyright © 2014 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract Due to its light weight and low costing, taper-leaf spring has been widely used in automobiles, es- pecially 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 prob- lem 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 fa- tigue 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 elemen