In this paper, the manipulation of the guided elastic waves in periodically multilayered elastic plates (PMEPs) by introducing interfacial delaminations is explored. A periodic array of interfacial delaminations (PAIDs) distributed along the direction of wave propagation is considered. The spectral element method (SEM) is adopted and applied to accurately and efficiently calculate the transmission spectra and the band structures of the symmetric and antisymmetric guided elastic waves. The central and side periodic interfacial delaminations are considered separately in this paper. Through the comparison of the band structures for the perfect PMEP and the PMEP with PAIDs, we find that not only the total frequency ranges of the band-gaps are increased significantly, but also all of the band-gaps are moved to the relatively low-frequency ranges when PAIDs exist in a PMEP. Extra band-gaps will be generated, especially some of them are in the low-frequency ranges. In addition, the presence of PAIDs in a PMEP can widen the frequency ranges where the guided waves can only propagate with a single wave mode, i.e. the symmetric wave mode or the antisymmetric wave mode. Thus, the capacity of a PMEP to block or filter the guided waves can be strengthened significantly by just intentionally introducing the interfacial delaminations or cracks, which may provide a new way for the design of novel phononic crystals.

在本文中，探索了通过引入界面分层来处理周期性多层弹性板（PMEP）中的引导弹性波。考虑沿波传播方向分布的界面分层（PAID）的周期性阵列。采用了光谱元素法（SEM），可以准确，高效地计算出对称和反对称导引弹性波的透射谱和能带结构。本文分别考虑了中央和侧面周期性界面分层。通过比较理想的PMEP和带有PAID的PMEP的频带结构，我们发现，不仅带隙的总频率范围显着增加，但是当PMEP中存在PAID时，所有带隙也会移至相对较低的频率范围。会产生额外的带隙，尤其是其中一些处于低频范围。另外，PMEP中PAID的存在可以拓宽导波只能以单波模式（即对称波模式或反对称波模式）传播的频率范围。因此，仅通过有意地引入界面分层或裂纹，就可以显着增强PMEP阻挡或过滤导波的能力，这可以为设计新颖的声子晶体提供新的途径。PMEP中PAID的存在可以扩大导波只能以单波模式（即对称波模式或反对称波模式）传播的频率范围。因此，仅通过有意地引入界面分层或裂纹，就可以显着增强PMEP阻挡或过滤导波的能力，这可以为设计新颖的声子晶体提供新的途径。PMEP中PAID的存在可以扩大导波只能以单波模式（即对称波模式或反对称波模式）传播的频率范围。因此，仅通过有意地引入界面分层或裂纹，就可以显着增强PMEP阻挡或过滤导波的能力，这可以为设计新颖的声子晶体提供新的途径。