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Non-contact Stress Measurement of Rail Steel Using a Magnetic Anisotropy Sensor

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5 Author(s)
S. Kishimoto ; Hitachi Electronics Engineering Co., Ltd. ; M. Kobayashi ; Y. Kodaira ; M. Kobayashi
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The Magnetic Anisotropy Sensors (MAS) is based on the fact that when stress is applied, the magnetic anisotropy of steel materials changes. MAS employs a small, light probe and is capable of non-contact stress measurement. This paper describes experimental results for non-contact stress measurements of rail steel. A specimen was cut from an actual 60 kg steel rail, and tensile and compressive stresses were applied using a fatigue testing machine. Good linearity of the MAS output voltage to the applied stress was observed over tensile stresses between 0 and 160 MPa when demagnetization was employed.

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IEEE Translation Journal on Magnetics in Japan  (Volume:5 ,  Issue: 9 )