Auxetic behavior of 3D-printed structure made in acrylonitrile butadiene styrene and carbon fiber-reinforced polyamide

Abstract Parts with an auxetic structure, which exhibit negative Poisson’s ratio, can be associated a novel class of smart materials. Such interesting property has been widely explored, over the time, for different applications, i.e., medical, automotive, robotic and aeronautic field. However, research about design analysis behavior is still on way. In this paper, 2D re-entrant honeycomb structure was realized using material extrusion additive manufacturing technology. Two materials, acrylonitrile butadiene styrene carbon fiber-reinforced polyamide were adopted. The technique digital image correlation implemented during tensile test to evaluate time in areas specimens strain both investigated measured ratio confirmed designed structure. comparison between two materials showed trend ratio.