ENERGY ABSORPTION CHARACTERISTIC OF BIOMIMETIC BAMBOO THIN-WALLED TUBE STRUCTURE FOR CAR CRASH BARRIERS

ZHANG HaiYan; ZHOU GuoHua

doi:10.16579/j.issn.1001.9669.2024.04.010

Abstract：Based on the macroscopic and microscopic structural characteristics of bamboo,two bionic bamboo structures were proposed:a thin-walled tube with variable wall thickness with reinforcing joints(Tube-a)and a thin-walled bamboo-like tube with ribs in a double circle(Tube-b).The energy absorption characteristics of the bionic structures under three-point bending loading were investigated with the help of Abaqus tool,and the conventional circular tube structure was introduced for comparative analysis.The results show that Tube-b has the best performance,its peak crushing force is reduced by about 18.396%compared with the circular tube structure,and its specific energy absorption and energy absorption efficiency are improved respectively by about 50.8%and 38.797%.To further investigate the energy absorption characteristics of the bamboo-like structure,the effects of parameters such as loading angle,wall thickness property α and cross-section property β on the energy absorption characteristics of Tube-b were explored.It is found that the comprehensive performance of Tube-b is better under 0°～20° loading;the energy absorption efficiency of Tube-b can be improved appropriately by adjusting the wall thickness property,and the specific energy absorption of Tube-b can be improved appropriately by adjusting the cross-section property.This study can provide some references for the design of improving the energy absorption characteristics of thin-walled structures.