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http://dx.doi.org/10.14481/jkges.2011.12.11.9

A Study on Non-destructive Stress Measurement of Steel Plate using a Magnetic Anisotropy Sensor  

Kim, Daesung (경일대학교 지반방재센터)
Moon, Hongduk (경남과학기술대학교 건설환경공과대학 토목공학과)
Yoo, Jihyeung (경일대학교 건설공학부)
Publication Information
Journal of the Korean GEO-environmental Society / v.12, no.11, 2011 , pp. 71-77 More about this Journal
Abstract
Recently, non-destructive stress measurement method using magnetic anisotropy sensor has been applied to the construction site such as steel bridges and steel pipes. In addition, steel rib used in the tunnel construction site was found to be possible to measure the stress by non-destructive method. In this study, steel loading experiments using magnetic anisotropy sensor developed in Japan and strain gauges were conducted to derive stress sensitivity curve for domestic steel SS400. Also, additional steel loading experiments and numerical analysis were performed for evaluation of applicability for non-destructive stress measurement method using magnetic anisotropy sensor. As a result of this study, stress sensitivity curves for domestic steel SS400 were derived using output voltage measured by magnetic anisotropy sensor and average of stress measured by strain gauges depending on the measurement location. And as a result of comparing additional steel loading experiments with the numerical analysis, error level of magnetic anisotropy sensor is around 20MPa. When considering the level of the yield stress(245MPa) of steel, in case of using magnetic anisotropy sensor in order to determine the stress status of steel, it has sufficient accuracy in engineering. Especially, magnetic anisotropy sensor can easily identify the current state of stress which considers residual stress at steel structure that stress measurement sensor is not installed, so we found that magnetic anisotropy sensor can be applied at maintenance of steel structure conveniently.
Keywords
Magnetostriction; Magnetic anisotropy; Non-destructive; Stress measurement; Steel structure;
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