摘要
针对一种磨削表面微观形貌的应力集中问题提出了一种应力集中系数的精确计算方法。通过实验观察磨削工件表面微观形貌在进给方向具有沟壑状形貌特征,采用缺口模型分析计算磨削表面微观形貌应力集中系数;提出基于二维表面轮廓数据的缺口表征参数计算方法,建立无限大平面缺口模型并采用迭代法对模型进行修正,并用有限元方法进行对比验证。针对磨削表面微观形貌的应力集中系数与缺口模型特征参数-缺口的宽度、深度和谷底半径的定量关系,提供了对应的经验公式。研究工作为磨削表面微观形貌与应力集中系数关联规律研究提供一种定量计算方法,对分析磨削工件表面微观形貌的疲劳性能具有基础作用。
The model for calculating the stress concentration factor surface micro topography in the grinding was studied.Notched model is used to calculate the stress concentration factor of surface micro topography in grinding of workpiece by observing the characteristics of gully in the feed direction;a method to calculate the characteristic parameters of the notch based on the 2D profile data is proposed,and notched model for infinite plane is established,which is modified by iteration method,and finite element method is used to verify the present method.The quantitative relationship between the stress concentration factor of surface micro topography in grinding and the characteristic parameters of notch model-width,depth and valley root radius was studied by obtaining empirical formula.The results supply a quantitative calculation method for studying the relationship between the grinding surface micro topography and the stress concentration factor,it has basic function in the analysis of fatigue performance of surface micro topography in the grinding of workpiece.
作者
孙甲尧
郭紫贵
赵学清
李秀兰
罗静
Sun Jiayao;Guo Zigui;Zhao Xueqing;Li Xiulan;Luo Jing(School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;Zhangjiajie Institute of Aeronautical Engineering, Hu′nan Zhangjiajie 427000, China)
出处
《机械科学与技术》
CSCD
北大核心
2020年第3期379-384,共6页
Mechanical Science and Technology for Aerospace Engineering
基金
湖南省自然科学基金项目(2019JJ70035)
湖南省教育厅科学研究项目(18C1779、11C1289)资助。
关键词
磨削表面
微观形貌
缺口
应力集中
grinding surface
micro topography
notch
stress concentration factor
