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Vol.14, No.2, 2014, pp.125–132 |
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METHODOLOGY FOR RESIDUAL LIFE ESTIMATION OF DAMAGED STRUCTURAL ELEMENTS OF THE TOWER INSTALLATIONS FOR OIL AND GAS EXPLORATION Milenko S. Stašević1, Stevan Maksimović2, Katarina D. Gerić3, Mirko S. Maksimović4, Ivana Vasović5 1)Zrenjanin, Serbia, milenkostasevic@sbb.rs 2)VTI-Aeronautical Department, Belgrade, Serbia 3)University of Novi Sad, Faculty of Technical sciences, Serbia 4)Belgrade Waterworks and Sewerage, Serbia 5)Institute GOŠA, Belgrade, Serbia |
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Abstract Attention in this paper is focused on the establishment of a suitable and computational methodology for estimating the remaining life of structural elements in the presence of initial damage. Damaged model occurs in the form of a cracked model for the analysis of crack growth in structural components of the tower installations for oil and gas exploration. In this work two numerical simulation approaches for crack propagation are presented. The first approach is based on the conventional Paris law of crack propagation, while the other utilizes the Strain Energy Density (SED) method during the crack growth analysis. For material, steel S355 JR, used in the research, fatigue low-cycle material properties and Paris dynamic constants for crack propagation analysis have been determined experimentally. Two computational methods for crack propagation based on Paris and SED methods are illustrated by the representative structural element of the construction of the tower that is considered in the form of a plate with a hole and initial crack. For crack growth and residual life estimation here “in-house” software package “PP_VEK” is used. After verification of the Paris and SED models, the residual life of oil tower construction under real load spectrum is considered here. Keywords: fatigue, oil tower, crack growth, residual life estimation, computation methodology |
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full article (362 KB)
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