A novel energy absorber based on magnetorheological gel

作者：Pang, Haoming; Xuan, Shouhu; Sun, Chuanlin; Gong, Xinglong^*

来源：Smart Materials and Structures, 2017, 26(10): 105017.

DOI：10.1088/1361-665X/aa834c

• energy absorber
• magnetorheological gels
• structure design
• tunable piston gap
• impact

In this work, a novel magnetorheological energy absorber (MREA) was designed by using magnetorheological gel (MRG) as the damping medium. The proposed MREA had tunable piston gap distances and variable inner magnetic flux density distribution. The piston gap distance could be varied from 7-2 mm and the magnetic flux density at the gap increased from 120-860 mT, respectively. Under both low velocity compression and high speed impact, the damping could be divided into three parts. In the impact test, the velocity of a drop hammer could be reduced from to 3.4-0 m s(-1) within a very short time (13 ms) and distance (17 mm). The maximum damping force of the MREA reached to as high as 8 kN. The damping force could also be adjusted by changing the current input. Under a 2 A current, the energy absorption ratio increased about 23% (from 4.13-5.07 J mm(-1)).

• 出版日期2017-10
• 单位中国科学院; 中国科学技术大学