Effect of prestraining on Barkhausen noise vs. Stress relation

摘要

Mild steel specimens were uniaxially strained n tension at strain levels varying from 0.5 to 10/100 followed by X-ray diffraction residual stress and Barkhausen noise (BN) measurements. After this tension and compression loading was applied to the specimens. BN measurements were carried out during the whole reloading sequence. These measurements showed that prestrain increased the tensile stress value at which the BN saturated. The linear range of the stress vs. BN curve shifted towards the tensile stress range as a function of prestrain. In the linear range the stress sensitivity remained unchanged despite the prestrain.