A discussion of negative Poisson's ratio design for composites

It is feasible to design laminated composites with negative Poisson's ratio . Although the minimum value of negative Poisson's ratio design can be done via numerical approach, it is possible to use the analytical method in thi s paper to perform the following tasks: (a) evaluate the approximated ply o rientation angles to obtain maximum transverse strain epsilon(gamma), (b) d etermine the necessary conditions of design negative Poisson's ratio,and (c ) investigate the influence of laminae properties on the Poisson's ratio of a composite laminate. In this study, it is also found that, in general, the ply orientations for obtaining maximum transverse strain, epsilon(gamma), in a composite laminat e are close to [70 degrees/20 degrees](S).