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Cite as: Rev. Chim.
https://doi.org/10.37358/Rev.Chim.1949

OSIM Nr. R102355
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Revista de Chimie (Rev. Chim.), Year 2015, Volume 66, Issue 5,





Valeriu V. JINESCU, Vali - Ifigenia NICOLOF, Cosmin JINESCU, Angela CHELU
Superposition of Effects in Calculating the Deterioration
of Tubular Structures and in Non-newtonian Fluid Flow

Abstract:

The paper outlines the superposition of effects by resorting to the principle of critical energy in both tubular structures as well as in non-Newtonian fluid flow. A relation is proposed for the calculation of critical stress in a cracked specimen, by considering the concept of deterioration; - one determines the amount of deterioration caused to tubular specimens under static loading, depending on the crack geometry and position; - relationships have been proposed for calculating deterioration by considering the crack depth and length. Considerations refer to specimens under one single load (axial force or bending moment) as well as specimens under two simultaneous loads (axial force and bending moment). We put forth a relation for the superposition of the Couette flow effects and the Poiseuille pressure flow effects of a non-Newtonian fluid. The theoretical results have been accounted for by experimental data. Keywords: deterioration; superposition of effects, tubular structures, cracks, non-Newtonian fluid flow


Issue: 2015, Volume 66, Issue 5
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