Transactions of Materials and Heat Treatment

Title：Research on the influence of shot peening strengthening on improving the fatigue life of torsion beam of auto

Authors： Huang Zhichao1 Guan Changhai1 Lv Shiliang1 2 Zhang Yongchao1

Unit： 1.Key Laboratory of Conveyance and Equipment (East China Jiaotong University) Ministry of Education 2. Jiangxi Changhe Automobile Co. Ltd.

KeyWords： shot peening torsion beam rear axle bending fatigue torsion fatigue

ClassificationCode：

year,vol(issue):pagenumber：2016,41(4):115-121

Abstract：

With the trend of automotive lightweighting, the torsion beam rear axle is widely used in compact cars owing to its unique characteristics. However, the beam has shortcomings such as high stress and easy fatigue failure. For U type torsion beam rear axle, the suspension types，equipment of bending and torsion fatigue tests as well as bench tests plan were introduced. Then, the torsion beam rear axle crossbeam after lightweight design was strengthen by relative optimal shot peening technology, and the bending and torsion fatigue tests of the torsion beam rear axle before and after shot peening were conducted. Furthermore,the influences of shot peening strengthening on bending and torsion fatigue characteristics of the torsion beam rear axle crossbeam were researched. The results show that the fatigue life, especially the torsion fatigue life, can be improved significantly by shot peening strengthening. Under the two displacement load conditions of S=±30 mm and S=±40 mm, the torsion fatigue life of torsion beam rear axle crossbeam is strengthened by 2 and 4 times. Finally，the reasons of fatigue life of torsion beam strengthened by shot peening were analyzed from four aspects of microstructure，stress change，hardness，source of crack and extension for shot peening strengthened sample.

Funds：

国家自然科学基金资助项目(51565014)；江西省高等学校科技落地计划项目(KJLD13035)；江西省赣鄱英才555工程领军人才培养计划（赣才字［2012］1号）

黄志超（1971-），男，博士，教授

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