Stress response of Barkhausen noise in high carbon steel cables and ropes

Abstract

Stress response of three magnetic parameters related to Barkhausen noise (BN) for three types of steel concrete reinforcement cables, in as-delivered and heat treated conditions, and three steel ropes, in the as-delivered state, is investigated. In all materials, rms value of BN and peak voltage of noise burst steadily decrease as a function of tensile stress up to a level of 1000 MPa, whereas peak position of noise burst is simultaneously delayed on the time axis, indicating an increase in coercive force. Stress response of rms and peak voltage of noise is strong in all reinforcement cables but weaker in ropes. Stress dependence of magnetic parameters is caused by the stress gradient effect at high stresses and at low stresses, either by 〈110〉 wire texture or by a decrease in mobility of Bloch walls oriented along the cementite lamellae or rows and, simultaneously, along the cables or ropes.