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SONIC IR IMAGING AND VIBRATION PATTERN STUDIES OF CRACKS IN AN ENGINE DISK

机译:发动机磁盘裂纹的声红外成像和振动模式研究

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We describe recent experiments in sonic infrared (IR) crack detection in an F-110 fan disk. This technique uses a single short pulse of sound to cause cracks to heat up and become visible in the infrared. A low frequency (15 to 40 kHz) ultrasonic transducer fills the sample with sound that causes frictional heating at crack interfaces. We show that the technique can be applied to quite large and irregularly shaped objects like an aircraft engine disk without exciting acoustic mode patterns which might hide cracks in nodal regions.
机译:我们描述了F-110风扇盘中的声波红外(IR)裂纹检测的最新实验。该技术使用单个短的声音脉冲来使裂纹变热并在红外线中变得可见。低频(15至40 kHz)超声换能器将声音填充到样品中,从而在裂纹界面处产生摩擦加热。我们表明,该技术可以应用于相当大且形状不规则的物体(例如飞机发动机盘),而不会产生可能隐藏节点区域裂缝的令人兴奋的声模模式。

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