https://cronfa.swan.ac.uk/Record/cronfa31564/Download/0031564-04012017122239.pdf

Microstructural mechanisms and advanced characterization of long and small fatigue crack growth in cast A356-T61 aluminum alloys

Numerical calculations have been carried out for about 20 years, and the results are demonstrated graphically by vector or lattice representations. These results are now being used mainly for clarifying the mechanisms of ultrasonic interaction with material and defects and checking and improving the experimental results. Parts of this paper review results, many involving cracktip diffraction in various geometries, which have been published mainly in conference proceedings and have not appeared in journals. Other parts, dealing with focused fields, focal lenses, and radiation in an anisotropic medium are new, and have not appeared even as conference papers.

Computer simulation of ultrasonics and its applications

Mode-I crack projection procedure using the strain energy density criterion

SUMMARY The ultrasonic energy diffracted from the tips of cracks has been used in the sizing and evaluation of defects for some 20 years. Industrial application is now possible by means of the time of flight diffraction (TOFD) technique developed by one of us (MS) at Harwell and the focussing, echodynamic time-of-flight (FET) technique developed by the other authors at the Ecole Centrale. We have recently jointly reviewed progress in this field1 and this paper presents some of the important developments and outstanding problems highlighted by the review.

Applications of the diffraction of ultrasound by crack tips

In order to make more accoste the ultrasonic methods of sizing of defects based on tip wave diffraction and
recording of echodynamic, a study was performed wich permets to characterize this echodynamic and to point ou
the parametres wich influence it .

15 - Facteurs influençant l'échodynamique d'un défaut obtenue par traducteur ultrasonore focalisé

2.2.2.2. The diffracted field 6 2.3. Elastodynamic Waves 6 2.3.

M.G. Silk

Papers

Review of Knowledge About Diffraction of US by Crack Tips

Applications of the diffraction of ultrasound by crack tips