Investigation the Effect of Support on Energy Absorption Performance for Reinforcing Auxetic Star Metastructures Under Quasi-Static Loading: A Numerical Study

Common materials with a positive Poisson's ratio, there are structures with a negative Poisson's ratio that expand laterally when stretched longitudinally. These materials are known as auxetic materials, which possess unique and significant properties. One of the most important characteristics of these materials is their energy absorption capability. This feature has led to their application in various industries. In this study, the aim is to enhance the energy absorption capability of honeycomb structures with star-shaped cells and additional supports. Four types of modified cells were introduced, and their performance was compared with one another. To achieve this goal, five samples were simulated under quasi-static pressure testing using finite element software. For all structures, the specific energy absorption and average crushing force were calculated and compared. The material chosen for these structures was polylactic acid. To conduct the simulation, a tensile test was first performed to obtain the mechanical properties of the material used in the structures. To evaluate the energy absorption, a quasi-static test was simulated for structures using (Abaqus/Static General). The results showed that the optimal structure was identified as the one with the code VDSS. This structure has an energy absorption capacity of ۲۰۷.۴۶ joules, a specific energy absorption of ۴.۴۴ kilojoules per kilogram, and an average crushing force of ۸۲۹۸.۲۵ newtons.

کلیدواژه ها:

Meta structures ، auxetic cells ، energy absorbing ، star cells