Multilayer Composite Materials with Non-Usual Poisson's Ratios
Most of usual materials exhibit Poisson's ratio comprised between 0 and 0.5. But, for some kind of cellular materials, or for some stacking sequences of unidirectional plies, a composite material can exhibit negative or greater than 0.5 Poisson's ratios. In this paper, a study of different stacking sequences such as [±β/±θ]s plies made from highly anisotropic fibre pre-preg is presented. A special computer programme has been developed for this purpose. Eighteen stacking sequences, including the [±θ] ones, have been computed. The results show that at least one of Poisson's ratios varies between -0.8 to +0.4. Such kind of materials may find applications for particular cases, as their strength is significantly increased by this phenomenon.
Dragan P. Uskoković, Slobodan K. Milonjić and Dejan I. Raković
E.H. Harkati et al., "Multilayer Composite Materials with Non-Usual Poisson's Ratios", Materials Science Forum, Vol. 555, pp. 545-552, 2007