Independently Tunable Thermal Conductance and Phononic Band Gaps of 3D Lattice Materials
Independently Tunable Thermal Conductance and Phononic Band Gaps of 3D Lattice Materials
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DOI：
10.1002/adem.201901004
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发表时间：
2019-12
影响因子：
3.6
通讯作者：
Oluseyi Babatola;Ganesh U. Patil;Daniel Hsieh;K. Matlack;S. Sinha
中科院分区：
文献类型：
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作者：
Oluseyi Babatola;Ganesh U. Patil;Daniel Hsieh;K. Matlack;S. Sinha
晶格材料具有不同寻常的热学和振动特性，但结构不同。然而，热和振动的多功能性对于汽车、航空航天、建筑、交通和能源基础设施等热机械应用至关重要。在涉及移动性的应用中，需要高传热和低质量。虽然已经有各种各样的努力来设计多功能晶格材料，但重点主要集中在准静态力学和热性能或力学和振动性能上。本文报道了一种可实现的晶格材料的设计，该材料具有固有的热阻性，具有大大改善的热导率和全向声子带隙。通过将桁架结构重新设计为相互连接的热管，发现比导热系数提高了三个数量级。进一步利用桁架节点的节点质量来获得完整的振动带隙。结果表明，在同一结构中，可以独立地调整振动和热性能。这项工作为设计和制造同时防止结构振动和增强热传导的多功能晶格材料提供了背景。
Lattice materials provide unusual thermal and vibrational properties but not within the same structure. Thermal and vibrational multifunctionality is, however, crucial for thermomechanical applications such as automotive, aerospace, building, transportation, and energy infrastructure. In applications involving mobility, both high heat transfer and low mass are desired. Although there have been various efforts to design multifunctional lattice materials, the focus has largely remained on quasi‐static mechanical and thermal properties or mechanical and vibrational properties. Herein, designs of realizable lattice materials are reported, which are inherently thermally resistive, with vastly improved thermal conductance and omnidirectional phononic band gaps. By redesigning the truss structures to serve as interconnected heat pipes, a three‐order‐of‐magnitude improvement in the specific thermal conductance is found. Nodal masses at truss junctions are further used to obtain full vibrational band gaps. It is shown that it is possible to independently tune vibrational and thermal properties within the same structure. This work provides background for the design and fabrication of multifunctional lattice materials that simultaneously prevent structural vibrations and enhance heat conduction.