Abstract
Premature crack closure has been considered an important factor affecting the applied driving force under cyclic load. Among several factors that induce crack closure, plasticity and oxidation or corrosion have been recognized as the most significant. An analytical estimation of both is made using dislocation theory. The analysis indicates that (a) plasticity originating from crack tip does not induce crack closure and (b) closure arising from asperity ridges due to oxides, corrosion products or surface roughness is small and insignificant unless crack is completely packed with asperities.
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