Impact Characteristics and Energy Absorption of Recycled Rubber-chip Board

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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