نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسندگان English
Introduction and Objectives: Auxetic structures have attracted significant attention in recent years due to their negative Poisson’s ratio and features such as high impact resistance and enhanced energy absorption. Re-entrant structures are among the most widely used auxetic geometries. This study aims to investigate the mechanical behavior and energy absorption capacity of these structures and to propose geometric modifications to improve their performance.
Materials and Methods: To determine the mechanical properties of the material, including Young’s modulus and yield stress, standard tensile specimens were fabricated using an FDM 3D printer with PLA+ filament and tested experimentally. A two-dimensional model of the re-entrant structure was then simulated under in-plane quasi-static compression using ABAQUS. To enhance the energy absorption behavior, two geometric modifications were applied, namely replacing sharp re-entrant corners with smooth arc-shaped curves and adding triangular reinforcing members. These modifications were evaluated in both 2D and 3D models.
Results: The findings showed that the proposed modifications significantly improved the specific energy absorption without altering the overall deformation mechanism. In the 2D models, improvements of 22% and 44% were observed, while in the 3D models, energy absorption increased by 41% and 66%. Smoother stress distribution and the elimination of sharp angles also delayed structural failure.
Conclusion: The results indicate that geometric modifications in re-entrant auxetic structures can effectively enhance their energy absorption performance, offering a practical approach for designing more efficient auxetic systems by combining these modifications.
کلیدواژهها English
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