STRESS CONCENTRATION AROUND PERFORATIONS PRODUCED BY CORROSION IN STEEL STORAGE TANKS

Authors

  • LUIS A. GODOY CONICET AND UNIVERSIDAD NACIONAL DE CORDOBA
  • ADRIAN BOCCARDO MECHANICAL ENGINEERING DEPARTMENT AND CIII, FACULTAD REGIONAL CóRDOBA, UTN
  • FRANCISCO RODRIGUEZ MECHANICAL ENGINEERING DEPARTMENT AND CIII, FACULTAD REGIONAL CóRDOBA, UTN
  • PATRICIA M DARDATI MECHANICAL ENGINEERING DEPARTMENT AND CIII, FACULTAD REGIONAL CóRDOBA, UTN

Keywords:

FINITE ELEMENT ANALYSIS, OIL TANKS, CORROSION, STEEL TANKS, STRESS CONCENTRATION FACTORS

Abstract

THIS PAPER PRESENTS NUMERICAL RESULTS OF STRESS CONCENTRATION FACTORS FOR PLATES PERFORATED BY CORROSION. EVIDENCE FROM 25 PLATES WITH CORROSION PERFORATION CONSIDERED SHOW THAT TYPICAL SHAPES MAY BE CHARACTERIZED AS A DEVIATION FROM AN ELLIPSE OR FROM A CIRCLE. IN ORDER TO MODEL TYPICAL PERFORATIONS CREATED BY THIS TYPE OF CORROSION, HOLES WITH NON-CIRCULAR BOUNDARIES HAVE BEEN CONSIDERED IN THE FORM OF COSINE SHAPE AND VARIATIONS FROM IT. TWO LOAD CASES ARE INVESTIGATED: UNIAXIAL AND SHEAR STRESS FIELDS IN AN ELASTIC PLANE STRESS PROBLEM. THE INFLUENCE OF THE AMPLITUDE OF DEVIATION WITH RESPECT TO AN ELLIPSE OR CIRCLE AND THE LOCAL CURVATURE OF THE INTERNAL BOUNDARY OF THE HOLE ARE STUDIED. A SIMPLIFIED MODEL OF AN EQUIVALENT ELLIPSE ORIGINALLY PROPOSED BY NISHIDA IS SHOWN TO PROVIDE GOOD ESTIMATES FOR STRESS CONCENTRATION FACTORS FOR A RANGE OF SHAPES INDUCED BY CORROSION.

Author Biography

LUIS A. GODOY, CONICET AND UNIVERSIDAD NACIONAL DE CORDOBA

PROFESSOR, STRUCTURES DEPARTMENT, NATIONAL UNIVERSITY OF CORDOBA, AND INVESTIGADOR SUPERIOR, CONICET

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Published

2014-07-05

Issue

Vol. 11 No. 10 (2014)

Section

Articles

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