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Mechanics of Fluid-Conveying Microtubes: Coupled Buckling and Post-Buckling

School of Mechanical Engineering, University of Adelaide, South Australia 5005, Australia
Department of Mechanical and Construction Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, UK
Author to whom correspondence should be addressed.
Vibration 2019, 2(1), 102-115;
Received: 18 January 2019 / Revised: 18 February 2019 / Accepted: 20 February 2019 / Published: 26 February 2019
PDF [3373 KB, uploaded 28 February 2019]


This paper investigates the coupled mechanics of a fluid-conveying microtube embedded inside an elastic medium and subject to a pretension. The fluid-structure interaction model of the microsystem is developed based on Lagrange’s equations for the open system of a clamped-clamped microtube. A continuation model is used to examine the nonlinear mechanics of this microsystem prior to and beyond losing stability; the growth and the response in the supercritical regime is analysed. It is shown that the microtube stays stable prior to losing stability at the so-called critical flow velocity; beyond that point, the amplitude of the buckled microsystem grows with the velocity of the flowing fluid. The effects of different system parameters such as the linear and nonlinear stiffness coefficients of the elastic medium as well as the length-scale parameter and the slenderness ratio of the microtube on the critical speeds and the post-buckling behaviour are analysed. View Full-Text
Keywords: conservative system; post-divergence; microtube; small size effect; elastic bed conservative system; post-divergence; microtube; small size effect; elastic bed

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Farajpour, A.; Farokhi, H.; Ghayesh, M.H. Mechanics of Fluid-Conveying Microtubes: Coupled Buckling and Post-Buckling. Vibration 2019, 2, 102-115.

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