Investigation of a Novel Chiral S-Shaped Auxetic Structure under Large Tensile Deformation

The behavior of the chiral S-shaped structure subjected to large tensile loads in bothXandYdirections is reported herein. The physical samples of stainless steel 316L are fabricated by the selective laser melting technique and experimental tests are conducted on a universal tensile testing machine. The results of tensile tests in the form of deformation patterns, tensile stress-strain curves, and Poisson's ratios are shown pictorially and graphically. The orientation of the S-shaped structure withX-direction loading is found to exhibit higher auxeticity over the large range of tensile loading. Nonetheless, the structure is also found auxetic when loaded fromY-direction albeit the values of negative Poisson's ratios are not as high as of theX-directional loading.