Research on In‐plane Quasi‐Static Mechanical Properties of Gradient Tetra‐Chiral Hyper‐Structures. Issue 3 (2nd January 2019)

• Record Type: Journal Article
• Authors: Li, Mingxuan; Lu, Xiaofeng; Zhu, Xiaolei; Su, Xiaoping; Wu, Taoyu
• Is Part Of: Advanced engineering materials. Volume 21:Issue 3(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-01-02
• Subjects: elastic‐plastic behavior -- gradient -- lateral compression -- tetra‐chiral -- theoretical model; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201801038
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Chiral hyper‐structure is a family of lightweight structure with negative Poisson's ratio, which leads benefit in mechanical properties and designability. In order to further improve some mechanical properties of chiral hyper‐structures, the concept of gradient is introduced into the structure. Five groups of gradient tetra‐chiral hyper‐structure with different gradient factors are fabricated based on waterjet cutting technology, and the in‐plane quasi‐static lateral compression tests are carried out. Finite element models are developed for the in‐plane linear elastic mechanical properties and plastic deformation modes under lateral compression condition. Theoretical prediction models of elastic modulus in gradient direction and Poisson's ratio of the gradient tetra‐chiral hyper‐structure is derived based on geometric assumptions and inhomogeneous deformation mode which are verified by experiments and finite element analysis. Simultaneously, the effects of gradient factors on the deformation characteristics and mechanical behaviors of the tetra‐chiral hyper‐structure are discussed and analyzed. Abstract : A kind of gradient tetra‐chiral hyper structure has been proposed, and its elastic‐plastic mechanical properties have been studied by FEA, experimental and theoretical methods. The results show that the structure has good functionality and application prospects which proves that the gradient of the chiral structure is a meaningful exploration.