拉脹性方塊於可調功能熱超穎材料之實現

Abstract

本研究之內容為可調式熱超穎材料概念之提出，結合拉脹性旋轉方塊之變形機制使原本僅具單一功能之熱超穎材料可達到功能性上的轉換，進而實現具可調功能的熱超穎材料。探討方式以熱超穎材料中最普遍之課題，熱遮蔽裝置，作為可調控功能之研究，經由外力的施加使其能由熱遮蔽裝置轉換為熱集中裝置。其中以商用有限元素軟體進行分析模擬，探討本研究所提出之可調式熱遮蔽-集中裝置其可調性與功能性，亦透過熱傳實驗觀察試體之溫度分佈，並與模擬進行相互印證。本研究提出之可調式熱遮蔽-集中裝置，可調控其內部區域之溫度梯度變化，此外並提出一得到原熱超穎材料轉換後其功能性之方法，作為後續相關研究之使用。

By combining the rotating squares with auxetic property, this study proposed a concept of thermal metamaterials with tunable functionalities. Here we introduce such thermal metamaterial, which can change from a cloak to a concentrator when the metamaterial are subjected to external forces. The proposed dual functional metamaterial can thermally protect a region and transform into a concentrator to focus heat flux in a small region, in both simulation and experimental verification using finite element method and fabricated structures made form copper, epoxy and rotating squares. This work paves the way for a controllable gradient of heat, and also provides guidance for other thermal metamateriasls with tunable functionalities.