Rheological Aspects of Multilayered Thick-Wall Polymeric Pipes under the Influence of Internal Pressure

Abstract:

Rheologic of a polymer pipe from cyclic temperature and internal pressure in one-dimensional and two-dimensional formulations is considered. The resulting equations of the finite element method allow one to calculate both single-layer and multilayer thick-walled pipes taking into account creep. In the calculation, the temperature dependences of the elastic and rheological parameters of polymer pipes were used. The effect of variable thermal conditions on the VAT of a PVC pipe is investigated. It has been established that under unsteady thermal conditions, stresses can occur significantly higher than in a stationary temperature field. This is explained by the fact that polymers have a component of deformation that is lagging in phase from stresses (highly elastic deformation).

• Periodical: Key Engineering Materials (Volume 869)
• Pages: 209-217
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.869.209
• Online since: October 2020
• Authors: Serdar B. Yazyev*, Stepan Litvinov, Anastasia E. Dudnik, Irina G. Doronkina
• Keywords: Elastic Modulus, Finite Element, High Density Polyethylene, Lagrange Variational Principle, Material Creep, Multilayer Polymer Pipes, Polyesters, Reinforcing Layer, Rheology, Temperature Field Normal Stresses, Thermal Conditions

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