Lubis, Asnawi and Akmal, Jamiatul and Putra, Muhammad Rahardian and Tanti, Novri and Suudi, Ahmad (2021) Stress Assessment on Layered Bonding Tube under Hydrostatic External Pressure. In: Seminar Nasional Tahunan Teknik Mesin (SNTTM) ke-19, 13-14 Oktober 2021, Universitas Muhammadiyah Yogyakarta, Yogyakarta. (In Press)

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Abstract

Cylindrical structures are widely used in engineering applications, such as pressure vessels, piping systems and underground transport structures. Another application of cylindrical structures (tubes) is for inter-island transportation constructed as a submerged floating tunnel (SFT). The main structure of the SFT is a layered bonding tube and a mooring rope to resist buoyancy. For this application, the tubes (tunnels) subjected to external (hydrostatic) pressure and buoyancy force from seawater. This paper presents the results of a stress assessment on a layered cylindrical tube under an external hydrostatic pressure load from seawater. Modeling and analysis were carried out using the ANSYS finite element method. The tube material consists of three layers: the innermost layer is steel with a thickness of 30 mm, the middle layer is concrete with a thickness of 450 mm and the outermost layer is aluminum with a thickness of 150 mm. The inner and outer diameters of the tube are 5m and 6.26m, respectively, and the length of the tube is 25m. The element types used are SOLID186, CONTA174, TARGET170, and SUFR154. The boundary conditions are fully-fixed at both ends of the tube. The working load is internal pressure of 101 kPa and external hydrostatic pressure at a depth of 500m of 5.35 MPa. The results showed that the greatest hoop stress occurred in steel layer, followed by aluminum layer and concrete layer. For radial stress which is a compressive stress, the largest value is found in the aluminum layer and the smaller value goes to the innermost layer (steel). For shear stress, the stress was much smaller in the steel and concrete layers, compared to the stress in the aluminum layer.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: cylindrical structure, layered cylinder, SFT, hoop stress, radial stress, shear stress.
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Fakultas Teknik (FT) > Prodi Teknik Mesin
Depositing User: Dr Asnawi Lubis
Date Deposited: 04 Nov 2021 01:14
Last Modified: 04 Nov 2021 01:14
URI: http://repository.lppm.unila.ac.id/id/eprint/34968

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