Abstract
The purpose of this study is to investigate the shock attenuation properties of long pile synthetic turf by modeling and simulation. Three types of sepecimens which have different hardness were used for comparing the shock attenuation properties. The hardness was controlled by the composite ratio of infill material, i.e. normal type specimen was formed by the sand and the rubber chip with 1:1 volume ratio, 2:1 for hard and 1:2 for soft. To identify the model parameters, multi-intensity multi-area impact test which was constructed by ten grades of impact intensities and five kinds of test feet were performed to each specimen. Although the identification accuracies were not so high, the parameter sets for the each specimen calculated from the identification could represent the differences of the specimens and simulate the FR (Force Reduction) values as shock attenuation properties against the landing impact of running. In conclusions, FR values decreased with increasing the impact duration at the same impact area and also decreased with increasing impat area at the same impact duration.
