Comparison of Fracture Methodologies for Flaw Stability Analysis of Storage Tanks

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Fracture mechanics methodologies for flaw stability analysis of a storage tank were compared in terms of the maximum stable through-wall flaw sizes or ''instability lengths.'' The comparison was made at a full range of stress loading at a specific set of mechanical properties of A285 carbon steel and with the actual tank configuration. The two general methodologies, the J-integral-tearing modulus (J-T) and the failure assessment diagram (FAD), and their specific estimation schemes were evaluated. A finite element analysis of a flawed tank was also performed for validating the J estimation scheme with curvature correction and for constructing the finite element-based ... continued below

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LAM, POH-SANG April 5, 2004.

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Fracture mechanics methodologies for flaw stability analysis of a storage tank were compared in terms of the maximum stable through-wall flaw sizes or ''instability lengths.'' The comparison was made at a full range of stress loading at a specific set of mechanical properties of A285 carbon steel and with the actual tank configuration. The two general methodologies, the J-integral-tearing modulus (J-T) and the failure assessment diagram (FAD), and their specific estimation schemes were evaluated. A finite element analysis of a flawed tank was also performed for validating the J estimation scheme with curvature correction and for constructing the finite element-based FAD. The calculated instability crack lengths show that the J-T methodology that uses an estimated scheme, and the material-specific FAD, most closely approximate the result calculated with finite element analysis for the stress range that bounds those expected at the highest fill levels in the storage tanks. The results from the other FAD methods show instability lengths less than the J-T results over this range.

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  • Journal Name: Journal of Pressure Vessel Technology

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  • Report No.: WSRC-MS-2004-00209
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 824039
  • Archival Resource Key: ark:/67531/metadc782269

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  • April 5, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • May 5, 2016, 5:38 p.m.

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LAM, POH-SANG. Comparison of Fracture Methodologies for Flaw Stability Analysis of Storage Tanks, article, April 5, 2004; South Carolina. (digital.library.unt.edu/ark:/67531/metadc782269/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.