Invariability,hesitation or restoration of damage in wet-dry fatigue process

The effects of corrosive wet conditions on the progress of fatigue were studied by means of wet-dry two-stage tests of same stress level. Some results from the two-state tests—invariability, hesitation, etc., during the progress of fatique fracture—are discussed on the basis of results of measurements made on corrosionfatigue cracks and anlaysis by the equations of crack propagation. Several new methods for measurement of corrosionfatigue cracks were developed for this purpose.