共查询到20条相似文献，搜索用时 0 毫秒
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Ratul Das Kui Pan Sheldon Green A. Srikantha Phani 《Advanced Engineering Materials》2021,23(2):2000777
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Sophie Leanza Shuai Wu Xiaohao Sun H. Jerry Qi Ruike Renee Zhao 《Advanced materials (Deerfield Beach, Fla.)》2024,36(9):2302066
In recent decades, origami has been explored to aid in the design of engineering structures. These structures span multiple scales and have been demonstrated to be used toward various areas such as aerospace, metamaterial, biomedical, robotics, and architectural applications. Conventionally, origami or deployable structures have been actuated by hands, motors, or pneumatic actuators, which can result in heavy or bulky structures. On the other hand, active materials, which reconfigure in response to external stimulus, eliminate the need for external mechanical loads and bulky actuation systems. Thus, in recent years, active materials incorporated with deployable structures have shown promise for remote actuation of light weight, programmable origami. In this review, active materials such as shape memory polymers (SMPs) and alloys (SMAs), hydrogels, liquid crystal elastomers (LCEs), magnetic soft materials (MSMs), and covalent adaptable network (CAN) polymers, their actuation mechanisms, as well as how they have been utilized for active origami and where these structures are applicable is discussed. Additionally, the state-of-the-art fabrication methods to construct active origami are highlighted. The existing structural modeling strategies for origami, the constitutive models used to describe active materials, and the largest challenges and future directions for active origami research are summarized. 相似文献
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本文概述了第六届国际材料的力学行为会议(ICM6),着重介绍了各国在新材料的力学行为研究中取得的最新成果,并讨论了它在新材料发展和应用中的重要作用。文章最后就如何加强我国在该领域的研究提出了几点建议。 相似文献
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T. Hirschler;R. Bouclier;P. Antolin;A. Buffa; 《International journal for numerical methods in engineering》2024,125(8):e7419
This paper addresses the overwhelming computational resources needed with standard numerical approaches to simulate architected materials. Those multiscale heterogeneous lattice structures gain intensive interest in conjunction with the improvement of additive manufacturing as they offer, among many others, excellent stiffness-to-weight ratios. We develop here a dedicated HPC solver that benefits from the specific nature of the underlying problem in order to drastically reduce the computational costs (memory and time) for the full fine-scale analysis of lattice structures. Our purpose is to take advantage of the natural domain decomposition into cells and, even more importantly, of the geometrical and mechanical similarities among cells. Our solver consists in a so-called inexact FETI-DP method where the local, cell-wise operators and solutions are approximated with reduced order modeling techniques. Instead of considering independently every cell, we end up with only few principal local problems to solve and make use of the corresponding principal cell-wise operators to approximate all the others. It results in a scalable algorithm that saves numerous local factorizations. Our solver is applied for the isogeometric analysis of lattices built by spline composition, which offers the opportunity to compute the reduced basis with macro-scale data, thereby making our method also multiscale and matrix-free. The solver is tested against various 2D and 3D analyses. It shows major gains compared to black-box solvers; in particular, problems of several millions of degrees of freedom can be solved with a simple computer within few minutes. 相似文献
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Zuojia Wang Liqiao Jing Kan Yao Yihao Yang Bin Zheng Costas M. Soukoulis Hongsheng Chen Yongmin Liu 《Advanced materials (Deerfield Beach, Fla.)》2017,29(27)
Origami is the art of folding two‐dimensional (2D) materials, such as a flat sheet of paper, into complex and elaborate three‐dimensional (3D) objects. This study reports origami‐based metamaterials whose electromagnetic responses are dynamically controllable via switching the folding state of Miura‐ori split‐ring resonators. The deformation of the Miura‐ori unit along the third dimension induces net electric and magnetic dipoles of split‐ring resonators parallel or anti‐parallel to each other, leading to the strong chiral responses. Circular dichroism as high as 0.6 is experimentally observed while the chirality switching is realized by controlling the deformation direction and kinematics. In addition, the relative density of the origami metamaterials can be dramatically reduced to only 2% of that of the unfolded structure. These results open a new avenue toward lightweight, reconfigurable, and deployable metadevices with simultaneously customized electromagnetic and mechanical properties. 相似文献
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Oraib Al‐Ketan Rachid Rezgui Reza Rowshan Huifeng Du Nicholas X. Fang Rashid K. Abu Al‐Rub 《Advanced Engineering Materials》2018,20(9)
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Jochen Mueller Jordan R. Raney Kristina Shea Jennifer A. Lewis 《Advanced materials (Deerfield Beach, Fla.)》2018,30(12)
The ability to create architected materials that possess both high stiffness and toughness remains an elusive goal, since these properties are often mutually exclusive. Natural materials, such as bone, overcome such limitations by combining different toughening mechanisms across multiple length scales. Here, a new method for creating architected lattices composed of core–shell struts that are both stiff and tough is reported. Specifically, these lattices contain orthotropic struts with flexible epoxy core–brittle epoxy shell motifs in the absence and presence of an elastomeric silicone interfacial layer, which are fabricated by a multicore–shell, 3D printing technique. It is found that architected lattices produced with a flexible core‐elastomeric interface‐brittle shell motif exhibit both high stiffness and toughness. 相似文献