Auxetic Thin-Walled Square Tubes Subjected to Oblique Loading

Abstract

The use of auxetic structures with a negative Poisson’s ratio in thin-walled tubes, which are widely used in many fields, is one of the topics discussed recently. This is because re-entrant auxetic tubes are generally more resistant to loads such as compression and impact than conventional honeycomb structures due to their high indentation resistance. However, there is limited information in the literature regarding the use of these structures on different sides of the thin-walled tube. In addition, there are few studies on how the compressive behavior of the re-entrant auxetic structure changes when subjected to an oblique load. In this study, the effect of oblique loading on thin-walled square tubes with re-entrant and traditional honeycomb structures on the sides was investigated numerically. The side faces of the tubes were designed using auxetic re-entrant and conventional honeycomb cells with constant ligament properties. Four different types of square tubes were created with the designed re-entrant auxetic and conventional honeycomb side faces. These structures are; all side faces re-entrant (RRRR), all side faces honeycomb (HHHH), opposite side faces re-entrant-honeycomb (RHRH), and adjacent side faces re-entrant-honeycomb (RRHH). Oblique loads were applied to the edges and corners of these structures and their behavior was examined. The results showed that the use of different lattice structures on the thin-walled tubes significantly affected their behavior.