Analysis of Heat Flow Around Bolted Joints and Variations of Axial Bolt Force

Fukuoka, Toshimichi; Nomura, Masataka; Shino, Keiichi

doi:10.1299/kikaia.74.399

Cited by 4 publications

(1 citation statement)

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“…Contact thermal resistance is an important characteristic of rough surfaces and has continually been the focus of research in the field of heat transfer [10]. Both the theoretical study [11] and the experimental testing [12] of the contact thermal resistance of the bolt connection structure confirmed the non-uniformity of the contact thermal resistance at the flange connection interface. The non-uniform contact thermal resistance of the connection interface has an important influence on the temperature distribution of the flange structure.…”

Section: Introductionmentioning

confidence: 91%

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

Chen

Chu

2022

Aerospace

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According to the discontinuous structural characteristics of a gas turbine, by considering the contact thermal resistance of the rough surface, a contact thermal resistance measurement experiment was conducted in this study. The main objectives of this work were to investigate the influence mechanism and change law of the contact thermal resistance characteristics on flange installation. Furthermore, this study conducted a theoretical analysis of contact thermal resistance and the calculation of a typical flange mounting edge based on actual operating conditions. The research results show that the contact thermal resistance of a typical flange mounting edge increases with an increase in flange clearance under different tightening torques, which is essentially proportional to the flange clearance. As the flange clearance increases, the unit contact thermal conductivity firstly decreases rapidly. Then, as the flange clearance reaches 0.4 mm, the decreasing rate of unit contact thermal conductivity tends to flatten. In addition, the contact thermal resistance of the typical flange mounting edge decreases with the increase in the tightening torque under different flange clearances. Furthermore, the contact area ratio is not related to the material, and the contact thermal resistance under actual working conditions can be calculated using the unit contact area.

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Section: Introductionmentioning

confidence: 91%

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

Chen

Chu

2022

Aerospace

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Evaluation of Thermal Contact Resistance at the Interface Composed of Dissimilar Materials

2010

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Measurement of thermal contact resistance at the interface composed of titanium and titanium alloy and its application to bolted joints

Fukuoka

Nomura

2017

Transactions of the JSME (In Japanese)

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Titanium and titanium alloys have a lot of excellent characteristics when used for the parts and components of machines and structures. As for bolted joints, however, they are used only for some limited cases because of the high cost. Their specific characteristics, e.g., low weight and high resistance to corrosion, are highly attractive from the engineering point of view. In this paper, thermal contact coefficients at the interface composed of titanium and titanium alloys are measured, and the empirical equations for evaluating the coefficients are derived in the same form proposed in the previous papers.Then, heating experiments of bolted joints, tightened by titanium bolts, are conducted to examine how the bolt preloads vary when subjected to thermal loads, and the bolt preload variations are compared to the case tightened by carbon steel bolts. In the next place, aiming at a broader use of titanium and titanium alloy bolts, numerical analyses are performed to demonstrate the effectiveness of those bolts by incorporating the foregoing thermal contact coefficients into the finite element formulation. The numerical results are favorably in good agreement with the experimental ones, and they suggest that threaded fasteners made of titanium alloys can be favorably applied to the joints whose clamping forces are likely to decrease when subjected to thermal loads.

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Analysis of Heat Flow Around Bolted Joints and Variations of Axial Bolt Force

Cited by 4 publications

References 0 publications

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

Evaluation of Thermal Contact Resistance at the Interface Composed of Dissimilar Materials

Measurement of thermal contact resistance at the interface composed of titanium and titanium alloy and its application to bolted joints

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