A simple approach to estimate the size of small surface cracks with the use of acoustic surface waves
- 1 July 1978
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 33 (1) , 6-8
- https://doi.org/10.1063/1.90148
Abstract
The scattered radiation patterns of surface cracks irradiated by acoustic surface waves are interpreted to provide estimates of crack size. The technique is demonstrated for cracks as small as 100 μm in radius with an accuracy of about 10%.The key features are the positions and spacings of nulls in the angular dependence of the backward scattered surface‐wave intensity. A simple model based on optical diffraction theory is presented and demonstrated on cracks (made with the identation technique) in commercial hot‐pressed silicon nitride studied at 100 MHz and on cracklike flaws in commercial aluminum studied at 2–10 MHz.Keywords
This publication has 3 references indexed in Scilit:
- Effect of Grinding on Flaw Geometry and Fracture of GlassJournal of the American Ceramic Society, 1977
- The Possibility of Assigning a Signature to Rough Surfaces Using Ultrasonic Backscattering DiagramsIEEE Transactions on Sonics and Ultrasonics, 1976
- Mixed‐Mode Fracture from Controlled Surface Flaws in Hot‐Pressed Si3N4Journal of the American Ceramic Society, 1976