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