Song Fan, Zhou Junbing, Xu Xianghong, Xu Yi, Bai Yilong
State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
Phys Rev Lett. 2008 Jun 20;100(24):245502. doi: 10.1103/PhysRevLett.100.245502. Epub 2008 Jun 18.
The effect of a negative Poisson ratio is experimentally revealed in the tension deformation of a natural layered ceramic. This effect can increase the volume strain energy per unit volume by 1100% and, simultaneously, decrease the deformation strain energy per unit volume by about 44%, so that it effectively enhances the deformation capacity by about 1 order of magnitude in the tension of the material. The present study also shows that the physical mechanisms producing the effect are attributed to the climbing on one another of the nanostructures in the natural material, which provides a guide to the design of synthetic toughening composites.
在天然层状陶瓷的拉伸变形中，通过实验揭示了负泊松比效应。这种效应可使单位体积的体积应变能增加1100%，同时使单位体积的变形应变能降低约44%，从而在材料拉伸过程中有效地将其变形能力提高约1个数量级。本研究还表明，产生该效应的物理机制归因于天然材料中纳米结构的相互攀爬，这为合成增韧复合材料的设计提供了指导。
