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| Elimination of r-value anomaly of width extensometer by linear fitting method |
| XU Yan， SUN Zhi-peng， SONG Zu-feng |
| Technology Center， Maanshan Iron and Steel Co.， Ltd.， Ma'anshan 243000， China |
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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.
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Received: 15 June 2019
Published: 15 February 2020
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2020, Vol. 38 
