A Study on Influence of Plastic Deformation on the Global Conductivity and Permeability of Carbon Steel

摘要

In this paper, experimental and numerical studies were conducted to investigate the electromagnetic property variations of carbon steels due to plastic strains. A series of specimens were fabricated and uniform global plastic strains of different levels were introduced to them by tensile tests. Measurements using the four-point probe method were carried out and the results were analyzed to obtain the conductivity change. It is found that the macro conductivity is not affected significantly by the plastic strain once taking into account the thickness change of specimen. Through numerical analysis with a code of reduced A method, it is also proved that the eddy current signal change of damaged test-pieces is mainly due to the permeability variation, which gives a good possibility to predict plastic damage with magnetic method.