Ultrasonic Guided Wave Propagation in Hollow Cylinders with Axial Periodicity

Open Access
Author:
Malinowski, Owen Michael
Graduate Program:
Engineering Mechanics
Degree:
Master of Science
Document Type:
Master Thesis
Date of Defense:
March 21, 2014
Committee Members:
  • Joseph Lawrence Rose, Thesis Advisor
  • Ivica Smid, Thesis Advisor
  • Bernhard R Tittmann, Thesis Advisor
Keywords:
  • Ultrasonic
  • Guided Waves
  • Elastic Waves
  • Periodic Media
Abstract:
Ultrasonic guided waves are finding increasingly utility in the field of nondestructive testing (NDT); most notably, in the qualitative screening of buried pipeline. However, only a fraction of their potential applications in NDT have been fully realized. This is due, in part, to their complex nature, as well as the high level of expertise required to understand and utilize their propagation characteristics. The mode/frequency combinations that can be generated in a particular structure depend on the geometry and material properties and are represented by the so-called dispersion curves. Although extensive research has been done in ultrasonic guided wave propagation in various geometries and materials, the treatment of ultrasonic guided wave propagation in periodic structures has received little attention. In this thesis, academic aspects of ultrasonic guided wave propagation in structures with periodicity in the wave vector direction are investigated in conjunction with the practical purpose of developing an ultrasonic guided wave based inspection technique for finned heat exchanged tubing. Theoretical, numerical, and experimental methods are employed.