Impact Characteristics and Energy Absorption of Recycled Rubber-chip Board

分离式霍普金森杆法(SHB)已被广泛应用于压缩冲击试验。然而，由于橡胶或软塑料等低机械阻抗材料的变形强度与工业金属材料相比非常小，且伴随着较大的变形，因此对橡胶或软塑料等低机械阻抗材料的SHB方法尚未建立。本研究的目的是研究橡胶芯片板试件及其由旧轮胎碎屑制成的制品的冲击试验方法和冲击能量吸收。在本研究中，首先，为了匹配所用材料与霍普金森杆之间的机械阻抗，并长期承受冲击，通过试验的方式设计和制造了落锤式霍普金森杆的大布置，在SHB中使用了直径45 mm、长2000 mm的PMMA杆作为输入杆、输出杆和打击杆。其次，制作了五种橡胶片试件，利用霍普金森杆装置进行了冲击压缩试验，并进行了静力试验。从一系列试验结果中发现，应变率对橡胶刨花板的冲击压缩强度有显著影响。此外，还对橡胶缓冲滚筒进行了冲击试验，讨论了缓冲滚筒对车辆碰撞的冲击力松弛和能量吸收。

The Split Hopkinson bar method (SHB) has been widely used for impact tests of compression. However, the SHB method for low mechanical impedance materials such as rubber or soft plastics has not been established, because that their deformation strengths are extremely small compared with those of industrial metal materials and they are accompanied with large deformation.The aim of this investigation is to examine the impact testing method and impact energy absorption for a rubber-chip board specimen and its manufactured products made from the chip of used vehicle tires. In the present study, first, the large arrangements of Hopkinson bar using a falling weight were designed and produced by way of trial In order to match the mechanical impedance between the employed materials and the Hopkinson bar, and take a long time impact, PMMA bars of 45 mm in diameter and 2000mm in length were utilized as an input bar and an output bar as well as a striking bar in the SHB. Second, Five kinds of rubber-chip specimens were fabricated and employed in impact compressive tests by the Hopkinson bar set-up, together with static tests. Consequently, reasonable results were repeatedly obtained and it was found from a series of the experimental results that the impact compressive strength of rubber-chip board was remarkably influenced by strain rates. Moreover, impact tests for a rubber cushion drum was carried out and discussed on relaxation of impact force and energy absorption against collision of vehicles