FATIGUE TESTING METHOD IN HYDROGEN GAS

摘要

Provided is a fatigue testing method capable of confirming crack progressing situations on a plurality of repetition rates by a single test. In the case of a repetition rate of f1 = 0.01 Hz of Condition 1, the influences for hydrogen to exert on a fatigue progress are more serious than the case of a repetition rate of f2 = 1 Hz of Condition 2. As a result, the area of the more serious influences of hydrogen (i.e., the area developed at the repetition rate of f1) and the area of the less serious influences of hydrogen (i.e., the area developed at the repetition rate of f2) appear alternately on the fatigue fracture, and a boundary line can be visually confirmed, because the two areas have different fracture modalities. Thus, the crack lengths having progressed under the individual conditions can be individually specified so that the fatigue crack progressing curves on the individual conditions can be acquired.