On compacting pattern control of finite-size 2D soft periodic structures through combined loading. (1st September 2022)

• Record Type: Journal Article
• Authors: Li, D.M.; Kong, Ling-Hao; Qian, Yi-Cheng
• Is Part Of: Engineering structures. Volume 266(2022)
• Publication Date: 2022-09-01
• Subjects: 2D soft periodic structures -- Buckling -- Post-buckling -- Hyper-elasticity -- Finite element analysis; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2022.114574
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: The possibility of using combined loading to control the compacting pattern of 2D soft periodic structures was discussed. The loading schemes for biaxial loading and combined normal and shear loading were designed. The buckling and post-buckling behaviors of 2D soft periodic structures under combined loading were investigated. The RCPs and the CPCLs on the loading plane of each structure and their relationship were analyzed. Abstract: 2D soft periodic structures can produce reversible compaction and relaxation behaviors with complex and diverse compacting patterns during loading and unloading. The (trans)formation and control of the recoverable and adjustable compacting pattern are essential in their wide range of application prospects. In addition to the traditional schemes, this paper proposes and discusses the possibility of using combined loading to control the compacting pattern of finite-size 2D soft periodic structures. Based on the detailed analysis and design of the loading schemes, the buckling and post-buckling behaviors of four kinds of 2D soft periodic structures with finite size under biaxial loading and combined normal and shear loading are investigated by a validated ABAQUS finite element analysis. The buckling model shapes of each structure under each loading combination are discussed and classified in detail to determine the Representative Compacting Patterns (RCPs) and the Critical Points of model transformation Controlled by Loading (CPCL) on the loading plane. Of course, some new modes have been found. Moreover, the CPCL between RCPs without conversion relationship is found to have a corresponding relationship with the variation of the difference between the first eigenvalue and the second eigenvalue of the structure on the loading plane. By using the rotation angle of the hole walls as an index, the compacting behavior and characteristics of each pattern in the process of post-buckling are analyzed quantitatively. The research ideas and results of this paper will provide a new design space for various application fields of finite-size 2D soft periodic structures.