Crashworthiness Analysis of Novel Polygonal Multicellular Tubes Filled With Lotus‐Root Pore Structures

Thin‐walled structures have received considerable attention in various engineering disciplines due to their lightweight characteristics and exceptional crashworthiness. This paper adopts a biological perspective to enhance the performance of thin‐walled structures by integrating lotus root structures with polygonal configurations. It introduces the quadrilateral‐derived lotus‐root thin‐wall (QDLT) and the hexagon‐derived lotus‐root thin‐wall (HDLT). Compared to conventional thin‐walled tubes, the proposed structures exhibit enhanced impact resistance under identical wall thickness and mass conditions. Particularly, under the same wall thickness, the specific energy absorption is 8.02 times higher than that of the conventional hexagonal tube. Furthermore, parametric studies on the HDLT indicate that variables such as the number of layers, mass, wall thickness, and cross‐sectional characteristics of different layers significantly affect the structure's crash performance. Notably, with a wall thickness of 0.4 mm, the HDLT‐3 achieves a crash force efficiency of up to 97.35%. Furthermore, the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) was employed to perform multi‐objective optimization on the structural design, thereby screening out the configuration with the optimal comprehensive performance. Finally, comparative analyses with other multi‐tube structures demonstrate that all proposed designs exhibit superior impact resistance.