Abstract： In view of the r-value fluctuation caused by the tracking abnormality of the width extensometer in the laboratory， the data characteristics of the r-value abnormality in the use of the mechanical width extensometer were analyzed. The linear fitting method was used to fit the measurement data of mechanical width extensometer. The curve of r-value was fitted by deriving the data of width deformation in the tensile process of testing machine. The measurement error of mechanical extensometer was eliminated by subtracting Δb value from r value curve formula. Compared with the results of optical extensometer， the accuracy of this method was higher.
徐 雁， 孙志鹏， 宋祖峰. 线性拟合法消除宽度引伸计r值异常[J]. 物理测试, 2020, 38(1): 28-.
XU Yan， SUN Zhi-peng， SONG Zu-feng. Elimination of r-value anomaly of width extensometer by linear fitting method. PHYSICS EXAMINATION AND TESTING, 2020, 38(1): 28-.
2020, Vol. 38 
