Abstract
High-Density Polyethylene (HDPE) is used in many industries with many applications from automotive industry to biomedical implants. It can be manufactured using different processing techniques including compression molding, injection molding, and blow molding. Multiaxial loading and non-proportionality between different loading sources are inevitable in many applications. It is shown that the common multiaxial fatigue criteria such as von Mises equivalent stress are not able to correlate the multiaxial fatigue data. In this study, multiaxial fatigue behavior of neat HDPE is investigated using hollow tubular specimens through experimental fatigue tests. Axial, torsion, and combined in phase and out-of-phase axial-torsion fatigue tests were conducted. Stress concentration effect on multiaxial fatigue behavior was also studied. Experimental results and analytical models used to account for the aforementioned effects are presented and discussed in this paper.
Highlights
Application of polymers in different industrial applications has been increasing in recent decades, assessment of their mechanical behaviour is important in many design situations
Plastic components must function during service life without failure under cyclic loading
They need to be designed based on cyclic service loads considering different effects including multiaxial stress state and stress concentrations
Summary
Application of polymers in different industrial applications has been increasing in recent decades, assessment of their mechanical behaviour is important in many design situations. Plastic components must function during service life without failure under cyclic loading. They need to be designed based on cyclic service loads considering different effects including multiaxial stress state and stress concentrations. Global demand for HDPE resins has been increasing, going from 11.9 million tons in 1990 to 43.9 million tons in 2017 with annual growth of 3.3% [1]. Molecular constitution and microstructural aspects like the degree of crystallinity, crystal size, and crystal orientation are essential to determine mechanical response of polyethylene. On the other hand, increasing molecular weight and branching reduce crystallinity
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