Under ultrasonic interval loading with air cooling, it all occurred at an internal inclusion in the whole stress amplitudelevel.
压缩空气冷却的间歇加载超声试样，在全应力幅范围均为夹杂物引起的内部破坏。
2
In some cases, the continuous distribution model of fatigue failure life and stress amplitudelevel is more valuable in analyzing the damage of ponogena under complicated stress.
One is called the S-N curve of surface fracture mode. It is governed by a crystal slip on the specimen surface, which occurs in the region of short fatigue life and high stress amplitudelevel.