An investigation of the influence of grain size on stress wave attenuation and dispersion in rock like materials
"A mathematical model which is independent of any specific physical mechanism and based on two port linear network theory is developed to describe attenuation and dispersion in a medium. The assumption is made that the ll medium behaves in a linear manner. The influence of grain size on attenuation and dispersion is investigated and the effect of aggregate to matrix ratio also is considered. Theoretical equations adopted from related research are utilized to predict the dispersion curve from calculated attenuation parameters. Results show that the linear assumption made for the medium is valid for the specimens tested. The attenuation parameters increased with an increase in grain size. The predicted dispersion data obtained utilizing the calculated attenuation parameters show good correlation with the corresponding values determined experimentally. With a known pulse from a given location, the change in the pulse shape along the bar at different stations is predicted utilizing the known calculated attenuation parameters and predicted dispersion data. Predicted and experimentally obtained strain-time curves at different stations along the bar show good correlation"--Abstract, page ii.
Missouri University of Science and Technology
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