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Enhanced cyclic fracture mechanics tests to examine morphological and molecular results on slow crack growth in contemporary PE pipe grades

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International Journal of Applied Science and Information Science, 2022

Autour(s)

  • Zheng Xiang, Bing Pan, Lixuan Zhang, Chang Li, Don Chen, Lee Chen

Abstract

Three different polyethylene pipe grades and three different lots of one PE pipe material were investigated with fracture mechanics procedures under cyclic and impact loads. The cyclic tests with Cracked Round Bars allowed a ranking of the different PE pipe grades and lots concerning crack resistance as a function of failure time as well as of crack initiation time. The ranking corresponded to the expectations based on the molecular and morphological properties of the materials. Concerning lot- to-lot variations, in particular, a correlation to crystallization kinetics, melt flow rate and density measurements could be established.

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