Negative compressibility property in hinging open-cell Kelvin structure* *Project supported by the National Natural Science Foundation of China (Grant Nos. U1601203 and U19A20104), the Jilin Provincial Science and Technology Development Program, China (Grant Nos. 20180101321JC and 20190302099GX), the Jilin Provincial Industrial Technology of Research and Development, China (Grant No. 2019C037-3), the Science and Technology Project of Jilin Provincial Department of

Abstract

A new three-dimensional (3D) cellular model based on hinging open-cell Kelvin structure is proposed for its negative compressibility property. It is shown that this model has adjustable compressibility and does exhibit negative compressibility for some certain conformations. And further study shows that the images of compressibility are symmetrical about the certain lines, which indicates that the mechanical properties of the model in the three axial directions are interchangeable and the model itself has a certain geometric symmetry. A comparison of the Kelvin model with its anisotropic form with the dodecahedron model shows that the Kelvin model has stronger negative compressibility property in all three directions. Therefore, a new and potential method to improve negative compressibility property can be derived by selecting the system type with lower symmetry and increasing the number of geometric parameters.