... is used. Keywords: tightening strategy, angle control, tightening specification, threaded fasteners, bolted joints, tightening beyond yield. 1. INTRODUCTION Threaded fasteners are commonly used to form mechanical connections in many industries, from automotive to structural steel, primarily because...

... specifications for joints that use self tapping and thread rolling screws. Additionally, it provides a criterion to determine whether the joint design is robust enough for assembly or not. threaded fasteners self tapping screws thread rolling screws thermoplastic screws tightening torque 1...

... mean stress level commonly referred to as a Modified Goodman diagram for bolted joints. The plotted fatigue strength data was not linear but displayed a knee or a bend. This knee or bend represents a transition point in the fatigue behavior of the threaded fastener. To describe the fatigue behavior...

... 14 01 2011 In the paper, a novel criterion is developed for preventing the self-loosening of preloaded threaded fasteners under cyclic transverse loading. For a known cyclic excitation, the system parameters are used in the formulation of a closed form solution for the minimum fastener...

...). Analysis of the test data showed that a non-conforming thread root radius had an adverse effect on the fatigue performance of preloaded threaded fasteners. Threaded fasteners root radius non-conformance mean stress stress amplitude cyclic load Proceedings of PVP2008 2008 ASME Pressure Vessels...

... tension to its yield strength. Analytical results are presented for a range of stiffness ratios that simulates both soft and hard joint applications. Threaded fasteners clamp load yield tightening flanged joints pressure boundaries fastener fatigue fastening and joining PVP-Vol. 478...

... the average value of the minor and major thread radii. It is well known that the torque-tension relationship in threaded fastener applications is highly sensitive to the friction torque components: between threads, and under the turning fastener head or nut. Even moderate variations or inaccuracies...

... 04 08 2008 A mathematical model and an experimental procedure are presented for studying the self-loosening phenomenon of threaded fasteners that are subjected to cyclic transverse loads. The effect of thread and underhead friction coefficients, the hole clearance, and the frequency...

... 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...

... 21 07 2008 New formulas are developed for the torque-tension relationship, various torque components, and for the break-away torque values in threaded fastener applications. The 3-D aspects of the lead helix and thread profile angles, the kinetic and static friction coefficients...