计算机断层成像法预测在役车轮的疲劳寿命  

Fatigue Life Evaluation of Wheel in Service Using Industrial Computed Tomography

作　　者：李林升[1,2] 曾理[1] 段黎明[1] 张金波[3] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室ICT研究中心,重庆400044 [2]南华大学机械工程学院,衡阳421001 [3]中冶赛迪工程技术股份有限公司,重庆400013

出　　处：《机械设计与研究》2010年第2期64-68,共5页Machine Design And Research

基　　金：国家自然科学基金资助项目(60672098)

摘　　要：弯曲疲劳寿命是车轮重要的性能指标,目前其预测方法只适用于车轮的设计模型,没有考虑车轮的磨损、变形、损伤等的影响,不能应用于在役车轮。首先用工业计算机断层成像技术对在役车轮进行扫描,得到其切片图像;在运用高斯滤波函数对切片图像预处理后,采用移动立方体方法重建三维表面;接着运用顶点删除法和Laplacian算法简化和平滑三维表面;将三维表面模型导入UG进行处理得到三维CAD模型;最后借助于有限元方法,通过模拟在役车轮工况,建立边界条件,得到在役车轮的应力分布,并运用名义应力法预测在役车轮的疲劳寿命。结果表明根据工业CT数据可以快速并精确地重建在役车轮的三维CAD模型,确定其危险部位,实现疲劳寿命预测。Bending test was the most important performance test of the wheel.At present,the fatigue life prediction was only applied to design model of the wheel and not the wheel in service,because the effect of abrasion,distortion and damage for wheel had not been considered in present.Firstly,the wheel was scanned to get a sequence of industrial Computed Tompography（CT） images.After the CT images were processed by Gaussian filter,the 3-D surface model was reconstructed from the CT images by using Marching Cubes（MC） algorithm,and then simplified and smoothed by Vertex Removing（VR） algorithm and Laplacian algorithm respectively.Then the 3-D surface model was processed by the software UG.Finally,based on finite element method,the stress distribution of the wheel was acquired by simulating its work condition and building up a boundary condition.Besides,the fatigue life of the wheel was predicted with nominal stress approach.The results show that the 3-D CAD model of the wheel can be rebuilt quickly and accurately according to its industrial CT data.The dangerous parts of the wheel can be located and the fatigue life prediction of the wheel is realized.

关 键 词：车轮 计算机断层成像(CT) 疲劳寿命 有限元分析 

分 类 号：U463.34[机械工程—车辆工程]