Ultrasonic Attenuation in Polycrystalline Materials in 2D

Ultrasonic attenuation and backscattering in polycrystalline materials with nonspherical grains

An ultrasonic wave propagating through a microscopically inhomogeneous medium, such as polycrystalline materials, is subject to scattering at the grain boundaries as well as other inhomogenities. The fraction of energy removed from the incident wave is responsible for important phenomenon like attenuation, dispersion, and background “noise" associated with a given ultrasonic inspection system. ...

Ultrasonic Attenuation in Polycrystalline 5n Aluminium

Stress-dependent ultrasonic scattering in polycrystalline materials.

Stress-dependent elastic moduli of polycrystalline materials are used in a statistically based model for the scattering of ultrasonic waves from randomly oriented grains that are members of a stressed polycrystal. The stress is assumed to be homogeneous and can be either residual or generated from external loads. The stress-dependent elastic properties are incorporated into the definition of th...

Characterization of Cement-Based Multiphase Materials Using Ultrasonic Wave Attenuation

To my family and friends who make me who I am ACKNOWLEDGEMENTS This work would not have been possible without the support from a number of people who encouraged me during my stay in the United States. Most importantly, I would like to thank Prof. Laurence 'Larry' Jacobs for being an outstanding advisor, teacher, and friend, supporting me in an unprecedented way during my stay at Georgia Tech. F...

Ultrasonic Attenuation in Solid Helium

A great deal of information about the motion of dislocations in solid helium has been obtained from ultrasonic and interna1 friction measurements. A brief review is given and representative data for 3 ~ e are presented, showing dislocation resonance and damping as well as pinning effects.