Performance Comparison of Magnetic Anisotropy Sensor for Tensile and Bending Stresses

The magnetic anisotropy sensor (MAS) enables the noncontact measurement of mechanical stresses in ferromagnetic materials. The output voltage from the MAS is due to the inverse magnetostriction effect. To measure a tensile or bending stress, a MAS output voltage vs. stress characteristic is needed for each type of stress. This paper deals with the relationship of the MAS output voltages for tensile and bending stresses. The output voltage from bending stress is calculated using the output voltage ratio and output voltage vs. tensile stress characteristics. Thus a MAS can measure both tensile and bending stresses using an output voltage vs. tensile stress characteristic.