| 摘要 |
There is provided a fatigue test method with which the crack growth can be checked for a plurality of cycle rates in a single test. At a first cycle rate f 1 of 0.01 Hz, hydrogen has a greater effect on crack growth than at a second cycle rate f 2 of 1 Hz. As a result, an area of large hydrogen effect (an area developed at the cycle rate f 1 ) and an area of small hydrogen effect (an area developed at the cycle rate f 2 ) appear alternately on the fatigue fracture surface, and since these two areas have different fracture surface morphologies, it is possible to see the boundary lines. Consequently, the lengths of the cracks developed under each set of conditions can be specified, and a fatigue crack growth curve can be acquired for each set of conditions.
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