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Thickness-recovery behaviors of tufted artificial turf with long pile for static loading were examined. A novel thickness gauge with circular presser foot of 82mm diameter and capable of measuring thickness to an accuracy of 0.01 mm at standard pressure of 0.10 kPa was designed for tufted artificial turf with long pile. Static loading tests were carried out by using an equipment improved static loading machine as defined in ISO 3416. The static loading equipment was capable of applying a pressure of 50 kPa through a steel square pressure foot of 120mm×120mm. Experiments were conducted using samples tufted artificial turfs with long pile of five types to determine characteristics on thickness loss and recovery behaviors for static loading. Thickness-recovery behaviors obtained from each sample were able to use an approximation with exponential equation and apply the simplest Voigt element model. Retardation times calculated from a Voigt element equation considering thickness loss after prolonged recovery period of 24 hours indicated rational results.

Thickness-Recovery Behavior of Long Pile Tufted Artificial Turf for Static Loading