This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Torque Angle Signature Analysis of Joints with Thread Rolling Screws and Unthreaded Weld Nuts
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 16, 2007 by SAE International in United States
Annotation ability available
Bolted joint separation occurs when components of a joint are no longer capable of maintaining a clamp load. The clamp load of a joint is the resultant of various factors such as the strength of joining components, geometry, and the surface condition of the joined parts. The fastener installation torque is a very critical parameter that contributes towards achieving the desired clamping force at the joint during the assembly process.
Thread rolling screws are increasingly being used in many automotive structural applications. The thread rolling screws are easy to install, are self aligning, and offer a torque prevailing feature with improved vibration resistance when mated with a un-threaded nut. This combination results in a robust joint and low field costs.
They also offer increased joint strength by work hardening the mating nut interface. This paper will describe the methodology of selecting the proper installation torque of bolted joints comprised of thread rolling screws and un-threaded weld nuts using torque to failure testing and torque angle signature analysis. The Torque-angle test is a very cost-effective method to determine the right installation torque of the bolted joints, thereby reducing the potential for joint failure.
The paper will also present a method to estimate the joint tension derived from the torque angle curve of the bolted joint.
|Technical Paper||Investigation of the Effect of Adhesive Coating on the Performance of Threaded Fasteners|
|Ground Vehicle Standard||Torque-Tension Tightening for Inch Series Fasteners|
|Aerospace Standard||Faster Torque for Threaded Applications, Definitions Of|
CitationVangipuram, R., Valasin, A., and Squires, R., "Torque Angle Signature Analysis of Joints with Thread Rolling Screws and Unthreaded Weld Nuts," SAE Technical Paper 2007-01-1665, 2007, https://doi.org/10.4271/2007-01-1665.
- Machinery's Handbook Industrial Press Inc. New York
- Edwards Kenneth S. Jr McKee Robert B. “Fundamentals of Mechanical Component Design” McGraw Hill Inc.
- Beitz W. Kuttner K.H. “Handbook of Mechanical Engineering” Springer-Verlag
- REMINC “TAPTITE 2000 ® Thread Rolling Fasteners”, Product Catalog
- Bickford J. H. “An Introduction to the Design and Analysis of Bolted Joints” 1997 third Marcel Dekker, New York, New York
- Motosh N “Development of Design Charts for Bolts Preloaded up to the Plastic Range” 1976 ASME Journal of Engineering for Industry 849 851
- Bickford J. H. Nassar A.S. “Handbook of Bolts and Bolted Joints” 1998 Marcel Dekker, New York, New York
- Shoberg Ralph S. “Tightening of Bolted Joints” Proceedings of the Seminar on Fastening Technology March 27-28 1996 R.S. Technologies Ltd
- Ford Fastener and Joint Design Handbook, Version 1.0, Ford Motor Company 2004
- Nassar S. A Sun T.S. Zou Q. “The Effect of Coating and Tightening Speed on the Torque-Tension Relationship in Threaded Fasteners” SAE Paper 2006-01-1252 Michigan April 2006