Abstract
Fatigue tests on a large number of double cover plate butt joints showed that the cause of failure in the majority of cases was by cracks originating in an annular area of fretting damage around the bolt hole. The nature of the fretting is discussed and the variation with load amplitude of the size of the annular area is described. Several well defined patterns of fatigue cracking were observed. These are described and their associated crack origins classified and related to the joint geometry and load levels.
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