磁気的性質を利用したSM490鋼の残留ひずみの測定法に関する研究

概要

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In order to establish a nondestructive method of estimating residual strains induced in structural components for buildings, the magnetization properties of stress-imposed SM490A steel were measured, using a tensile tester equipped with a single sheet tester. In this measurement, the correlation between the magnetization properties such as the coercive force and the permeability and the mechanical properties such as the stress and the strain was discussed. In order to confirm the degree of deterioration, the magnetization properties were estimated compared with the dislocation density. The magnetization properties were measured when repeated stress was loaded to simulate the stress applied by the earthquake and the wind. Monotonic decrease and increase as functions of the tensile strain are observed in the permeability and the coercive force, respectively. These findings suggest that changes in the permeability and the coercive force with strains can be used for nondestructive estimation of deterioration of structural materials.
社団法人日本建築学会の論文
2000-04-30