Transactions of Materials and Heat Treatment

Title：Fracture analysis and optimization design of steering tie rod 42CrMo

Authors： Ji Zhengbo Jian Baozhu Sun Jianjun

Unit： Jiangsu Vocational and Technical Collage of Finance & Economics Nanjing Forestry UniversityChina National Heavy Duty Truck Group Co. Ltd.

KeyWords： steering tie rod fracture failure finite element analysis 42CrMo

ClassificationCode：O317

year,vol(issue):pagenumber：2015,40(12):136-140

Abstract：

Fracture failure analysis of steering tie rod 42CrMo was conducted by chemical composition analysis, hardness test and macro-micro and force analysis of fracture region. The results show that the failure is caused by fatigue fracture under alternative load and the fatigue fracture results directly from severe stress concentration. The influence of structure parameters on the stress concentration is analyzed by the finite element software ANSYS Workbench, orthogonal experiment design and variance analysis method, and it is showed that the gap size A of the tie rod is the main factor resulting in increasing of stress concentration. After optimization design, the stresses of the fracture region are reduced by 20.89% and 13.72% respectively. The bulk-production tie rod appears no fracture failure again after the optimization of structure parameters, which meets the production requirement.

Funds：

国家自然科学基金资助项目（51375245）；淮安市科技支撑项目（SN13065）

作者简介：嵇正波（1983- ），男，博士研究生，讲师

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