This paper explores the propagation and scattering of spiral creeping waves around a fastener hole. Preliminary experimental data demonstrates the presence of spiral creeping waves in angled beam inspection and the benefit for detecting cracks of varying angular location. Analytical models are used to provide insight into the propagation and focusing of spiral creeping waves around cylindrical holes. Also, a hybrid numerical model is presented to study scattering of spiral creeping waves from cracks around fasteners. Benefits of the effort include a fundamental understanding of the ultrasonic scattering phenomena, aid in design of ultrasonic methods to minimize inspection time, and the capability to better locate and characterize flaws around fastener sites using ultrasonic NDE transducers and potentially in aircraft structures using in situ sensors. Future parametric experimental studies are planned to investigate sensitivity of spiral creeping waves to flaw location and size, hole condition, and transducer characteristics. Using the numerical model, simulated studies are planned to explore transducer design and the fastener hole interface condition.
Spiral creeping waves in ultrasonic angled-beam shear wave inspection of fastener holes in multilayer structures
Spiral-Kriechwellen bei der Ultraschallprüfung mit Winkelstrahl-Scherwellen an Befestigungslöchern in Mehrschichtstrukturen
2006
8 Seiten, 5 Bilder, 13 Quellen
Conference paper
Storage medium
English
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