Yu Pu, Yu Zhefeng, Zhou Xiang, Xu Wu
Shanghai Aircraft Manufacturing Co., Ltd., Shanghai 201324, China.
Aerospace Structure Research Center, School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China.
Materials (Basel). 2023 Sep 24;16(19):6378. doi: 10.3390/ma16196378.
This study presents a novel shock absorber with an inward-inverting composite foam-filled tube. Under the compression of a pressing cap and the action of an internal inversion cap, the composite tube inverted inward. During the crushing, the fronds of the composite tube compacted the foam, thereby enhancing the energy absorption. Three types of foams were applied to the absorber, and a drop-weight impact test was performed to obtain the assessment parameters. The foam increased the specific energy absorption (SEA) of the composite tube to 103 kJ/kg. Finite-element simulation based on the user-defined material subroutine was performed for the initial failure and stable stages of the crushing, and a foam model was identified through the experimental data. The mean crush force from the simulation agreed with the experimental data, and the SEA maximum error was <7%, thus validating the crush simulation of the proposed shock absorber. The development of the damage modes of the plies was analyzed based on the simulation results, showing a good energy absorption mechanism of this shock absorber.
本研究提出了一种新型减震器，其具有向内翻转的复合泡沫填充管。在压盖的压缩和内部翻转盖的作用下，复合管向内翻转。在挤压过程中，复合管的叶片压实泡沫，从而增强能量吸收。三种类型的泡沫被应用于该减震器，并进行了落锤冲击试验以获得评估参数。泡沫使复合管的比能量吸收（SEA）提高到103 kJ/kg。基于用户定义材料子程序对挤压的初始失效和稳定阶段进行了有限元模拟，并通过实验数据确定了泡沫模型。模拟得到的平均挤压力与实验数据相符，SEA最大误差<7%，从而验证了所提出减震器的挤压模拟。基于模拟结果分析了层合板损伤模式的发展，表明该减震器具有良好的能量吸收机制。
