Sensors for monitoring early stage fatigue cracking
作者： John M Papazian , Jerrell Nardiello , Robert P Silberstein , Greg Welsh , David Grundy
DOI: 10.1016/J.IJFATIGUE.2007.01.023
关键词: Calibration curve 、 Scanning electron microscope 、 Materials science 、 Composite material 、 Magnetometer 、 Ultrasonic sensor 、 Conductivity 、 Cracking 、 Eddy current 、 Electronic engineering 、 Aluminium
摘要: Three sensor systems were evaluated for their ability to detect early stage fatigue cracking in open holes. The (1) a Meandering Winding Magnetometer Array system that induces eddy currents monitor conductivity changes; (2) through-transmission ultrasonic technique monitors energy loss, and (3) the Electrochemical Fatigue Sensor which detects fatigue-induced changes metal surface through effects on electrochemical double layer. sensors mounted individually or tandem samples of 7075-T651 aluminum alloy then fatigued using spectrum loading sequence. also examined at various stages during cycling optical scanning electron microscopy. Detection thresholds approximately 100 μm observed, calibration curves crack size terms outputs obtained.
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