題目：Surface and interface elastic waves in phononic crystals and metamaterials

報告人：Prof. Chuanzeng Zhang （University of Siegen, Germany）

時間：2018年8月20日15:00-16:00

報告地點：明故宮校區(qū)A18-807

主辦單位：機械結構力學及控制國家重點實驗室、國際合作處、科協(xié)、航空宇航學院

報告摘要：

Surface/interface waves at the interface of two dissimilar media play an important role in science and technology, as they exhibit rich physics and potential applications in both optical and acoustic systems. One type of such surface/interface wave modes can be observed at the interface between dissimilar photonic crystals or metamaterials. The interface elastic wave mode is the elastic analog of its optical and acoustic counterparts. However, compared with the optical and acoustic systems, the investigations of the surface/interface elastic waves in phononic crystals and elastic metamaterials are quite limited and rarely reported in literature. In this talk, the surface/interface elastic waves propagating along the interfaces between a semi-infinite homogeneous background medium and a semi-infinite phononic crystal or elastic metamaterial will be presented. Numerical examples demonstrate that the surface/interface elastic waves decay rapidly into the phononic crystal (elastic metamaterial) or the homogeneous medium, and can be tuned by changing the geometrical configuration of the interfaces. A cavity which can confine the interface elastic waves is proposed. It is shown that the interface wave mode cavity can couple with other bulk wave modes, which may provide a new way for designing integrated phononic circuits. Moreover, the interface elastic waves can be utilized in many challenging applications, such as energy harvesting, sensing and collimation.

報告人簡介：

張傳增教授主要從事的科研領域包括智能材料與結構力學、功能梯度材料與結構力學、壓電和磁電彈材料力學分析、彈性動力學、斷裂動力學、計算力學、計算機仿真。張傳增教授2015年獲得Du Qinghua Medal & Awards of Computational Methods in Engineering。張傳增教授現(xiàn)為德國最高級別C4教授，德國錫根大學土木工程系系主任，英國威塞克斯技術學院客座研究員，同濟大學兼職教授，哈爾濱工業(yè)大學客座教授，哈爾濱工程大學客座教授，澳門大學資深客座教授(2010-2011)，南京航空航天大學客座教授，中國建筑材料科學研究總院客座教授。2014年11月當選為歐洲科學院院士(European Academy of Sciences)，2015年1月被授予斯洛伐克工業(yè)大學榮譽博士(Doctor Honoris Causa或簡稱Dr. h. c.)，2015年9月當選為歐洲科學與藝術院院士(European Academy of Sciences)，2016年6月當選為歐洲人文與自然科學院院士(Academia Europaea)。國際著名力學專家。