期刊
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
卷 193, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2020.106169
关键词
Auxetic; Negative Poisson's ratio; Isogeometric analysis; Genetic algorithm; Shape optimization; 3D Printing; Optical deformation measurement
资金
- MOE Tier 2 [R302000139112]
This paper proposes an isogeometric shape optimization framework using genetic algorithm to design 2D auxetic structures with prescribed Poisson's ratio in the nonlinear deformation regime. The versatility of the framework is demonstrated through optimization of a missing rib structure under different loading conditions, showing manufacturability using NURBS and PolyJet 3D printing. Experimental results match well with numerical predictions, highlighting the need for further investigations on compression behavior in very flexible materials.
This paper presents an isogeometric shape optimization framework using genetic algorithm to design 2D auxetic structures with prescribed Poisson's ratio over large tensile or compressive strains in the nonlinear deformation regime. The design domain is parametrized using NURBS to allow smoother shape variation of the structure and enable accurate fabrication of the optimized structures. The versatility of the framework is illustrated through the optimization of a missing rib structure with four ligaments under different loading conditions. The manufacturability of specimens using the NURBS and PolyJet 3D printing technology is also shown. The first example focuses on achieving constant negative Poisson's ratio up to -0.7 within the applied tensile strain of 50% under plane stress condition. As auxetics experiments under large compressive strain are rarely performed and published, the second example demonstrates the optimization for compressive loading. The Poisson's ratio determined from experiments matches well with the numerical results. The experiments highlight that for very flexible materials, deformation under self-weight and contacts between adjacent unit cells are significant factors in compression, and further investigations are needed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据