Assessing the reliability of thread joints under variable loads

Савкин, А. Н.

doi:10.3103/s105261880704005x

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…There are also several papers on the evaluation of the reliability of bolted connections, or larger structures with these connections. However, they do not take into account the influence of temperature on reliability, but rather relate to the assessment of fatigue reliability [26,30,41].…”

Section: Introductionmentioning

confidence: 99%

Thermal strength analysis of a steel bolted connection under bolt loss conditions

Grzejda¹

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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The aim of the paper is to analyse an exemplary bolted connection under the conditions of loss of bearing capacity of some fasteners in the connection. The presented tests are numerical and concern an asymmetric bolted connection. The joined elements in the connection were modelled as 3D finite elements, and the fasteners were treated as hybrid models consisting of rigid heads and nuts, and flexible beams between them. The bolted connection was first preloaded according to six different tensioning orders using a standardised force. After all bolts were tensioned, the selected bolts were removed, simulating bolt damage. The connection was then tested for external loads with temperatures ranging from 20 to 600°C. The influence of loosening the connection on the load in the remaining bolts at the operational stage of the connection was investigated. The calculation results were compared with the test results for a healthy bolted connection. It was shown that the bearing capacity of the connection in the damaged state decreased by 13%.

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Section: Introductionmentioning

confidence: 99%

Thermal strength analysis of a steel bolted connection under bolt loss conditions

Grzejda¹

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…The most important effects of these deformations are the strain hardening of the surface layers. Since these plastic deformations affect the service life of the final product, various researches have been conducted in this field [1][2][3][4][5][6][7][8][9][10][11][12], in these studies, the effects of machining parameters on strain hardening in the surface layers of the machined workpiece has been investigated experimentally and theoretically. In some materials, work hardening adversely affects the machining process, and consequently, the temperature and machining forces increase during the cutting operation.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling of work hardening of duplex steel alloys in milling process

Mohammadi

Amirabadi

2021

Preprint

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Sever plastic deformation in cutting operations such as milling, might change mechanical properties of the machined surface. This study presents an analytical model to calculate work hardening of the upper layers of the workpiece in the milling process of 2205 duplex stainless steel. In this regards, the stresses in the cutting regions are calculated to find the stress and temperature fields in the workpiece. Then the strain and strain rate values are calculated for each point of the surface and subsurface layers using the determined stress field. Finally, Johnson-Cook material model is used to calculate flow stress and work hardening. Experimental results of the different machining conditions has been used to validating the proposed model, however comparisons of subsurface microhardness obtained by analytical model with experimental tests shown that the model properly predicts the amount of work hardening.

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