Theoretical Analysis And Experimental Research Of Dynamic Performance Of Wood Rubber Shock Absorber For Vehicle

Since the 20th century, the amount of vehicle rubber products increased year by year, especially rubber shock absorbers. This situation maked the waste rubber products more and more. The environmental pollution of waste rubber is very serious, and it is difficult to recycle and reuse. For the drawbacks of waste rubber hard to break down and reuse, this paper presented that the wood rubber would be used for vehicle shock absorber, this idea was put forword basing on the concept of wood rubber that was proposed by Professor Ma come from the Northeast Forestry University.Wood rubber was molded by adhesive and Micron Wood Fiber, it was a composite material which had both the mechanical properties and material characteristics of wood and rubber at the same time. The molding process of vehicle wood rubber shock absorber were determined after studied the conventional molding process of micro wood molded products, then the specimen of vehicle wood rubber shock absorber were fabricated which standard was φ25mm×32mm and φ8mm×8mm, glue mixing amount was 40% and 60%. The static compression experiment of different compression times and different compression speed were did by the CMT5504 electronic universal testing machine, and the static characteristics and energy absorption of two kinds of mixed glue vehicle wood rubber shock absorber were studied by observing the curves which obtained by using Origin software to process the experimental data.Split Hopkinson pressure bar was used to do the dynamic compression test on the specimens of two kinds of mixed glue wood rubber shock absorber and chloride butyl rubber, for comparing the dynamic mechanical properties of the three specimens. The dynamic compression experiments were carried out at room temperature, strain rate were 1500s-1,2000 s-1,2500s-1,3000s-1. Then the stress-strain curves of three specimens under four different strain rates were obtained by using Origin and Matlab software to process the experimental data. After analyzed the dynamic mechanical properties of the three specimens by comparing the stress-strain curve obtained, this paper did macroscopic and microscopic observation for the specimen of the vehicle wood rubber shock absorbe rglue amount was 40%, so as to analyzed failure mode of the specimens.The Johnson-Cook constitutive equation was selected to describe the constitutive relation of two kinds of mixed glue vehicle wood rubber shock absorber, and its parameters were determined basing on the experimental data of static and dynamic mechanics experiment. Then compared the experimental curve and the curve of Johnson-Cook constitutive equation to determine whether the describe of vehicle wood rubber shock absorber constitutive relation by the Johnson-Cook constitutive equation was it right or not. Finally, the Ansys/Ls-dyna program was used to simulate the dynamic compression test of vehicle wood rubber shock absorber, and researched the feasible of the Ansys/Ls-dyna program simulation for vehicle wood rubber shock absorber SHPB experiment by observing the coincidence degree of the stress-strain curves obtained from the simulation and SHPB experiment.This paper laid a theoretical foundation for the application of vehicle wood rubber shock absorbers by studying the dynamic mechanical properties and obtaining the Johnson-Cook constitutive equation of vehicle wood rubber shock absorbers.