摘要
作为评估铁磁材料性能及应力状态的重要无损检测技术之一,磁巴克豪森噪声方法可实现对材料早期结构损伤及相关应力状态的定量评价,应用前景广阔.此方法能否准确评估材料内部损伤及应力状态,关键在于能否建立合理有效的检测信号与材料内部应力分布之间的关系.为此,本文以铁磁板为例,沿板厚度方向激发信号,根据磁巴克豪森信号传播过程中的强度衰减效应,建立了铁磁板表面磁巴克豪森信号与材料内部应力定量关系的解析模型.基于已有实验结果的研究证实,本文理论模型能准确反映不同检测频率下铁磁板内部均匀应力值差异对检测信号的影响.而且,对于铁磁板内存在应力分布的情形,采用本文解析模型,研究得到了板内应力分布、铁磁板厚度、磁导率和电阻率等主要参数对铁磁板表面检测信号的影响规律.本文理论模型不仅揭示了基于磁巴克豪森噪声方法的铁磁材料应力检测机理,同时也为发展磁巴克豪森无损检测技术提供了合理有效的理论依据.
As one of the important non-destructive testing techniques for evaluating material performance degradation and stress state,magnetic Barkhausen noise(MBN)has broad application prospects.Clarifying the relationship between internal stress distribution and detection signal can provide important guidance for evaluating the stress state of material based on the MBN signal.In this work,by constructing the expression of Barkhausen noise excitation intensity related to stress value,combining with the signal attenuation effect during signal propagation,and using the layered model along the thickness direction,we establish the analytical model of MBN signal on the surface of the ferromagnetic plate with internal stress distribution.Based on the existing experimental results,it is confirmed that the proposed model can reflect the effects of the different uniform stresses in the ferromagnetic plate on the signal at different detection frequencies.For the ferromagnetic plate with internal stress distribution,the effects of its stress distribution,magnetic conductivity,electrical resistivity,and thickness on the surface MBN signal are discussed in detail based on the proposed model.The theoretical analysis in this work can be applied to the testing mechanism analysis of the MBN stress evaluation method.
作者
张召泉
时朋朋
苟晓凡
Zhang Zhao-Quan;Shi Peng-Peng;Gou Xiao-Fan(College of Mechanics and Materials,Hohai University,Nanjing 211100,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第9期302-310,共9页
Acta Physica Sinica
基金
国家自然科学基金(批准号:11802225,12072101)资助的课题。
关键词
磁巴克豪森噪声
无损检测
应力分布
解析模型
magnetic Barkhausen noise
non-destructive testing
stress distribution
analytical model
