Review and statistical analysis of the use of ultrasonic velocity for estimating the porosity fraction in polycrystalline materialsA review and statistical analysis of the ultrasonic velocity method for estimating the porosity fraction in polycrystalline materials is presented. Initially, a semiempirical model is developed showing the origin of the linear relationship between ultrasonic velocity and porosity fraction. Then, from a compilation of data produced by many researchers, scatter plots of velocity versus percent porosity data are shown for Al2O3, MgO, porcelain-based ceramics, PZT, SiC, Si3N4, steel, tungsten, UO2,(U0.30Pu0.70)C, and YBa2Cu3O(7-x). Linear regression analysis produces predicted slope, intercept, correlation coefficient, level of significance, and confidence interval statistics for the data. Velocity values predicted from regression analysis of fully-dense materials are in good agreement with those calculated from elastic properties.
Document ID
19920046098
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Roth, D. J. (NASA Lewis Research Center Cleveland, OH, United States)
Swickard, S. M. (NASA Lewis Research Center Cleveland, OH, United States)
Stang, D. B. (NASA Lewis Research Center; Sverdrup Technology, Inc. Cleveland, OH, United States)
Deguire, M. R. (Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Quality Assurance And Reliability
Meeting Information
Meeting: Annual Review of Progress in Quantitative Nondestructive Evaluation