超声波疲劳试验机用于进行测定金属、合金材料及其构件在室温状态下的拉伸、压缩或拉压交变负荷的疲劳特性、疲劳寿命、预制裂纹及裂纹扩展试验。超声波疲劳试验是一种加速共振式的疲劳试验方法，可大大缩短试验的时间，是航空发动机叶片超长寿疲劳试验唯一可用方案。
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