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FEM modelling of fatigue loaded bolted flange joints

Smolnicki T., Rusiński E., Karliński J.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 22, nr 1

69-72

Purpose: The main purpose of this paper is to describe the modelling of large flexible objects in which bolted joints are used and also to present a new FEM calculation methodology of these objects. Design/methodology/approach: In bolted flange joints of flexible constructional elements, bolts are subject not only to tension and torsion but also to bending. Identification of straining of each bolt is only possible by means of numerical methods e.g. the finite element method FEM. In case of large objects, the calculation problem is faithful projection of the phenomena taking place in direct zone of the contact of screw-nut pair. The application of global equivalent models of the whole joint is necessary, to make it possible to precisely determine internal loads in individual bolts and then local models to determine stress fields necessary to assign durability. Calculation methodology based on the construction of two coherent models has been described: global - of an entire flange joint and local - of a single bolt joint. Findings: The elaborated methodology was applied to estimate the flange joint in the heat exchanger with rotating heating surfaces that was subject to damage. The causes of damage of flange joint were found. Practical implications: Used methodology of FEM modelling of bolted flange joints based on two coherent models may be applied for different similar objects. The paper provides detailed description of methodology steps. Originality/value: The described methodology may be successfully applied to the analysis of large objects, however, significant geometric features with dimensions small in relation to dimensions of the whole object. Thanks to the application of to coherent models, it is possible to reflect all essential phenomena in the FEM model, both in the global scale - of the entire object, and local - a significant fragment of the joint.

Likwidacja nieszczelności na połączeniach kołnierzowych w czynnych sieciach gazowych niskiego i średniego ciśnienia

Stochaj P.

Nafta-Gaz

2004

R. 60, nr 3

156-161

W artykule dokonano ogólnej charakterystyki dotychczasowych tradycyjnych sposobów napraw połączeń kołnierzowych w gazociągach stalowych i polietylenowych. Przedstawiono sposób usuwania nieszczelności występujących na połączeniach kołnierzowych w czynnych sieciach gazowych niskiego i średniego ciśnienia za pomocą materiałów polimerowych.

In the publication the general characteristics of so far traditional repair methods of flange joints in steel and polyethylene gas pipelines has been presented. The new method of leakage repair in live low and medium pressure gas pipelines using polymer materials has been described.