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- W4387611385 abstract "Nonbonded flexible pipes consist of polymer materials that experience stress relaxation at high temperatures, which ultimately affects the sealing performance of end sealing systems. To assess stress relaxation curves under varying temperatures and pre-strains, this paper conducts both tensile and stress relaxation tests on PVDF materials. To describe the stress relaxation characteristics of these materials, the Prony series is utilized. In order to identify the parameters of the series, the paper employs the Levenberg-Marquardt method of nonlinear regression. A finite element model is established to verify the accuracy of the parameter identification method. Subsequently, the paper establishes a two-dimensional axisymmetric finite element model of the sealing system in the end fitting, while taking into account fluid pressure inside the pipeline using a pressure penetration method. The impact of stress relaxation on the sealing performance is then discussed. Finally, the paper alters the coefficients of the Prony series to explore their significance on the sealing performance of the sealing system." @default.
- W4387611385 created "2023-10-14" @default.
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- W4387611385 date "2023-10-01" @default.
- W4387611385 modified "2023-10-16" @default.
- W4387611385 title "A numerical model for stress relaxation analysis of sealing systems in nonbonded pipe end fittings" @default.
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- W4387611385 doi "https://doi.org/10.1016/j.joes.2023.10.001" @default.
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