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Lug Nut Tightness Reliability: Application of Torque-Angle Signature Analysis for Installation / Auditing Studies
Technical Paper
2014-01-0070
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Reliable wheel attachment must start with proper tightening of the lug nuts in order to achieve the clamping force necessary to hold the vehicle's wheels securely for all operating conditions.
It is the purpose of this paper to provide a complete overview of the theory and practice of using torque-angle signature analysis methods to examine the installation and audits of wheel lug nuts. An accurate estimate of clamp load can be determined without actually measuring the clamp load.
The torque-angle signature analysis, known as “M-Alpha”, performed on tightening and loosening curves provides a powerful tool to understand the integrity of a bolted joint when clamp load data is not available. This analysis technique gives insight into the frictional effects, material properties, and geometric factors that can affect the clamp load attained during the installation process.
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Topic
Citation
Shoberg, R. and Drumheller, J., "Lug Nut Tightness Reliability: Application of Torque-Angle Signature Analysis for Installation / Auditing Studies," SAE Technical Paper 2014-01-0070, 2014, https://doi.org/10.4271/2014-01-0070.Also In
References
- Shoberg , R. Advanced Bolt Torque Audit Yields Bolt Tension Data Distributors Link Magazine Fall 2010
- Drumheller , J Fundamentals of Torque- Tension and Coefficient of Friction Testing Distributors Link Magazine Winter 2011
- Shoberg , R. Tightening Strategies for Bolted Joints Distributors Link Magazine Spring 2011
- DIN-946 Determination of coefficient of friction of bolt/nut assemblies under specified conditions October 1991
- VDI 2230 Systematic calculation of high duty bolted joints, Joints with one cylindrical bolt Beuth Verlag GmbH Feb. 2003
- ISO 16047 Fasteners-Torque/clamp force testing INTERNATIONAL STANDARD 2005 02 01
- Miller , Dave How Tight is Right?’ Machine Design Magazine August 21 2001