Threaded fasteners: careful design bolts and studs
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CAREFUL DESIGN OF BOLTING SYSTEMS IS NECESSARY TO ENSURE PROPER PERFORMANCE
Data for bolts and other threaded fasteners that fulfil many different functions in engineering are examined. The behaviour of bolted joints during assembly or in service can be quite complex and careful design of bolting systems is necessary to ensure proper performance. Bolted joints are used commonly to clamp components together or to react or transmit forces. They are also used to locate components in a particular position while allowing free sliding movement. In all cases it is important that connections do not loosen during the service life of the bolted artefact.
Data relating to the strength analysis of components used in general mechanical engineering has been well established and contains a wealth of information and which has been evaluated by engineers to ensure soundly based analysis leading to safe, cost?effective design. The validation and accuracy of the data is applicable to the usual metals used in engineering and to any other isotropic materials.
New Data relating to threaded fasteners such as bolts and studs, and also to the members in the bolted joints, has been recently issued….below are examples of these
- ESDU 13008 (was ESDU 85004), “Fatigue strength of low-carbon steel stud threads under axial and combined axial and bending loading.”
- ESDU 13015, “An introduction to some methods to calculate loads and stiffnesses in bolted assemblies.”
- ESDU 13016, “Some factors affecting the design of bolted assemblies.”
- ESDU 14001 (was ESDU 86014), “Applying, measuring and maintaining pretension in steel bolts.”
- ESDU TM 175, “Self-loosening of bolted joints.”
- ESDU 14002 (was ESDU 87023), “Lock nuts and other thread locking devices.”
- ESDU 14003, “Guide to bolted joints and screw threads data.”