应用X射线衍射法测定轴类工件中的残余应力  

Measuring Residual Stress in Axial Workpiece by X-Ray Diffraction Method

作　　者：李益华[1] 吴运新[1] 龚海[1] 李泉 张澄 王晓燕[1] 吴中怀[1] 

机构地区：[1]中南大学机电工程学院,长沙410083 [2]株洲天力锻业有限公司,株洲412001

出　　处：《机械工程材料》2012年第7期96-99,共4页Materials For Mechanical Engineering

基　　金：国家重点基础研究发展规划"973"项目(2010CB731703)

摘　　要：根据测试距车轴表面2mm深度处残余应力的要求,推导了剥层测残余应力的修正公式,利用生死单元法模拟了车轴车削的过程,验证了该修正公式的正确性,并采用X射线衍射法测定了距某车轴表面2mm深度处的轴向和周向残余应力。结果表明:X射线衍射法和修正公式能有效测出距车轴表面2mm深度处的残余应力;轴向残余应力最大值(绝对值)和周向残余应力最大值(绝对值)分别出现在0°测点和90°测点,其值分别为-139.15MPa和-105.21MPa,轴向残余应力和周向残余应力各点的差值均小于EN13261标准规定的40MPa。According to the principle for measuring the residual stress under axle surface 2 mm, the modified formula for stripping method measuring residual stress was deduced, and the correctness of the modified formula was proved by using birth-death element method to simulate the progress Of turning the axle. The axial and circumferential residual stresses under axle surface 2 mm were tested by X-ray diffraction method. The results show that the X-ray method and modified formula could measure the residual stress under axle surface 2 ram. The maximal values of axial and circumferential residual stresses appeared at 0°and 90° test points, and their value were --139. 15 MPa and --105.21 MPa, respectively, and the differences of axial and circumferential residual stress in every points were less than EN13261 prescribed value of 40 MPa.

关 键 词：X射线衍射法 车轴 剥层修正公式 生死单元法 

分 类 号：U270.7[机械工程—车辆工程]