Stress guides in generic static mechanical metamaterials  

作　　者：Aoxi Wang Chang Qing Chen 

机构地区：[1]Department of Engineering Mechanics,Center for Nano and Micromechanics and Key Laboratory of Applied Mechanics,Tsinghua University,Beijing 100084,China

出　　处：《National Science Review》2024年第9期273-284,共12页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(12132007 and 11921002).

摘　　要：The confinement of waves within a waveguide can enable directional transmission of signals,which has found wide applications in communication,imaging,and signal isolation.Extending this concept to static systems,where material deformation is piled up along a spatial trajectory,remains elusive due to the sensitivity of localized deformation to structural defects and impurities.Here,we propose a general framework to characterize localized static deformation responses in two-dimensional generic static mechanical metamaterials,by exploiting the duality between space in static systems and time in one-dimensional non-reciprocal wave systems.An internal time-reverse symmetry is developed by the space-time duality.Upon breaking this symmetry,quasi-static load-induced deformation can be guided to travel along a designated path,thereby realizing a stress guide.A combination of time-reverse and inversion symmetries discloses the parity-time symmetry inherent in static systems,which can be leveraged to achieve directional deformation shielding.The tailorable stress guides can find applications in various scenarios,ranging from stress shielding and energy harvesting in structural tasks to information processing in mechanical computing devices.

关 键 词：stress guides space-time duality mechanical metamaterials NON-HERMITIAN 

分 类 号：TB34[一般工业技术—材料科学与工程]