Surface-breaking fatigue crack detection using laser ultrasound
- 24 May 1993
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 62 (21) , 2649-2651
- https://doi.org/10.1063/1.109274
Abstract
Surface‐breaking tight fatigue cracks in mild steel have been examined with laser‐generated ultrasonic pulses. Before the arrival of transmitted Rayleigh waves arriving at the detector, evidence is presented of a fast skimming longitudinal pulse which is also transmitted through the crack. Additionally, another ultrasonic feature is consistent with a longitudinal wave which is mode converted to a diffracted shear pulse by the tip of the fatigue crack. Such an interaction mechanism can form the basis of laser‐based fatigue crack depth measurements.Keywords
This publication has 7 references indexed in Scilit:
- A non-contact scanning system for laser ultrasonic defect imagingMeasurement Science and Technology, 1991
- Diffraction of ultrasound by cracks: comparison of experiment with theoryUltrasonics, 1991
- Further evidence for two-component surface acoustic wave reflections from surface breaking slotsApplied Physics Letters, 1986
- Characterization of surface-breaking defects in metals with the use of laser-generated ultrasoundPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1986
- A pulsed photoacoustic investigation of ultrasonic mode conversionCanadian Journal of Physics, 1986
- Surface Acoustic Wave Interactions with Cracks and Slots: A Noncontacting Study Using LasersIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 1986
- Diffraction of elastic waves by cracks: application to time-of-flight inspectionUltrasonics, 1983