金属材料声发射信号传播的声阻抗特性研究  

Sound impedance characteristics of metal material’s acoustic emission signal propagation

作　　者：毛汉颖[1] 刘婷 范健文[1] 毛汉领[3] MAO Hanying;LIU Ting;FAN Jianwen;MAO Hanling(School of Mechanical and Transportation Engineering, Guangxi University of Science and Technology, Liuzhou 545006, China;Department of Equipment Manufacturing, Zhongshan Torch Vocational College of Technology, Zhongshan 528437, China;College of Mechanical Engineering, Guangxi University, Nanning 530004, China)

机构地区：[1]广西科技大学机械与交通工程学院,广西柳州545006 [2]中山火炬职业技术学院装备制造系,广东中山528437 [3]广西大学机械工程学院,南宁530004

出　　处：《振动与冲击》2019年第13期197-201,214,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51365006;51445013);广西自然科学基金项目(2016GXNSFAA380119;2018GXNSFAA138206)

摘　　要：金属材料声发射信号的传播特性是研究声发射技术的重要基础,声阻抗是表征金属材料动态特性的重要物理量,用声阻抗研究声发射信号传播特性,将有助于声发射信号在损伤检测中的应用。在综述金属材料声阻抗实测估计研究的基础上,提出了估计金属材料声发射信号声阻抗的方法,探讨了金属材料在经受荷载并卸载后以断铅声发射信号估计其声阻抗的方法。数值模拟和实验数据分析表明,通过断铅声发射可以估计材料经受荷载的声阻抗变化,金属材料声发射信号声阻抗估计值可以较好的表征声发射信号的传播特性,甚至还可能对材料经受荷载情况进行声阻抗成像,可能成为材料内部损伤检测的新方向。Sound impedance is an important physical quantity to characterize dynamic characteristics of metals. Studying propagation characteristics of acoustic emission (AE) signals using sound impedance is helpful to application of AE signals in damage detection. Here, based on reviewing studies on metal material sound impedance’s actual measurement and estimation, the sound impedance estimation method based on AE signals was proposed, and the method to estimate a metal material’s sound impedance was explored using its lead-broken AE signals after it firstly loaded and then unloaded. Numerical simulation and test data analysis showed that lead broken AE signals can be used to estimate sound impedance changes of a metal material bearing load, metal material’s sound impedance estimation value based on its AE signals can better characterize AE signal propagation characteristics;even the sound impedance imaging may be realized for a metal material bearing load process to become a new direction of material inside damage detection.

关 键 词：金属材料 声发射 声阻抗 传播特性 损伤 

分 类 号：TB52[理学—物理]