Experimental Verification of the Linear Relationship Between Stress and the Reciprocal of the Peak Barkhausen Voltage in ASTM A36 Steel

This study presents an experimental validation of a model theory for determining the relationship between a nondestructive measurement parameter and a property of interest. It was found that the reciprocal of the peak envelope amplitude of the Barkhausen emission voltage follows a linear relationship with stress. A linear relationship between stress and the reciprocal of the root mean square voltage was also obtained. These observations represent an important step towards improving the use of Barkhausen signals for magnetic nondestructive evaluation of stress as a function of depth in ferromagnetic load bearing structures.