負荷応力下でのインバー合金の磁歪特性

概要

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Magnetostriction curves of invar alloy are measured under various levels of uniaxial stress. Because of its low thermal expansion, the invar alloy is used in parts which suffer from large temperature change. To avoid the failure by thermal fatigue, thermal stress should be nondes-tructively evaluated. Since the invar alloy is ferromagnetic, the magnetization is accompanied by the magnetostriction. For ferromagnetic steel, we have already suggested to use the maximum magnetostriction in nondestructive stress measurement. If the magnetostriction of the invar slloy ahows the maximum value during the magnetization, it is expected to be used for the stress measurement. In this study, we measured stress dependence of the magnetostriction of invar alloy. We revealed that the knee point appears in the magnetostriction curve, while the maximum magnetostriction will not arise. It was found that the knee point magnetostriction and the minimum magnetostriction, which appears in the normal direction to the magnetization, can be used as parameters in the nondestructive stress measurement.
社団法人日本機械学会の論文
2000-02-25