Curvature-dependence of Cut-off Frequencies of Guided Waves Propagating through Curved Structures Obtained by a Semi-Analytical Finite Element Method
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Non-destructive testing (NDT) and structural health monitoring (SHM) are engineering techniques for investigating defects without breaking structures. Guided wave ultrasonic modes propagating over long distances can be applied to NDT for long structures such as plates, rods and pipes. Guided waves have a dispersion property, which represents dependence of propagation velocities on frequencies. Therefore, for effective use of guided waves, we need to know this property, which is usually expressed as dispersion curves [1]~[3].
The goal of this paper is to numerically investigate effects of curvatures on the dispersion property of guided waves propagating in a helical structure and a curved plate by a semi-analytical finite element method (SAFE) [4]~[6]. A helical structure is regarded as cylinder with curvatures and torsions, and a curved plate is regarded as a flat plate with curvatures. Thus, the authors investigated how dispersion properties of fundamental modes change as the curvature increases.
Numerical results show that the cut-off frequency of some propagation modes increases as the curvature increases.