Experimental Study of the Compressible Behavior of Low-Density Polyurethane Foam

The compressive stress-strain behaviors of polyurethane foams in four different mass densities have been tested by SHPB at strain rates of 1103～5103 s-1. Experimental results show that the compressive behavior of the polyurethane foam is sensitive to the strain rates between quasi-static experiments and SHPB experiments. However, the behavior is not sensitive to the strain-rate under condition of dynamic compression. A experiential constitutive relation, which considers density effect of the foams on materials features at high strain-rates, has been proposed based on Sherwood model. The relation is well agreed to the experimental data.