...Amro M. Zaki; Sayed A. Nassar; Xianjie Yang A nonlinear mathematical model is developed for studying the self-loosening behavior of preloaded countersunk threaded fasteners that are subjected to cyclic transverse loads. Torque components acting on the bolt are divided into pitch and resistance...

...Sayed A. Nassar; Amro M. Zaki This paper experimentally investigates the effect of coating thickness on the thread, bearing friction coefficients, and torque-tension relationship in threaded fasteners, as well as an investigation into the effect of coating thickness on surface roughness properties...

... 04 2008 12 08 2008 fasteners numerical analysis sliding friction wear lead screw thread wear load distribution Excessive wear and catastrophic failure of nut threads in lead screws ( 1 2 3 ) have prompted recent studies of load distributions on lead screw nut...

...S. A. Nassar; H. El-Khiamy; G. C. Barber; Q. Zou; T. S. Sun An experimental procedure is proposed for studying the underhead and thread friction in fasteners. The effective bearing friction radius, the underhead friction coefficient, and the thread friction coefficient are experimentally determined...

... will be very useful in enhancing the reliability and safety of bolted joints. Manuscript received February 25, 2004; revision received July 19, 2004. Review conducted by: M. Lovell. 25 February 2004 19 July 2004 07 02 2005 fasteners mechanical contact mechanics friction...