Influence of Defects on Stress Detection by Magnetic Barkhausen Noise

Magnetic Barkhausen noise (MBN) technique is a magnetic non-destructive testing (NDT) method widely used for stress detection of ferromagnetic materials. In the stress detection of pressure equipment such as pipelines, due to the corrosive and high-pressure operating environment, defects often coexist with stresses, which has a great influence on the detection performance of stress by MBN technology. Focusing on this issue, this work theoretically analyzes the effect of defects on MBN excitation field and stress distribution, and experimentally studies the influence of artificial defects on the evaluation of stress state by extracting MBN energy and envelope curve. The outcome reveals the possibility of using MBN technology for stress detection in defective materials. This work helps to improve the accuracy of stress detection in defective materials.