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The Influence of Metal Grain Structure on the Attenuation of an Ultrasonic Acoustic Wave


Roney, Robert Kenneth (1950) The Influence of Metal Grain Structure on the Attenuation of an Ultrasonic Acoustic Wave. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/V3FK-SM37.


Apparatus is described for the study of the propagation of ultrasonic acoustic waves in solid bodies and its applications in metallurgy. In particular, the anisotropy of attenuation in cold worked aluminum and the effect of anneal are demonstrated. Reflections from individual crystal faces are identifiable in bodies with average grain diameter of 0.17 mm. A critical discussion is given of a theoretical effect of grain size on wave attenuation as advanced by Mason and McSkimin(9), and an empirical relation reported by Roth(7). The theory is extended to cover the complete range from that explored by Mason to that reported by Roth. Experimental deviation from the theoretical effect indicates other factors besides average grain size are effective in materials with asymmetrical grain structure.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Electrical Engineering and Physics)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Electrical Engineering
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Lindvall, Frederick C.
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1950
Record Number:CaltechETD:etd-01052007-131306
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37
Deposited By: Imported from ETD-db
Deposited On:05 Jan 2007
Last Modified:10 Apr 2023 22:01

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PDF (Roney_rk_1950.pdf) - Final Version
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