作者：任仙芝, 任尚坤, 樊清泉

作者单位：南昌航空大学 无损检测技术教育部重点实验室, 江西 南昌 330063

关键词：无损检测;磁导率检测;铁素体不锈钢;激励源;线圈匝数;拉应力

摘要：

磁导率检测技术是一种可高精度评价铁磁构件整体或部分区域应力集中、疲劳损伤状况的无损检测方法。依据磁导率检测原理，以430铁素体不锈钢试件为研究对象，研究激励电压幅值、激励线圈匝数、检测线圈匝数及外加拉应力对检测传感器最优激励频率的影响。研究发现，最优检测频率随激励线圈匝数的增加而减小；最优检测频率与外加拉应力有关，当外加拉应力超出试件的弹性变形阶段时，最优频率随拉应力的增大而增大；最优检测频率不随激励电压幅值、检测线圈匝数的变化而变化，但随着激励电压幅值、检测线圈匝数的增加，检测灵敏度升高。该研究结论可为灵敏传感器的设计提供参考。

Research on optimal excitation frequency of 430 stainless steel components detection based on permeability testing technology
REN Xianzhi, REN Shangkun, FAN Qingquan
Key Laboratory of Nondestructive Testing of Ministry of Education, Nanchang Hangkong University, Nanchang 330063, China
Abstract: The permeability testing technology is a non-destructive testing method that can evaluate the stress concentration and fatigue damage of the whole or part of the ferromagnetic component with high precision. Based on the principle of permeability detection, taking 430 ferritic stainless steel specimen as the research object, the effects of the excitation voltage amplitude, the number of turns of the excitation coil, the number of turns of the detection coil, and the tensile stress on the optimal excitation frequency of the detection sensor were studied. The study shows that the optimal detection frequency decreases with the increase of the number of turns of the exciting coil; The optimal detection frequency is related to the external tensile stress, and when the external tensile stress exceeds the elastic deformation stage of the test piece, the optimal frequency increases as the tensile stress increase; The optimal detection frequency does not change with the excitation voltage amplitude, the number of turns of the detection coil, but with the increase of the excitation voltage amplitude, the detection coil turns, the detection sensitivity increases. The conclusion of this study can provide reference for the design of sensitive sensors.
Keywords: non-destructive testing;permeability testing;ferritic stainless steel;excitation source;coil turns;tensile stress
2019, 45(8):38-43  收稿日期: 2018-05-14;收到修改稿日期: 2018-07-22
基金项目: 国家自然科学基金资助项目（51865039）
作者简介: 任仙芝(1992-),女,河南周口市人,硕士研究生,专业方向为磁导率无损检测
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