Bearing Friction Torque in Bolted Joints

Bearing Friction Torque in Bolted Joints

Formulas are developed for calculation of the effective radius of the bearing friction forces on the rotating contact surface in threaded fasteners. These formulas provide a more accurate estimation of the underhead bearing friction torque component in threaded fastener applications. This enhances t...

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Bibliographic Details
Published in:Tribology transactions Vol. 48; no. 1; pp. 69 - 75
Main Authors: Nassar, Sayed A., Barber, G. C., Zuo, Dajun
Format: Journal Article
Language:English
Published: Colchester Taylor & Francis Group 01-01-2005
Taylor & Francis
Taylor & Francis Inc
Subjects:
Analysis
Applied sciences
Bearing Friction
Bearing Radius
Bearings
Bolted Joints
Exact sciences and technology
Fastener Underhead Pressure
Friction
Friction, wear, lubrication
Machine components
Mechanical engineering. Machine design
Pitch Torque
Pressure
Thread Friction
Threaded Fasteners
Torque
Torque-Tension Relationship
Tribology
Underhead Friction
Underhead Friction Torque
Underhead Friction
Torque
Mechanical torque
Machining
Bearing(mechanics)
Turning
Fastener
Thread Friction
Modeling
Pitch Torque
Contact stress
Bearing Friction
Friction coefficient
Penetration rate
Contact pressure
Fastener Underhead Pressure
Bolted joint
Torque- Tension Relationship
Bearing Radius
Pressure distribution
Threaded Fasteners
Contact surface
Joint clamping
Underhead Friction Torque
Bolted Joints
Reliability
Tribology
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Description
Summary:Formulas are developed for calculation of the effective radius of the bearing friction forces on the rotating contact surface in threaded fasteners. These formulas provide a more accurate estimation of the underhead bearing friction torque component in threaded fastener applications. This enhances the reliability, safety, and quality of bolted assemblies, especially in critical applications. It is well known that the torque-tension correlation in threaded fasteners, and the resulting joint clamping force, is highly sensitive to friction torque components: under the turning head and between threads. This analysis focuses on the bearing friction torque component under the turning head of a threaded fastener. Furthermore, it analyzes the error contained in the current practice when an approximate value, equal to the mean contact surface radius, is used instead of the actual bearing radius. New formulas for the bearing friction radius are developed for a mathematical model of a bolted joint using four different scenarios of the contact pressure distribution under the rotating fastener head or nut. The effect of the radially varying sliding speed over the rotating contact surface is analyzed and compared with a constant-friction-coefficient scenario. Numerical results and error analysis are presented in terms of a single nondimensional variable, namely, the radii ratio between the outside and the inside bearing area.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1040-2004
1547-397X
DOI:10.1080/05698190590899967