Influence of fatigue on casing strength
Casing failure can have various causes. Casing may fail after exceeding, even once, the ultimate tensile or compressive strength, but also after repeated load cycles below the ultimate tensile or compressive strength. This phenomenon is known as fatigue, and practically all materials are subject to it.
1 Introduction
The effects of surface condition, corrosion, temperature, etc., on fatigue properties are well documented. The microscopic mechanism of fatigue damage has been identified as cyclic plastic deformation of the material at the source of a fatigue crack (crack initiation) or at the tip . . .