مطالعه عددي جاذب انرژي شش‌ضلعي آلومينيومي پرشده با انواع سلول‌هاي پليمري

Hybrid structures have attracted significant attention in engineering applications due to their favorable mechanical properties an‎d low weight. In this study, a hybrid energy absorber consisting of an aluminum outer shell an‎d polymeric inner cells were investigated numerically. Aluminum was selec‎ted as the outer shell because of its high strength-to-weight ratio an‎d good formability, while PLA+ was used for the inner polymeric component. PLA+ not only offers biodegradability but also demonstrates improved mechanical behavior an‎d higher energy absorption capacity compared with conventional PLA, making it a suitable choice for the filler material. Furthermore, a hexagonal cross-section was chosen for the cell design to achieve appropriate cell density an‎d high geometric stability, thereby enhancing the overall performance of the structure. To eva‎luate the absorber’s efficiency, seven different cell geometries were modeled, an‎d each geometry was simulated under four different thicknesses, while the aluminum shell was kept constant in all cases. The results revealed that a thickness of 1.5 mm provided the best balance between energy absorption capacity, peak load, an‎d structural weight across all geometries. Among the examined configurations, the honeycomb geometry exhibited the highest energy absorption an‎d proved to be more efficient than the other shapes. Finaly, it can be concluded that combining a metallic shell with polymeric cells leads to an optimized an‎d efficient structure, as polymer-based components, because their low weight, possess high specific energy absorption, an‎d their integration with metals results in a lightweight an‎d effective hybrid energy absorber suitable for various engineering applications.

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