Negative thermal expansion structures constructed from positive thermal expansion trusses |
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Authors: | Teik-Cheng Lim |
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Affiliation: | (1) School of Science and Technology, SIM University, Singapore, Singapore |
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Abstract: | The negative thermal expansivity of a type of space frame structure is investigated herein. On the basis of space frame structure
consisting of tetrahedral representative volume elements, a volumetric thermal strain, and a volumetric coefficient of thermal
expansion (CTE) models are developed in this article for a special category of tetrahedron that is made from two types of
materials, each for the three apex and the three base rods. Based on these models, the conditions for attaining negative volumetric
thermal strain and negative coefficient of volumetric thermal expansion are established. Plotted results reveal a trend in
which the extent of negative expansivity is increased for lower apex-to-base rod length and CTE ratios, and higher base rod
CTE. |
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Keywords: | |
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