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- W2005179626 abstract "Elastic guided waves have some potential for non-destructive inspection of civil engineering multi-wire steel cables. However, wave propagation inside such structures is not yet fully understood. This paper investigates multi-wire helical waveguides with special attention to the common seven-wire strand configuration (one straight core surrounded by one layer of six helical wires). A helical coordinate system is first proposed. Though non-orthogonal, this system preserves translational invariance along the helix centreline to explicitly perform a spatial Fourier transform. Then, it is shown that for the analysis of multi-wire helical strands a twisting system—which is a special case of helical systems—is translationally invariant. A semi-analytical finite element method is developed reducing the problem on the cross-section only. A straightforward computation of energy velocity is proposed. Dispersion curves for a single straight wire and a helical wire are first computed to verify the adequacy of the twisting system. Finally the seven-wire strand is analysed using simplified contact conditions. Theoretical dispersion curves are compared to low-frequency magnetostrictive measurements. Good agreement is found for the first compressional-like mode and its associated veering central frequency (‘notch frequency’)." @default.
- W2005179626 created "2016-06-24" @default.
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- W2005179626 date "2010-05-01" @default.
- W2005179626 modified "2023-10-04" @default.
- W2005179626 title "Investigation of elastic modes propagating in multi-wire helical waveguides" @default.
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- W2005179626 doi "https://doi.org/10.1016/j.jsv.2009.11.021" @default.
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