Abstract
Dynamic property of polyurethane foam is investigated experimentally. Polyurethane foam is loaded periodically with various amplitudes and various frequencies, and load, deflection and velocity of the polyurethane foam are measured. Measured data are analyzed by non-parametric identification technique in time domain, and internal force is obtained as a function of velocity and deflection. It is shown by analysis results that the dynamic property of the polyurethane foam is hysteretic, and internal force is a function of deflection as well as velocity. Then, based on the result, a simple approximate equation of internal force is proposed.
