Evaluation of durability of buried polyethylene pipelines and tanks with a cellular wall

Article type: Research Article

Authors: Stashchuk, Mykola^{; *} | Ivanitskyj, Yaroslav | Dorosh, Maryan | Molkov, Yuriy | Lenkovskiy, Taras

Affiliations: Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5 Naukova Street, Lviv 79060, Ukraine

Correspondence: [*] Corresponding author. Tel.: +380322296697; E-mail: [email protected].

Abstract: The durability of cylindrical thin-walled structures with a cellular wall are investigated. Such structures are modelled as orthotropic shells with modified rigidity. A system of differential equations for finding the forces and moments arising in the wall of a thin orthotropic shell is written. Key equations to estimate the stress components are established. The finite element method was used for stress-strain state of cellular structure evaluation. A comparison of theoretical results with experimental results obtained by digital image correlation method is given. The recommendations on the design of buried pipes and vertical tanks with a cellular wall are developed.

Keywords: Polyethylene pipelines and tanks, durability, stress-strain state, orthotropic shells, finite element method, digital image correlation

DOI: 10.3233/SFC-170203

Journal: Strength, Fracture and Complexity, vol. 10, no. 2, pp. 73-88, 2017