材料粘弹性的空气耦合超声技术与评价方法
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摘要
针对当前材料粘弹性主要评价方法存在的不足,引入了具有非接触、完全无损等特点的空气耦合超声评价技术。基于材料粘弹性理论和空气耦合超声基本原理,提出了空气耦合超声检测进行材料粘弹性评价的理论与方法,通过测量反射系数、波速和衰减系数等参数来计算得到材料的存储模量、损耗模量和损耗角正切值。开展了空气耦合超声评价材料粘弹性的实验研究,并与成熟DMA实验进行了对比验证,结果吻合良好,证明了空气耦合超声技术评价材料粘弹性的先进性和准确性。
In view of the deficiencies of the main evaluation methods of viscoelasticity,the air-coupled ultrasonic evaluation technology was introduced with the characteristics of non-contact and nondestructive. Based on the theory of viscoelasticity and air-coupled ultrasonic,the theory and experimental method of the air-coupled ultrasonic evaluation for viscoelsaticity were proposed. The storage modulus,loss modulus and loss angle tangent were achieved through the measurement of reflection coefficient,wave velocity and attenuation coefficient. The testing study of air-coupled ultrasonic evaluation for viscoelasticity was carried out,the method was compared with the DMA testing,the results were very consistent. The advancement and accuracy of air-coupled ultrasonic evaluation for viscoelsaticity was proved.
In view of the deficiencies of the main evaluation methods of viscoelasticity,the air-coupled ultrasonic evaluation technology was introduced with the characteristics of non-contact and nondestructive. Based on the theory of viscoelasticity and air-coupled ultrasonic,the theory and experimental method of the air-coupled ultrasonic evaluation for viscoelsaticity were proposed. The storage modulus,loss modulus and loss angle tangent were achieved through the measurement of reflection coefficient,wave velocity and attenuation coefficient. The testing study of air-coupled ultrasonic evaluation for viscoelasticity was carried out,the method was compared with the DMA testing,the results were very consistent. The advancement and accuracy of air-coupled ultrasonic evaluation for viscoelsaticity was proved.
引文
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[2]Gomez T E,Arenas A.Acoustic impedance matching of piezoelectric transducers to the air[J].IEEE Ultrasonics,Ferroelectrics,and Frequency Control,2004,51(5):624-633.
[3]Noble R A,Jones A D R,Robertson T J,et al.Novel wide bandwidth micromachined ultrasonic transducers[J].IEEE Ultrasonics,Ferroelectrics,and Frequency Control,2001,48(6):1495-1507.
[4]Turo A,Salazar J,Chavez J A,et al.Ultra-low noise front-end electronics for air-coupled ultrasonic non-destructive evaluation[J].NDT&E International,2003,36(2):93-100.
[5]Yanez Y,Garcia-Hernandez M J,Salazar J,et al.Designing amplifiers with very low output noise for high impedance piezoelectric transducers[J].NDT&E Inernational,2005(38):491-496.
[6]Gan T H,Hutchins D A,Green R J.A swept frequency multiplication technique for air-coupled ultrasonic NDE[J].IEEE Ultrasonics,Ferroelectrics,and Frequency Control,2004(51):1271-1279.
[7]Berriman J R,Hutchins D A,Neild A,et al.The application of timefrequency analysis to the air-coupled ultrasonic testing of concrete[J].IEEE Ultrasonics,Ferroelectrics,and Frequency Control,2006,53(4):768-776.
[8]周正干,魏东,向上.空气耦合超声检测中衰减因素的研究[J].中国机械工程,2010,21(19):2350-2354.ZHOU Zheng Gan,WEI Dong,XIANG Shang.Research on attenuation factor of air-coupled ultrasonic festing[J].China Mechanical Engineering,2010,21(19):2350-2354(In Chinese).
[9]周正干,魏东.空气耦合式超声波无损检测技术的发展[J].机械工程学报,2008,44(6):10-14.ZHOU Zheng Gan,WEI Dong.Progress of air-coupled ultrasonic non-destructive testing technology[J].Journal of Mechanieal Engineering,2008,44(6):10-14(In Chinese).
[10]周正干,马保全,孙志明,等.空气耦合超声检测中脉冲压缩方法的参数选优[J].北京航空航天大学学报,2015,41(1):1-7.ZHOU Zhong Gan,MAO Bao Quan,SUN Zhi Ming,et al.Parameter optimization of pulse compression method in air-coupled ultrasonic testing[J].Journal of Beijing University of Aeronautics and Astronautics,2015,41(1):1-7(In Chinese).
[11]Sergio J S,Roman F,Jurg N,et al.Novel slanted incidence aircoupled ultrasound method for delamination assessment in individual bonding planes of structural multi-layered glued timber laminates[J].Ultrasonics,2013(53):1309-1324.
[12]常俊杰,卢超,川嶋紘一郎.非接触空气耦合超声波的材料无损评价与检测[J].浙江理工大学学报(自然科学版),2015,33(4):532-536.CHANG Jun Jie,LU Chao,Kawashima K.Nondestructive material evalution and testing based on non-contact air-coupled ultrasonics[J].Journal of Zhejiang Sci-Tech University(Natural Science Edition),2015,33(4):532-536(In Chinese).