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Please use this identifier to cite or link to this item: http://hdl.handle.net/1993/97

Title: Interpreting wave propagation in a homogeneous, isotropic, steel cylinder
Authors: Stoyko, Darryl Keith
Supervisor: Popplewell, Neil (Mechanical and Manufacturing)
Examining Committee: Shah, Arvind (Civil Engineering) Balakrishnan, Subramaniam (Mechanical and Manufacturing Engineering)
Graduation Date: February 2005
Keywords: Green’s functions
Ultrasonic
Wave propagation
Semi-Analytical Finite Element
Cylinder
Pipe
Issue Date: 12-Jan-2005
Abstract: The majority of commercially available ultrasonic transducers used to excite and measure wave propagation in structures can be coupled only to a free surface. While convenient, this method is likely to excite multiple structural modes, making data interpretation difficult. Furthermore, the many modes excited make predicting the structure’s response a computationally intensive task. Here the dynamic radial displacement induced by a transient radial point load is calculated at more than 230,000 points on the outer surface of a virgin steel pipe to simulate a typical experiment. The radial component of the displacement field is calculated by convolving the Green’s functions of the pipe with the transient load. These functions are calculated on personal computers (in a distributed arrangement) by employing modal summation. The mode shapes are obtained from a Semi-Analytical Finite Element formulation used in conjunction with a separation of variables. The results are presented in a four dimensional animation, providing easier interpretations and insight into how to best select observation points for the detection of defects. The accuracy of the calculated displacements is verified experimentally. Agreement is good when magnitude and phase corrections are incorporated from the frequency response curves of the transducers used.
URI: http://hdl.handle.net/1993/97
Type: Electronic Thesis or Dissertation
Appears in Collection(s):FGS - Electronic Theses & Dissertations (Public)

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