MATHEMATICAL MODELLING OF TECHNOLOGICAL PROCESSES AND SYSTEMS

A INVERSE PROBLEM IN ULTRASONIC TESTING AND MECHANICAL PROPERTIES OF POLYCRYSTALLINE MATERIALS

  • 1 Institute of Mechanics, BAS, Sofia, Bulgaria
  • 2 Institute of Metal Science, BAS, Sofia, Bulgaria

Abstract

The direct problem in ultrasonic testing (UT) is: “Evaluation of attenuation coefficient by means velocity of ultrasonic wave propagation, frequency and grain size in polycrystalline materials”. The inverse problem in UT is formulate as “Non-destructive evaluation of grain size by measurement of acoustical characteristics”. The values of acoustical characteristics (V V f ) L T L ; ;α ; are measured, according ASTM E 494:2015. In this article a equation for grain size (D) is derived.

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