On the inclined static loading of honeycomb re-entrant auxetics

• DOI: 10.1016/j.compstruct.2021.114289
• Publication Date: 2021-06-27T22:09:21Z
• Authors: Rahul Singh Dhari; Zia Javanbakht; Wayne Hall
• Keywords: Engineering; 330; 0205 materials engineering; 0203 mechanical engineering; Other engineering; Civil engineering; 02 engineering and technology

Abstract The present study unravels the deformation mechanisms observed during the static inclined compression of re-entrant honeycomb (RH) auxetic structure. A pushover Riks analysis is conducted by facing a rigid plate towards the structure at various angles. A new ‘plastic hinge tracing method’ is introduced to systematically extract the micro deformation mechanisms under inclined loading. The identified modes are related to the macro deformation regime and the overall mechanical response of the RH structure. Moreover, their relation to various measures of efficiency is elaborated. It is shown that a transition stage emerges under inclined loading, which delays achieving the peak energy efficiency. The overall energy dissipation decreases in the inclined cases but interestingly, the performance of the RH structure does not deteriorate. Namely by maintaining a low crushing force under inclined loads, the trade-off of low energy dissipation is balanced and a lower impact is anticipated. Finally, the similarities between the transition stage and the macro modes are highlighted and further directions for investigation are proposed.