Influence of geometric imperfections of flange joints on the fatigue load of preloaded bolts

Okorn, Ivan; Nagode, Marko; Klemenc, Jernej; Oman, Simon

doi:10.1016/j.ijpvp.2024.105237

International Journal of Pressure Vessels and Piping

2024

DOI: 10.1016/j.ijpvp.2024.105237

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Influence of geometric imperfections of flange joints on the fatigue load of preloaded bolts

Ivan Okorn,

Marko Nagode,

Jernej Klemenc

et al.

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2024

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Cited by 4 publications

References 33 publications

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Modelling of Fluid Permeability at the Interface of the Metal-to-Metal Sealing Surface

Jaszak,

Oredsson,

Grzejda

2024

Materials

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This paper presents a method for modelling the permeability of fluid at the interface formed between flat parallel plates and the sharp-edged ridges of a metal gasket. This work was divided into three stages. In the first stage, numerical calculations simulating the deformation (compression of the gasket) were performed. The calculations were carried out using thermomechanical static analysis with commercial software. The purpose of these calculations was to determine the contact area of the gasket ridges with the plates, the deformation of the gasket ridges, and the reaction force resulting from the degree of compression of the gasket. In the second part of this work, analytical calculations were performed to estimate the tightness level. The analytical model proposed in this paper was based on Darcy’s equation, simulating fluid flow through a ring-shaped porous layer. The analytical model also took into account the shape of the roughness profile of the sealed surfaces. A mathematical Ausloos–Berman function based on fractal theory was used to represent it. In the last part of this work, experimental tests were carried out to determine the actual fluid permeability and thus verify the numerical and analytical calculations.

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Modelling of Fluid Permeability at the Interface of the Metal-to-Metal Sealing Surface

Jaszak,

Oredsson,

Grzejda

2024

Materials

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Examining the Effects on a Fatigue Life of Preloaded Bolts in Flange Joints: An Overview

Okorn,

Nagode,

Klemenc

et al. 2024

Metals

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The amplitude of a bolt load in dynamically loaded bolted flange joints depends on several factors: the resilience of the bolt and the clamping parts, the magnitude of the working load, the point of action of the working load, the way the working load is transferred from the structure to the bolt, the preload, and the geometrical imperfections of the contact surfaces of the joint. These factors are analysed in many papers, and they are covered in the VDI 2230 guideline and in standards. Fatigue curves (S-N curves) of bolts are determined by tests in which an ideal axial load is usually applied to the bolts. The effects of the bolt strength class, the thread manufacturing process, the surface protection, and the cross-section size on the fatigue strength of bolts are precisely defined. The main problem in the evaluation of bolted joints is the calculation of the actual stress, which is compared with the fatigue curves. Despite extensive research, fatigue-related bolt failures still occur in practise. This article provides a systematic overview of the influences that affect the fatigue of bolts. The conclusions are based on the research results of many authors and on our own analytical, numerical, and experimental investigations. The effects are illustrated using two practical examples of flange bolting. The assessment of fatigue according to Eurocode 3 and the VDI 2230 guideline is discussed in more detail.

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The Impact of the Polymer Layer Thickness in the Foundation Shim on the Stiffness of the Multi-Bolted Foundation Connection

Grzejda

2024

Modelling

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Finite element modelling of multi-bolted foundation connections used for the foundation of heavy machinery or equipment is presented. Connections made using different types of shims, with particular emphasis on polymer–steel shims, are investigated. The stiffness characteristics for the adopted models of multi-bolted foundation connections at the installation stage are described and compared. It is shown that the use of polymer–steel shims can result in a significant improvement in the stiffness of a multi-bolted foundation connection compared to a connection with a polymer shim, and in achieving a multi-bolted foundation connection with a stiffness similar to that of a connection with a steel shim (at a sufficiently low polymer layer thickness).

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Influence of geometric imperfections of flange joints on the fatigue load of preloaded bolts

Cited by 4 publications

References 33 publications

Modelling of Fluid Permeability at the Interface of the Metal-to-Metal Sealing Surface

Modelling of Fluid Permeability at the Interface of the Metal-to-Metal Sealing Surface

Examining the Effects on a Fatigue Life of Preloaded Bolts in Flange Joints: An Overview

The Impact of the Polymer Layer Thickness in the Foundation Shim on the Stiffness of the Multi-Bolted Foundation Connection

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