NONLINEAR-ANALYSIS OF THE POISSON RATIO OF NEGATIVE POISSON RATIO FOAMS
NONLINEAR-ANALYSIS OF THE POISSON RATIO OF NEGATIVE POISSON RATIO FOAMS
复制标题
DOI：
10.1177/002199839502900106
复制
发表时间：
1995-01-01
影响因子：
2.9
通讯作者：
LAKES, RS
中科院分区：
文献类型：
--
作者：
CHOI, JB;LAKES, RS
本文对具有负泊松比的可再入泡沫材料的泊松比进行了分析研究。这些材料拉伸时会变得更胖，压缩时会变薄。泊松效应对材料的性能是如此重要，以至于比值的大小变化将对材料的机械性能产生重大影响。通过永久体积变换制备了具有负泊松比的各向同性泡沫结构。泡孔由传统泡沫孔的凸多面体形状转变为凹面或“再入”形状。可再入开孔泡沫材料的力学行为将不同于传统泡沫材料，但现有的理论处理方法没有解决这些问题。通过将三维单胞模拟为理想的多面体单胞，得到了泊松比与应变的函数关系。随着理想胞体体积压缩比的增大，泊松比预计将接近各向同性极限-1，而实验值仅为-0.8。
This article contains an analytic study of Poisson's ratio of re-entrant foam materials with negative Poisson's ratio. These materials get fatter when stretched and thinner when compressed. The Poisson effect is so fundamentally important to the properties of a material that a large change in the value of the ratio will have significant effects on the material's mechanical performance. Isotropic foam structures with negative Poisson's ratio have been fabricated through a permanent volumetric transformation. The cells were converted from the convex polyhedral shape of conventional foam cells to a concave or ''re-entrant'' shape. Mechanical behavior of a re-entrant open cell foam material will differ from that of a conventional foam in ways not addressed by existing theoretical treatment. Poisson's ratio as a function of strain is obtained by modeling the three-dimensional unit cell as an idealized polyhedron unit cell. Poisson's ratio is predicted to approach the isotropic limit of -1 with increasing permanent volumetric compression ratio of idealized cells, in comparison with experimental values as small as -0.8.