Abstract
An effective way to evaluate changes in the microstructure of a material or to assess fatigue damage at an early stage in fatigue life is by measuring the acoustic nonlinearity parameter β. Beta is defined originally for plane harmonic longitudinal waves and depends on the ratio of the amplitudes of the first and second harmonics in the measured signal. This paper extends the concept of the conventional nonlinear parameter to the case of nonlinear Rayleigh surface waves. Surface waves are more efficient in detecting fatigue damage that is usually initiated and more concentrated near the material surface. Based on using an approximate model for nonlinear wave propagation, a nonlinearity parameter βR for Rayleigh surface waves is proposed. Comparisons and discussions are made on the use of the nonlinearity parameter βR for Rayleigh surface waves.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
