期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008252
关键词
active material; architectured material; pseudoelasticity; self‐ stressed cellular structures
类别
资金
- National Natural Science Foundation of China [51822503]
- State Key Laboratory of Robotics and System [SKLRS201813B]
- University of Manchester School of Mechanical Aerospace and Civil Engineering
- University of Manchester Aerospace Research Institute
- Cookson Memorial Fund
- Postdoctoral International Exchange Program of China
The introduction of a macroscopic cellular structure comprising two pre-stressed elastic phases with load-sensitive stiffness that drops upon pseudoductile transformation and fully recoverable compression capability. By utilizing thermal-shrinkage for pre-stressing and heat-activated self-formation, along with a method for generating single-crystal or poly-crystal-like 3D lattices with anisotropic or isotropic super-elasticity, this metamaterial exhibits lightweight characteristics and high deformability.
Scarcity of stiff, yet compliant, materials is a major obstacle toward biological-like mechanical systems that perform precise manipulations while being resilient under excessive load. A macroscopic cellular structure comprising two pre-stressed elastic phases is introduced, which displays a load-sensitive stiffness that drops by 30 times upon a pseudoductile transformation and accommodates a fully recoverable compression of over 60%. This provides an exceptional 20 times more deformability beyond the linear-elastic regime, doubling the capability of previously reported super-elastic materials. In virtue of the pre-stressing process based on thermal-shrinkage, it simultaneously enables a heat-activated self-formation that transforms a flat laminate into the metamaterial with 50 times volumetric growth. The metamaterial is thereby inherently lightweight with a bulk density in the order of 0.01 g cm(-3), which is one order of magnitude lower than existing super-elastic materials. Besides the highly programmable geometrical and mechanical characteristics, this paper is the first to present a method that generates single-crystal or poly-crystal-like 3D lattices with anisotropic or isotropic super-elasticity. This pre-stress-induced adaptive stiffness with high deformability could be a step toward in situ deployed ultra-lightweight mechanical systems with a diverse range of applications that benefit from being stiff and compliant.
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