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8 April 2009 Stress detection with guided acoustic ultrasonic waves by non-linear elastic and geometric effects
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Abstract
The detection of stress in bolts based on acoustic bulk waves of longitudinal and transversal polarization is well introduced and respective detection schemes are commercially available. Whereas the time-of-flight of bulk waves observed for detection varies under stress due to non-linear elastic properties, 1- or 2-dimensionally guided waves can in addition and for suitable modes even be dominantly influenced by geometric effects. Even though geometric effects are well known and used for example to tune string instruments, little if any attention has so far been given to similar effects for Lamb waves and other guided modes. The basic effects including anomalous stress dependencies if compared to bulk waves are presented and discussed including a comparison to expectations based on analytical modeling. Novel detection schemes including developments suitable for in-flight detections of stress in structural components of aircrafts are demonstrated.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. S. Tarar, R. Meier, U. Amjad, and W. Grill "Stress detection with guided acoustic ultrasonic waves by non-linear elastic and geometric effects", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 729518 (8 April 2009); https://doi.org/10.1117/12.815501
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