engleski

PARAMETRIC ANALYSIS FOR DETERMINATION OF FRACTURE MECHANICS PARAMETERS NEEDED FOR STRUCTURAL INTEGRITY ASSESSMENT OF PRESSURE VESSEL

This paper describes approach to parametric study of influence of geometric parameters of one pressure vessel to fracture mechanics parameters needed for structural integrity assessment, which is commonly performed in order to assess safety of operation of pressure vessel when certain damage of pressure vessel is present. Cylindrical pressure vessel is subjected to investigation and in critical place (nozzle connection to pressure vessel), where maximum stress occurs, is used to introduce damage to pressure vessel in form of crack in order to conclude how it affects the safe operation of pressure vessel. Geometrical parameters of cylindrical pressure vessel which have most influence to stress concentration factor are varied as well as geometrical parameters related to fracture parameters, primarily damage size in context of crack length and depth. Certain analytical solution of fracture mechanics parameters and parameters needed for structural integrity assessment exist but for relatively simple geometries. In this case for obtaining results a finite element analysis is used, since more complex geometries can by analysed. 3D parametric model for analysis is prepared in 3D CAD software and parametric finite element model is prepared in software for analysis using finite element method. Results of conducted finite element analyses are presented in form of diagrams and tables and how individual geometrical parameters of geometry and damage influence safe operation of pressure vessel is explained.

parametric analysis; fracture mechanics parameters; structural integrity; pressure vessel; finite element method

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