Abstract
Characterization of the mechanical behavior of cross-linked polyethylene (XLPE) commonly used in high voltage cable insulation was performed by an extensive set of isothermal uniaxial tensile relaxation tests. Tensile relaxation experiments were complemented by pressure-volume-temperature experiments as well as density and crystallinity measurements. Based on the experimental results, a viscoelastic power law model with four parameters was formulated, incorporating temperature and crystallinity dependence. It was found that a master curve can be developed by both horizontal and vertical shifting of the relaxation curves. The model was evaluated by making comparisons of the predicted stress responses with the measured responses in relaxation tests with transient temperature histories.
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Olasz, L., Gudmundson, P. Viscoelastic Model of Cross-Linked Polyethylene Including Effects of Temperature and Crystallinity. Mech Time-Depend Mater 9, 23–44 (2005). https://doi.org/10.1007/s11043-005-9002-x
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DOI: https://doi.org/10.1007/s11043-005-9002-x