Unit Cell Modelling of Auxetic Structure

Auxetic material structures exhibit a negative Poisson ratio. The structure expands in the axial and transverse directions under tensile loading vice versa compression loading. Many fabricated designs for auxetic materials exist such as re-entrant hexagonal, chiral, arrowhead geometries. This paper studies unit cell of hexagonal geometry to understand how changing internal angle fillet radius affects Poisson’s chosen this study is acrylonitrile butadiene styrene (ABS) due its availability frequent use additive manufacturing. was based on finite element analysis. It observed that direction load applied strain, ratio, maximum capacity before failure responses. noticed starts by showing standard non-auxetic behavior until it reaches specific strain value. A quadratic correlation identified between strain. Designing an with understanding structure. design complex process requires compromise property be achieved via avoiding stress concentration zones.