Symmetry breaking in spoke double-ring structures formed by buckling-guided 3D assembly  

作　　者：Xiaoran Yang Jianzhong Zhao Alexander Hartmaier Yonggang Huang Yihui Zhang 

机构地区：[1]Applied Mechanics Laboratory,Department of Engineering Mechanics,Tsinghua University,Beijing 100084,China [2]Laboratory of Flexible Electronics Technology,Tsinghua University,Beijing 100084,China [3]Interdisciplinary Center for Advanced Materials Simulation(ICAMS),Ruhr-Universität Bochum,Bochum 44801,Germany [4]Department of Civil and Environmental Engineering,Northwestern University,Evanston,IL 60208,USA [5]Department of Mechanical Engineering,Northwestern University,Evanston,IL 60208,USA [6]Department of Materials Science and Engineering,Northwestern University,Evanston,IL 60208,USA

出　　处：《Theoretical & Applied Mechanics Letters》2025年第1期25-31,共7页力学快报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12225206,11921002,and 12202233);the New Cornerstone Science Foundation through the XPLORER PRIZE;the Tsinghua National Laboratory for Information Science and Technology,and a grant from the Institute for Guo Qiang,Tsinghua University(Grant No.2021GQG1009).

摘　　要：The buckling-guided three-dimensional(3D)assembly method has arisen increasing attention for its advantages in forming complex 3D architectures with a rich diversity of geometric shapes in a broad spectrum of inorganic functional materials.Such an assembly method relies on the controlled lateral bucking of a 2D precursor structure integrated with a pre-stretched substrate at selective regions.In the assembly process,the preservation or break-ing of rotational symmetry is crucial for understanding the mechanism of 2D-to-3D geometric transformation.Here,we present a fundamental study on the rotational symmetry of 3D spoke double-ring structures formed through buckling-guided assembly.An energetic method is introduced to analyze the rotational symmetry and to understand the symmetry-breaking mechanism.Such symmetry-breaking phenomenon is validated by experi-ments and finite element analyses(FEA).Phase diagrams of the deformation mode are established to shed light on the influences of various geometric parameters(e.g.,initial rotational symmetry order,radius ratio,and lo-cation of bonding sites).This work offers new insights into the underlying mechanism of 2D-to-3D geometric transformation in ribbon-type structures formed by compressive buckling.

关 键 词：Buckling-guided 3D assembly Rotational symmetry POST-BUCKLING Instability 

分 类 号：O343.9[理学—固体力学]