复合材料超声导波吸收边界参数研究
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摘要
在超声无损检测研究中,对Lamb波的传播过程进行有限元仿真有助于认识其传播特性,提高测试精度。因复合材料结构尺寸限制和各向异性等特点,仿真过程中边界反射波的出现会掩盖损伤波形,影响测试结果。为抑制反射波,吸收边界的设置就显得尤为重要。通过对吸收边界参数研究发现:设置瑞雷阻尼递增的多层阻尼吸收层可以有效减少边界反射波,其中吸收边界长度对吸收效果影响最大。为了有效吸收反射波,吸收边界长度应大于波长的2倍。
In the ultrasonic nondestructive testing research,the finite element simulation of the lamb wave propagation process is helpful to understand its propagation characteristics and improve the test accuracy. Due to the structural size limitation and anisotropy of the composite material,the appearance of the boundary reflection wave in the simulation process will cover the damage waveform,and the test result is to suppress the reflected wave. The setting of the absorption boundary is particularly important. In order to effectively absorb the boundary reflection,a multi-layered Rayleigh damped incremental absorption layer is added at the model boundary. By changing the parameters such as absorption length and damping maximum,it is found that the multi-layer damping absorption layer with increasing Rayleigh damping can effectively reduce the boundary reflection wave,and the absorption boundary length has the greatest influence on the absorption effect. In order to effectively absorb the reflected wave,the absorption boundary length should be larger than the wavelength of 2 times.
In the ultrasonic nondestructive testing research,the finite element simulation of the lamb wave propagation process is helpful to understand its propagation characteristics and improve the test accuracy. Due to the structural size limitation and anisotropy of the composite material,the appearance of the boundary reflection wave in the simulation process will cover the damage waveform,and the test result is to suppress the reflected wave. The setting of the absorption boundary is particularly important. In order to effectively absorb the boundary reflection,a multi-layered Rayleigh damped incremental absorption layer is added at the model boundary. By changing the parameters such as absorption length and damping maximum,it is found that the multi-layer damping absorption layer with increasing Rayleigh damping can effectively reduce the boundary reflection wave,and the absorption boundary length has the greatest influence on the absorption effect. In order to effectively absorb the reflected wave,the absorption boundary length should be larger than the wavelength of 2 times.
引文
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[11]宋成杰,郑艳萍,纪志星,等.吸波边界对Lamb波在复合材料中传播的影响研究[J].玻璃钢/复合材料,2017(8):10-14.
[12]袁媛.超声Lamb波有限元模拟及其在损伤检测中的应用[D].镇江:江苏科技大学,2012.
[13]Nieuwenhuis J H,Neumann J J,Greve D W,et al.Generation and detection of guided waves using PZT wafer transducers[J].IEEETransactions on Ultrasonics,Ferroelectrics,and Frequency Control,2005,52(11):2103-2111.
[14]蔡建,袁慎芳,张逍越,等.Lamb波双面激励方法及其在近邻损伤监测中的应用[J].南京航空航天大学学报,2010,42(1):62-67.
[15]Rajagopal P,Drozdz M.On the use of absorbing layers to simulate the propagation of elastic waves in unbounded isotropic media using commercially available finite element packages[J].NDT&E International,2012,59:30-40.
[2]何存富,郑明方.超声导波检测技术的发展、应用与挑战[J].仪器仪表学报,2016,37(8):1713-1735.
[3]Memmolo V,Pasquin N,Ricci F.Experimental characterization of a damage detection and localization system for composite structures[J].Measurement,2018,129:381-388.
[4]Xiao S,Yue Z Q,Xiao H T.Boundary element analysis of elastic fields in non-horizontally layered halfspace whose horizontal boundary subject to tractions[J].Engineering Analysis with Boundary Elements,2018,95:105-123.
[5]Shen Y F,Giurgiutiu V.Effective non reflective boundary for Lamb waves:Theory,finite element implementation,and applications[J].Wave Motion,2015,58:22-41.
[6]Pettit J R,Walker A,Cawley P,et al.A stiffness reduction method for efficient absorption of waves at boundaries for use in commercial Finite Element codes[J].Ultrasonics,2014,54(7):1868-1879.
[7]Hastings F D,Schneider J B,Broschat S L.Application of the perfectly matched layer(PML)absorbing boundary condition to elastic wave propagation[J].Journal of the Acoustical Society of America,1996,100(100):3061-3069.
[8]Skelton E A,Adams S D M,Craster R V.Guided elastic waves and perfectly matched layers[J].Wave Motion,2007,44(7-8):573-592.
[9]Liu G R,Quek Jerry S S.A non-reflecting boundary for analyzing wave propagation using the finite element method[J].Finite Elements in Analysis and Design,2003,39:403-417.
[10]Rajagopal P,et al.On the use of absorbing layers to simulate the propagation of elastic waves in unbounded isotropic media using commercially available Finite Element packages[J].NDT&E International,2012,51:30-40.
[11]宋成杰,郑艳萍,纪志星,等.吸波边界对Lamb波在复合材料中传播的影响研究[J].玻璃钢/复合材料,2017(8):10-14.
[12]袁媛.超声Lamb波有限元模拟及其在损伤检测中的应用[D].镇江:江苏科技大学,2012.
[13]Nieuwenhuis J H,Neumann J J,Greve D W,et al.Generation and detection of guided waves using PZT wafer transducers[J].IEEETransactions on Ultrasonics,Ferroelectrics,and Frequency Control,2005,52(11):2103-2111.
[14]蔡建,袁慎芳,张逍越,等.Lamb波双面激励方法及其在近邻损伤监测中的应用[J].南京航空航天大学学报,2010,42(1):62-67.
[15]Rajagopal P,Drozdz M.On the use of absorbing layers to simulate the propagation of elastic waves in unbounded isotropic media using commercially available finite element packages[J].NDT&E International,2012,59:30-40.