文献类型：期刊文献

英文题名：Mode conversion of Lamb waves in a composite phononic crystal plate: Numerical analysis and experimental validation

作者：Ding, Taotao[1];Song, Ailing[1];Sun, Chaoyu[1];Xiang, Yanxun[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety MOE, Shanghai 200237, Peoples R China

年份：2022

卷号：132

期号：22

外文期刊名：JOURNAL OF APPLIED PHYSICS

收录：;EI(收录号：20225113281428);WOS:【SCI-EXPANDED(收录号:WOS:000900766400002)】；

基金：ACKNOWLEDGMENTSThis work was supported by the National Key Research and Development Program of China (Grant No. 2021YFC3001802), the National Natural Science Foundation of China (NNSFC) (Grant Nos. 12104154, U1930202, and 12025403), the Shanghai Pujiang Program (Grant No. 21PJ1402400), the Natural Science Foundation of Shanghai (Grant No. 22ZR1416900), and the Young Elite Scientists Sponsorship Program by CAST (Grant No. 2021QNRC001).

语种：英文

外文关键词：Crystals - Damage detection - Fluorine compounds - Geometry - Numerical models - Phonons - Plates (structural components) - Ultrasonic waves

摘要：The mode manipulation of Lamb waves plays an important role in damage detection and identification of damage types, location, and size. In this paper, we propose a composite phononic crystal (PC) plate with antisymmetric and symmetric PCs for realizing mode conversion from A0 to S0 mode of Lamb waves. The theoretical analysis, numerical simulations, and experimental validation are introduced and the mode conversion mechanism of the composite PC plate is systematically investigated. The effect of geometrical parameters on band structures of antisymmetric and symmetric PCs is first discussed. Then multi-physics field simulation models are developed and in-plane displacement fields are obtained in numerical simulations, which shows that the mode conversion is enhanced when the period number of the antisymmetric PC decreases and that of symmetric the PC increases. The composite PC plate specimens are fabricated with precision wire cutting technology for experimental measurements and the self-designed polyvinylidene fluoride (PVDF) comb transducer is used to stimulate the Lamb waves. The experimental results are consistent with the numerical simulations, which demonstrate that the proposed composite PC plate can achieve the mode conversion from A0 to S0 mode of Lamb waves. Our proposed structures have applicable values for the mode manipulation of Lamb waves in damage detection. Published under an exclusive license by AIP Publishing.