Numerical Analysis of Stress Concentration in Non-uniformly Corroded Small-Scale Specimens
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RESEARCH ARTICLE
Numerical Analysis of Stress Concentration in Non-uniformly Corroded Small-Scale Specimens J. Kodvanj 1 & Y. Garbatov 2 & C. Guedes Soares 2 & J. Parunov 1 Received: 1 February 2020 / Accepted: 6 June 2020 # Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A numerical evaluation of stress concentrations of corroded plate surfaces of small-scale corroded steel specimens is compared with the experimentally estimated ones. Eleven specimens were cut from a steel box girder, which was initially corroded in real seawater conditions. The surface of all corroded specimens was analysed applying photogrammetry techniques, and a statistical description of an idealised corroded surface of each specimen was established. Fatigue lives of specimens are determined from the fatigue tests. Based on experimentally obtained fatigue lives, the stress concentration factors are calculated concerning the ideally smooth specimens. The correlation between the statistical parameters of the corroded specimen surfaces and the estimated stress concentration factors is analysed. Idealised corroded surfaces, converted in graphical format, are then used for the finite element modelling in ABAQUS software, and stress concentration factors are estimated from the finite element results. A convergence study is performed to determine the appropriate finite element mesh density. Comparison between experimentally obtained and numerically estimated stress concentration factors is performed as well as correlation analysis between actual and finite element predicted crack locations. Keywords Fatigue life . Fatigue tests . Corrosion . Stress concentration factors . Finite element method
1 Introduction Corrosion and fatigue cracking may be the two most important types of damage in ageing ship structures, which lead to
Article Highlights • A numerical evaluation of stress concentrations of corroded steel specimen surfaces is analysed and compared with the experimentally estimated ones. • Photogrammetry techniques are used to analyse the corroded surface of specimens. • Fatigue lives of specimens are defined based on fatigue tests. • Comparison between experimentally and numerically estimated stress concentration factors is performed as well as correlation analysis is performed. * Y. Garbatov
1
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Zagreb, Croatia
2
Centre for Marine Technology and Ocean Engineering (CENTEC), Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
surface roughness, reduction of the plate thickness and strength and eventually to leakage and structural failure. Corrosion in ship structures has an essential role in longterm structural integrity. Under conditions of high temperature, improper ventilation, high stress concentration, high stress cycling, very high rates of corrosion can be achieved in spaces such as ballast tanks and at specific structural details such as horizontal stringer
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