Author(s)

D.R Rooke

Abstract

Crack growth is usually dominated by the remote boundary loads on the cracked body. However when cracks are small, local loads can have a sub- stantial effect on the crack growth behaviour. These local loads often arise due to fretting, that is the rubbing together of surfaces. If frictional forces are present, then non-linear effects must be taken into account. In general fatigue crack growth is determined by AJf (the range of the stress inten- sity factor) and E (the ratio of minimum 7f to maximum #). This paper demonstrates, for a simple model, the effects on both A# and A caused by localized fretting forces. 1 Introduction It is well-established that fatigue crack growth is controlled by the stress Held in the vicinity of the crack tip; a Reid which is characterized by the stress intensity factor. It was shown by Paris[1] that the prime controlling parameter is the cyclic range of the str

Keywords