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

机译:发动机盘中裂缝的Sonic IR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:我们在F-110风扇盘中描述了最近的Sonic红外(IR)裂纹检测的实验。该技术使用单个短脉冲声音来引起裂缝加热并在红外变得可见。低频(15至40 kHz)超声换能器用声音填充样品,使裂缝接口处导致摩擦加热。我们表明该技术可以应用于相当大的和不规则形状的物体,如飞机发动机盘,而不会令人振奋的声模式模式,这可能隐藏在节点区域中的裂缝。

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