...Sayed A. Nassar; Xianjie Yang New formulas are developed for the torque-tension relationship, various torque components, and breakaway torque values in threaded fastener applications. The three-dimensional aspects of the lead helix and thread profile angles and the kinetic and static friction...

... separating force will leave the fastener with a permanent set that will cause clamp load loss. In spite of the fact that the tightening torque of a threaded fastener may easily be achieved with precision, and in compliance with the applicable engineering practices and standards, the fastener torque...

... variations. Because the torque-tension relationship in threaded fasteners is highly sensitive to friction variations, the scatter in such relationship is often unacceptable, especially in critical applications. By contrast, the automatic control of the fastener elongation during the tightening process would...

...Sayed A. Nassar; Basil A. Housari A mathematical model and an experimental procedure are presented to study the self-loosening phenomenon of threaded fasteners that are subjected to cyclic transverse loads. The study investigates the effect of thread pitch, initial bolt tension, and the amplitude...