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Creep damage mechanisms in gas pipes made of high density polyethylene

Pusz A., Michalik K.

Archives of Materials Science and Engineering

2009

Vol. 36, nr 2

89-95

Purpose: The purpose of this article is to present results of creep damage mechanisms in gas pipes made of high density polyethylene [HDPE]. High density polyethylene has been widely used in the piping industry as raw material. Even though there are large numbers of experimental and analytical investigations on HDPE, few of them have examined the effects of manufacturing techniques on the small and finite deformation behaviors of HDPE. Since HDPE is semi-crystalline polymeric material the rate of crystallinity, molecular morphologies and molecular structure extensively influence its mechanical behaviors. Design/methodology/approach: Tensile creep experiments on HDPE with a duration of examinations from four till nine days were performed at temperature of 20°C. Findings: In this study, findings are indicating differences of the property in individual layers walls of the pipe. Research limitations/implications: Applying this method is limited to thermoplastic materials. Practical implications: Presented method can be applied for other thermoplastic materials in the future. Originality/value: The expressed method can be applied in the future for developing the research on the process with creeping of polymers.