Determination of Ultimate Dimensions of Crack-Like Defects in a Wall of Vertical Steel Tanks with Specified Volume of 20000m³

Abstract:

The paper studies the stress-strain state of a surface longitudinally oriented crack in the wall of a vertical steel tank with specified volume of 20,000 m³. Surface non-through cracks are one of the main causes of tank failure. The prognostication of the crack critical dimensions requires analytical expression for the K-calibration function. K-calibration function is the dependence taking into account the change in dimensions, location of a defect and geometrical peculiarities of the structure as well. The calculation of the stress-intensity factor (SIF) of a surface longitudinally oriented crack located in the tank wall was performed using ANSYS Mechanical software. The cracks with various dimensions were studied by generating global finite-element model of the tank and a sub-model of the tank ring with a crack. MATLAB software was implemented to derive analytical expressions for K-calibration function of cracks with different shape located in the wall of vertical steel tank. All expressions for the K-calibration function are described by a polynominal function that allows estimating the critical size of a defect. The work results could be interesting for oil industry engineers.

• Periodical: Key Engineering Materials (Volume 743)
• Pages: 162-165
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.743.162
• Online since: July 2017
• Authors: Anastasiya Lyagova*
• Keywords: Crack, Critical Size Crack, Stress Intensity Factor, Vertical Steel Tank

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