Uniaxial tension and tensile creep behaviors of EPS

摘要

The mechanical behavior of EPS (Expanded polystyrene) with three densities at room temperature and under tension loading was studied. The results show that EPS material is characterized by brittle behavior in the tension tests, and tensile properties of EPS increase with the increase of density. Volume fraction has no a significant effect on the modulus of these foams. The tensile creep strain increases with stress for EPS with same density, indicating that the creep behavior is of the stress dependency. And the creep behavior of EPS exhibits density dependency, which the creep strain decreases with densities for a fixed stress value. Moreover the creep behavior under the constant tension load is well in coincidence with the three-parameter solid model.