喷丸强化对提高汽车扭力梁疲劳寿命的研究

发布时间：2018-01-28 07:08

本文关键词： 喷丸扭力梁后桥弯曲疲劳扭转疲劳　出处：《锻压技术》2016年04期 　论文类型：期刊论文

【摘要】：随着汽车轻量化的发展趋势,扭力梁后桥以其独有的特点被广泛应用于紧凑型轿车,但在其应用中,存在横梁处应力高、易产生疲劳等缺点。以U型扭力梁后桥为研究对象,介绍了悬架的种类,以及弯曲、扭转疲劳实验设备和台架实验方案;选取实验得出的相对较优的喷丸工艺,对轻量化设计的扭力梁后桥横梁进行喷丸强化;并对喷丸前后的扭力梁后桥分别进行弯曲、扭转疲劳实验,研究了喷丸强化对扭力梁后桥横梁处弯曲、扭转疲劳特性的影响。结果表明,喷丸强化能够明显提高扭力梁后桥的疲劳寿命,尤其是扭转疲劳寿命,在S=±30 mm、S=±40 mm两种位移负荷水平下,喷丸强化扭力梁疲劳寿命分别为未强化试样的2倍和4倍。最后,从喷丸强化后试件的微观组织、应力变化、硬度和裂纹源及其扩展这4个方面分析了喷丸强化提高扭力梁后桥横梁疲劳寿命的原因。
[Abstract]:With the development trend of automobile lightweight, the rear axle of torsion beam is widely used in compact car because of its unique characteristics, but in its application, there is high stress at the crossbeam. Taking the rear axle of U-type torsion beam as the research object, this paper introduces the types of suspension, bending and torsional fatigue test equipment and bench test scheme. Selecting the relatively optimal shot peening technology obtained from the experiment, shot peening strengthening is carried out on the light-weight design of the crossbeam of the torsion beam rear bridge. The effect of shot peening on the bending and torsional fatigue of the rear bridge of torsion beam before and after shot peening is studied. The results show that the effect of shot peening on the bending and torsional fatigue characteristics of the crossbeam is studied. Shot peening can obviously improve the fatigue life of the rear axle of the torsion beam, especially the torsional fatigue life, at the displacement load level of S = 卤30 mm and S = 卤40 mm. The fatigue life of the shot peening strengthened torsion beam is 2 times and 4 times of that of the unstrengthened specimen respectively. Finally, the stress changes from the microstructure of the specimen after shot peening. The causes of increasing fatigue life of the rear axle beam of torsion beam by shot peening strengthening are analyzed in the four aspects of hardness and crack source and its propagation.
【作者单位】：华东交通大学载运工具与装备教育部重点实验室;江西昌河汽车有限责任公司;
【基金】：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)
【分类号】：TG668
【正文快照】： 喷丸是一种简单、有效的表面强化方法,其原理是利用高速运动的弹丸流冲击金属材料表面,使材料表面产生不均匀的塑性变形,且引入残余压应力场,提高零部件的强度和寿命。对5Cr Ni Mo芯辊[1]、Ti-10V-2Fe-3Al钛合金[2]等作喷丸强化处理后其疲劳性能都不同程度地得到了提高,疲劳寿

【相似文献】