摘要
The fatigue performance of a workpiece depends on its surface quality.In traditional fatigue life prediction,the effect of surface quality is commonly accounted for by using empirical correction factors,which is imprecise when safety is of great concern.For surface quality,the surface topography is an important parameter,which introduces stress concentration that reduces the fatigue life.It is not feasible to test the stress concentration of different surface topographies.On the one hand,it is time-consuming and high-cost,and on the other hand,it cannot reflect the general statistical characteristics.With the help of surface reconstruction technology and interpolation method,a more efficient and economic approach is proposed,where FE simulation of workpiece with the reconstructed surface topography is used as a foundation for fatigue life prediction.The relationship between surface roughness(Sa)and fatigue life of the workpiece is studied with the proposed approach.
本文研究工件三维表面形貌的应力集中效应对工件疲劳寿命的影响。通过实验测试不同表面三维微观形貌的应力集中影响是不合适的,一方面需要大量的时间和成本,另外一方面单个工件的表面形貌不能反应统计特征。因此,本文提出一种更经济、更有效的方法基于表面重构技术和插值技术:利用重建后插值得到的工件三维表面形貌采用有限元方法进行受力分析,将应力云图结果作为疲劳寿命预测的基础,研究了工件表面粗糙度Sa与工件疲劳寿命之间的关系。
基金
Projects(51535012,U1604255)supported by the National Natural Science Foundation of China
Project(2016JC2001)supported by the Key Research and Development Project of Hunan Province,China
作者简介
Corresponding author:TANG Jin-yuan,PhD,Professor;Tel:+86–88877746;E-mail:jytangcsu@163.com
