RESEARCH PAPER
Fem analysis of pressure vessel with an investigation of crack growth on cylindrical surface
1
Faculty of Mechanical Engineering The University of Belgrade Kraljice Marije 16, Belgrade, Serbia
Publication date: 2018-09-30
Eksploatacja i Niezawodność – Maintenance and Reliability 2018;20(3):378-386
KEYWORDS
ABSTRACT
To ensure reliability of pressure vessels during service it is necessary to (1) know properties of materials used in their design
and (2) evaluate vessels’ behaviour under different working conditions with satisfying accuracy. Due to various technical and/
or technological requirements, nozzles are usually welded on vessel’s shell producing geometrical discontinuities that reduce
the safety factor. To evaluate their influence, vessels with two different nozzles were experimentally studied and critical areas
for crack initiation have been identified by 3D Digital Image Correlation (DIC) method. After that, the numerical analysis of
equivalent 3D finite element model was performed and obtained results were compared with experimental values. In the most
critical area, next to the one of the nozzles, crack was initiated and then growth of the damage was simulated using extended
finite element method (XFEM). In this paper evaluation of stress intensity factors (SIFs) along crack path is presented, as well
as the most probable direction of the crack propagation on the shell. Based on SIFs values, critical length of the crack and
number of pressure cycles to the final failure were estimated.
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CITATIONS (13):
| eISSN: | 2956-3860 |
| ISSN: | 1507-2711 |
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