This paper outlines the mechanism of Stress Corrosion Cracking (SCC) and how it can cause premature failure of rock
bolts. SCC occurs due to the progressive development and growth of cracks in the surface of a metal, and it is caused by
the combined effects of stress and a corrosive environment affecting susceptible metals and alloys. It can occur in most
metals including stainless steel. It is not a new phenomenon, but its effect on rock bolts has only been recognised recently.
Rock bolt failures caused by SCC appear to be brittle failures which occur at less than the ultimate tensile strength of the
bolt. In the mining industry, SCC failures of rock bolts can occur a few months, or after many years of exposure to stress
and a corrosive environment. If SCC of rock bolts is suspected, then the rock bolts should be examined by a metallurgist,
and steps should be taken to reduce the problem.