Abstract

In order to understand the fundamentals of threaded fasteners, the essential characteristics of strength and stiffness are discussed in detail. It is shown how the true profile of the cross-section of screw threads can be expressed by mathematical formulae, by which finite element models of bolted joints with perfect geometry are constructed to perform numerical analysis with high accuracy. In addition, a summary of the interface stiffness and thermal contact resistance, both of which are primarily due to the microprojections existing on contact surfaces, is given to conduct the finite element analyses by taking account of the conditions of contact surfaces existing in bolted joints.

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