摘要
聚焦于兼具负泊松比效应与高拉伸性能的剪纸超材料,采用试验与数值模拟相结合的方法开展研究。通过HyperMesh建立参数化模型,利用Ls-Dyna进行有限元仿真,结合选择性激光烧结技术(SLS)制备尼龙PA2200试件,开展准静态拉伸试验,系统探究其力学行为及调控机制。研究表明单胞几何参数(级数、空隙宽度)对其力学性能具有显著调控作用,三级结构(N3)相比于一级结构(N1)拉伸性能提升了413%,最大负泊松比达-0.25;空隙宽度减小可使负泊松比效应提升38%。材料呈现独特“勺型”泊松比演化规律,高级数结构(N2、N3)的负泊松比效应可维持超100%应变范围。将设计拓展至三维管状结构,发现其具有渐进强化-平缓失效等变形模式。本研究为可编程负泊松比高拉伸超材料的开发提供了理论与试验依据,在柔性电子、航空航天等领域具有重要应用潜力。
This paper focuses on the origami metamaterials with both negative Poisson's ratio effect and high tensile performance.The research is conducted by combining experiments and numerical simulations.Parametric models are established using HyperMesh,and finite element simulations are carried out with Ls-Dyna.Nylon PA2200 specimens are fabricated by Selective Laser Sintering(SLS),and quasi-static tensile tests are performed to systematically investi-gate their mechanical behavior and regulation mechanism.The research shows that the unit cell geometric parameters(level,gap width)have a significant regulatory effect on the material properties:the tensile performance of the three-level structure(N3)is 413%higher than that of the one-level structure(N1),and the maximum negative Poisson's ratio reaches-0.25;reducing the gap width can increase the negative Poisson's ratio effect by 38%.The material exhibits a unique"spoon-shaped"Poisson's ratio evolution law,and the negative Poisson's ratio effect of the high-level structures(N2,N3)can be maintained over a strain range of more than 100%.When the design is extended to three-dimensional tubular structures,it is found that they have novel deformation modes such as progressive strength-ening and smooth failure.This study provides theoretical and experimental basis for the development of programmable negative Poisson's ratio high-tensile metamaterials,which have important application potential in fields such as flex-ible electronics and aerospace.
作者
王祎
刘华
杨嘉陵
杨先锋
WANG Yi;LIU Hua;YANG Jialing;YANG Xianfeng(National Key Laboratory of Strength and Structural Integrity,School of Aeronautic Science and Engineering,Beihang University,Beijing 100191,China)
出处
《航空学报》
北大核心
2025年第21期205-218,共14页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(12472376)。
关键词
剪纸超材料
负泊松比
高可拉伸性
3D打印
有限元仿真
paper-cutting metamaterials
negative Poisson's ratio
high stretchability
3D printing
finite element simulation
