Theoretical analysis and experimental verification of magneto-mechanical effect for loaded ferromagnetic structure with initial corrosion

Abstract

The influential mechanism between corrosion self-magnetic flux leakage and magneto-mechanical effect of ferromagnetic material is an urgent problem for the corrosion diagnosis of loaded cable structures. This study established the SMFL evolution basic model under different initial corrosion states, and the theoretical analysis method for the magneto-mechanical effect under various corrosion degrees was proposed. Then, the uniform corrosion experiment under increasing tensile loads was performed to verify its accuracy and availability. The results show that the tensile stress promotes the quadratic nonlinearly downward trend of the overall magnetization and the linearly downward trend of fluctuation distribution without corrosion. The magneto-mechanical effect under initial corrosion can be interpreted as the superposition of non-corrosion influence effect and corrosion-stress coupling effect. Moreover, the cubic nonlinear correlation of decreasing first and then increasing between ηx0 and σ is verified. This study provides a theoretical solution for the corrosion-stress coupling analysis of corroded and loaded cable structures.