Accession Number : AD1040192


Title :   A Numerical Method for Predicting Rayleigh Surface Wave Velocity in Anisotropic Crystals (Postprint)


Descriptive Note : Journal Article - Open Access


Corporate Author : AFRL Materials and Manufacturing Directorate Wright Patterson Air Force Base United States


Personal Author(s) : Cherry,Matthew R ; Sathish,Shamachary


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1040192.pdf


Report Date : 05 Sep 2017


Pagination or Media Count : 16


Abstract : A numerical method was developed for calculating the Rayleigh Surface Wave (RSW) velocity in arbitrarily oriented single crystals in 360 degrees of propagation. This method relies on the results from modern analysis of RSW behavior with the Stroh formalism to restrict the domain in which to search for velocities by rst calculating the limiting velocity. This extension of existing numerical methods also leads to a natural way of determining both the existence of the RSW as well as the possibility of encountering a pseudo-surface wave. Furthermore, the algorithm is applied to the calculation of elastic properties from measurement of the surface wave velocity in multiple different directions on a single crystal sample. The algorithm was tested with crystal symmetries and single crystal elastic moduli from literature. It was found to be very robust and ecient in calculating RSW velocity curves in all cases.


Descriptors :   rayleigh waves , crystal structure , velocity , elastic properties


Subject Categories : Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE