Fastener Engineering

Written by Dr. Jody Muelaner Pressure adhesive, also known as pressure-sensitive adhesive (PSA) or self-adhesive, flows between the surfaces being bonded. If the surfaces are smooth enough to get close together, the viscosity of the thin film combined with molecular interactions, form a strong bond.  This is the type of adhesive used on self-adhesive tapes…

By Dr. Jody Muelaner A torsion spring is a component made from elastic material that, when twisted, exerts a moment resisting the rotation. Common types of torsion spring include helical torsion springs, torsion bars, and spiral wound torsion springs. Helical torsion springs are made from a material, typically sprung steel spring wire, and formed into…

The fatigue capacity of a bolted joint is very small, as compared to its static capacity. To improve fatigue resistance, designers can increase the thread capacity and decrease the alternating stresses at the threads. To increase the thread capacity, the Nord-Lock Group — a provider of secure and customized bolting solutions — recommends using a…

By Dr. Jody Muelaner Industrial seals are used to prevent leakage, hold pressure, and deflect contamination at interfaces between components. Industrial seals are used at static and dynamic interfaces. Examples of static interfaces include the entry point of bolts and screws, and the interface between an engine block and cylinder head. Adhesives and gaskets are…