Abstract: In order to improve the long-term stability of high-density polyethylene (PE-HD) structural foaming engineering, the constitutive relation of PE-HD structural foam including strain rate and density was established on the basis of Sherwood-Frost model. Based on the tensile stress and strain curve of plastic foamed, the related parameters were fitted via a numerical method. A comparison between the calculated and experimental values indicated that the proposed constitutive model may describe the stress-strain relationship of PE-HD.

Key words: high-density polyethylene, structure foam, tensile, constitutive relation, parameter