On the following pages you find some informations about my PhD thesis
which I finished in October 2002 under
the guidance of Prof.
Dr. J. Dual (examiner) and Prof.
Dr. W. Sachse (co-examiner).
Use the
navigation on the left to get to a summarized HTML-version of each chapter.
Pdf-file of my complete thesis: Detection.pdf
(1'132 KB)
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The aim of my thesis is the development of a long-range non-destructive
testing method for cylindrical structures using guided elastic waves (see Chapter
1). The goal is not only to detect the defects but also to determine their axial and circumferential position and
orientation.
Therefore, the
scattered field which is generated by the interaction of the excited structural
waves with the defect, is measured as a function of time and analyzed using a a time reverse
numerical simulation (TRNS).
For the simulation, a three-dimensional code to describe the phenomena of
wave propagation in hollow cylinders is necessary. The finite-difference method
(FDM) applied in the
present thesis is described in Chapter 2 and the principle of the time
reverse method is discussed in Chapter
3. The experimental
results for different notches, the evaluation procedure, and the testing setup
are presented in Chapter 4.
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T.
Leutenegger, J. Dual
Detection of defects in cylindrical structures using a
time reverse method and a finite-difference approach
Ultrasonics, Vol. 40, 721-725 (2002)
Abstract: English
T.
Leutenegger, D.H. Schlums, J. Dual
Structural Testing of Fatigued Structures
Proceedings of Smart Structures and Materials, Newport Beach
CA, March 1999, pp. 987-997
Abstract: English
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Current
semester and diploma projects
for our students
The Institute
of Mechanical Systems and the Center of
Mechanics
The Department
of Mechanical Engineering at the Swiss Federal
Institute of Technology
Pistensau-of-the-year-award
My
favourite graphic designer GYSIN [Konzept+Gestaltung]
