Cellular solids with tunable positive or negative thermal expansion of unbounded magnitude
Cellular solids with tunable positive or negative thermal expansion of unbounded magnitude
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DOI：
10.1063/1.2743951
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发表时间：
2007-05-28
影响因子：
4
通讯作者：
Lakes, Roderic
中科院分区：
文献类型：
--
作者：
Lakes, Roderic
材料微观结构的热膨胀系数比任何一种成分的热膨胀系数都大。热膨胀可以是大的正、零或大的负。具有空隙空间的三维晶格超越两相边界但服从三相边界；晶格和普通材料的膨胀随模量的增大而减小。具有负刚度相的两相复合材料超过了假设为正应变能密度的界限。测定了杨氏模量及其与热膨胀的关系。在膨胀模量图中，将这些复合材料的性能与均匀固体的性能进行了比较。(C) 2007年美国物理研究所。
Material microstructures are presented with a coefficient of thermal expansion larger in magnitude than that of either constituent. Thermal expansion can be large positive, zero, or large negative. Three-dimensional lattices with void space exceed two-phase bounds but obey three-phase bounds; lattices and normal materials have a trend of expansion decreasing with modulus. Two-phase composites with a negative stiffness phase exceed bounds that assume positive strain energy density. The author determined Young's modulus and its relation to thermal expansion. Behavior of these composites is compared with that of homogeneous solids in expansion-modulus maps. (C) 2007 American Institute of Physics.