A preliminary study of negative Poisson's ratio of laminated fiber reinforced composites

Composite materials can be regarded as structures, so there is a great oppo rtunity to design a wide range of properties for such kind of material to m eet the various application requirements, even a very particular one. A neg ative Poisson's ratio is an example. The mechanism of negative Poisson's ratio and the basic conditions for obta ining such a property were analyzed briefly, the formulas of optimal angle for designing minus Poisson's ratio were deduced, and the experimental resu lts were given. The designed composite did show negative, but small Poisson 's ratio.