摘要
通过商用车实车道路试验,对少片钢板弹簧型疲劳裂纹扩展进行研究。经减速带冲击工况试验得到板簧应力和疲劳裂纹扩展速率最大处,用此位置和距中心螺栓孔16mm处粘贴的应变片实时采集板簧应力,同时使用位移传感器实时采集中心螺栓孔相对车架位移。基于裂纹尖端附近应力场及应力强度因子的方法对数据进行分析,最终完成7种工况的实车道路试验。结果表明:距中心螺栓孔116mm处的疲劳裂纹扩展速率较大,与此类钢板弹簧容易发生疲劳故障的位置吻合。通过理论分析与试验验证此方法可以应用于板簧裂纹扩展速率预测。
The research on the growth of mode fatigue crack for taper-leaf spring is exacted by road tests on a commercial vehi⁃cle.The position,where the stress and fatigue crack growth rate of the leaf spring is maximum,is obtained by the impact test of the deceleration belt.The stress of the leaf spring is collected in real time with the strain gauges pasted at the above positionand the position 16 mm away from the center bolt hole.At the same time,a displacement sensor is adopted to achieve the realtime ac⁃quisition of the displacement of center bolt hole,which is relative to the frame.And the data is analyzed based on the method of stress field and stress intensity factor of crack tip nearby.The road test under seven working conditions is completed in the end.The results show that the larger the rate of fatigue crack’s growth of 116mm from the center bolt hole,the easier the coincidence of the location of fatigue failure for leafspring of this type.Hence,through theoretical analysis and experimental verification,this meth⁃od can be applied to the growth rate prediction of leaf spring crack.
作者
刘成贵
武志斐
LIU Cheng-gui;WU Zhi-fei(College of Mechanical and Vehicle Engineering of Taiyuan University of Technology,Shanxi Taiyuan 030024,China)
出处
《机械设计与制造》
北大核心
2021年第11期10-14,18,共6页
Machinery Design & Manufacture
基金
山西省科技攻关计划(20181102006)。
