关键词: 疲劳, 狗骨形试样, 超声疲劳, 谐振长度, 应力放大系数

Abstract: The design and calculation method of specimen for ultrasonic fatigue is recommend. The distributions of the displacement and stress along the resonance length in the testing specimen with different size and shape are given out. It shows that the dimension of gage (the central portion with equal section)is critical for the stress distribution in the dog-bone-shaped specimen. Analysis for the stress magnification of dog-bone-shaped specimen shows that the stress magnification coefficient increases...

Key words: fatigue, dog-bone-shaped specimen, ultrasonic fatigue, resonance length, stress magnification coefficient