Contacts under Partial Slip

Abstract

Two fundamental features are present in any fretting problem: first, the contact must be experiencing shear tractions and this normally means that a resultant tangential force is transmitted from one body to another. Secondly, there must be some degree of relative tangential displacement between the contacting surfaces so that slip takes place during cyclic variation of the applied load. In Chapter 2, two types of contact were analysed:

• (i) Those where only normal force was applied and no shear tractions arose.

• (ii) Those where the shear tractions were everywhere equal to the limiting frictional value (i.e. q(x, y) = f p(x,y)). In this type of contact it follows that the total shear force, Q, is also equal to the limiting frictional value (Q = fP) and therefore gross sliding takes place between the contacting bodies.