It was found that crack opening stress intensities are not constant after holding for various times in the unloaded state for iron and a sequence of Fe‐Si binary alloys. The crack opening level decreased with time first because of asperity creep and substructure relaxation, and then increased again with time due to reverse plastic zone relaxation allowing a new set of asperities to come into contact. It is demonstrated that the crack closure phenomenon is not only a result of residual plasticity, oxidation and asperities, but also is due to asperity creep and reverse plastic zone relaxation at the crack tip for low strength materials.
|Original language||English (US)|
|Number of pages||11|
|Journal||Fatigue & Fracture of Engineering Materials & Structures|
|State||Published - Jan 1985|