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第 41 卷 第 1 期             孔媛媛等: 非线性兰姆波在阶梯板中传播的有限元仿真                                           95


                                                                   photoelastic method on the propagation characteristics of
             5 结论                                                  asymmetric Lamb mode in thickness variation plate[J].
                                                                   Journal of Applied Acoustics, 2020, 39(5): 769–774.
                 本文利用有限元研究了非线性兰姆波在本构                             [4] Marical P, El-Kettani M E, Predoi M V. Guided waves in
             非线性阶梯板中的产生、传播和散射现象,并分析了                               elastic plates with Gaussian section variation: experimen-
                                                                   tal and numerical results[J]. Ultrasonics, 2007, 47(1–4):
             相关传播规律。基于均匀板中累积二次谐波滋生的
                                                                   1–9.
             现象,构建了厚度突变的阶梯板模型,研究了散射对                             [5] Schaal C, Mal A. Lamb wave propagation in a plate with
             累积二次谐波现象的影响。研究发现,阶梯板的存                                step discontinuities[J]. Wave Motion, 2016, 66: 177–189.
             在对非线性兰姆波的传播存在两点影响:其一,厚度                             [6] Pagneux V, Maurel A. Lamb wave propagation in elastic
                                                                   waveguides with variable thickness[J]. Proceedings of the
             的改变会影响 S0-S0 模式基波和二次谐波相速度的                            Royal Society A, 2006, 462(2068): 1315–1339.
             匹配程度,进而影响二次谐波的累积效应;其二,S0                            [7] Feng F, Shen J, Lin S. Scattering matrices of Lamb waves
             模式会在厚度突变处发生散射,且不发生模式转换。                               at irregular surface and void defects[J]. Ultrasonics, 2012,
                                                                   52(6): 760–766.
             随着阶梯板的厚度差增大,这两种现象对于透射二
                                                                 [8] Deng M. Cumulative second-harmonic generation of gen-
             次谐波的能量大小起到相反的作用,散射效应使得                                eralized Lamb-wave propagation in a solid waveguide[J].
             透射能量逐渐减小,但是厚度的减小使得二次谐波                                Journal of Physics D: Applied Physics, 2000, 33(3): 207.
                                                                 [9] Lima W, Hamilton M F. Finite amplitude waves in
             累积效应越来越明显,仿真结果中可以观察到透射
                                                                   isotropic elastic waveguides with arbitrary constant cross-
             二次谐波能量存在先上升后下降的趋势,在一定厚                                sectional area[J]. Wave Motion, 2005, 41(1): 1–11.
             度差处存在一个极大值。而在均匀厚度板中,累积                             [10] Hu Z, An Z, Kong Y, et al. The nonlinear S0 Lamb mode
                                                                   in a plate with a linearly-varying thickness[J]. Ultrasonics,
             二次谐波的大小只与传播距离相关。综上,阶梯板
                                                                   2019, 94: 102–108.
             中的非线性兰姆波存在两种能量转换机制,一是传                             [11] Murnaghan F D. Finite deformation of an elastic solid[M].
             播过程中基波能量向高次谐波馈入,二是阶梯板处                                New York: John Wiley, 1951.
             的反射和透射。两种机制共同作用,决定了各个模                             [12] 吴斌, 张也弛, 郑阳, 等. 超声导波有限元仿真中吸收边界设
                                                                   置及参数 [J]. 北京工业大学学报, 2013, 39(12): 1777–1783.
             态和频率的非线性兰姆波能量分配关系。                                    Wu Bin, Zhang Yechi, Zheng Yang, et al. Modeling and
                                                                   parameters of absorbing boundary for ultrasonic-guided
                                                                   wave in FE simulation[J]. Journal of Beijing University of
                            参 考     文   献                          Technology, 2013, 39(12): 1777–1783.
                                                                [13] 他得安, 刘镇清. 超声无损检测中的二维快速 Fourier 变换及
              [1] Cho Y. Estimation of ultrasonic guided wave mode con-  Wigner-Ville 变换 [J]. 无损检测, 2001, 23(7): 313–316.
                 version in a plate with thickness variation[J]. IEEE Trans-  Ta De’an, Liu Zhenqing.  Two-dimensional fast fourier
                 actions on UltrasonIcs, Ferroelectrics, and Frequency Con-  transform and wigner-ville transform in ultrasonic nonde-
                 trol, 2000, 47(3): 591–603.                       structive testing[J]. Nondestructive Testing, 2001, 23(7):
              [2] 沈意平, 朱智军, 王送来, 等. 变厚度板中 Lamb 波传播的模               313–316.
                 态转换特性 [J]. 无损检测, 2018, 40(11): 70–74.          [14] Alleyne D, Cawley P. A two-dimensional Fourier trans-
                 Shen Yiping, Zhu Zhijun, Wang Songlai, et al. Char-  form method for the measurement of propagating multi-
                 acteristic of mode conversion of Lamb wave in a plate  mode signals[J]. The Journal of the Acoustical Society of
                 with variable thinkness[J]. Nondestructive Testing, 2018,  America, 1994, 89(3): 1159–1168.
                 40(11): 70–74.                                 [15] Morvan B, Wilkie-Chancellier N, Duflo H, et al. Lamb
              [3] 张旭, 张述坤, 胡中韬, 等. 台阶板中兰姆波 A0 模式传播特性               wave reflection at the free edge of a plate[J]. The Jour-
                 的光弹研究 [J]. 应用声学, 2020, 39(5): 769–774.            nal of the Acoustical Society of America, 2003, 113(3):
                 Zhang Xu, Zhang Shukun, Hu Zhongtao, et al. Dynamic  1417–1425.
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