Finite element evaluation of the effects of curvature in lamb waves for composites structural health monitoring

Guilherme André Santana*, Mohammad Malekan, Alexandre Martins Araújo, Lázaro Valentim Donadon, Carlos Alberto Cimini

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Abstract

This work presents the effect of the high curvature to thickness ratio on the characteristics of Lamb Waves propagating over the skins of composite structures. It is accessed how the curvature on composite skins affects the group velocity of the symmetrical (S0) and asymmetrical (A0) wave modes. It is also accessed the gradient of curvature effect, when the wave propagates from a flat to a curved part on the skin. The results are intended to be used for the improvement of structural health monitoring of wings and wind turbine blades. This is accomplished through dynamic explicit linear finite element method simulations of plates with flat and curved parts made of Eglass-epoxy bidirectional laminate. As the skin structures are often designed to withstand torsional loads, the fibers are aligned with 45 degrees from the leading edge (curved region) throughout the analysis. Several skins with different curvature to thickness ratios are generated and simulated. Results and trends are presented and can be used to improve the algorithms for damage detection on those structures. It is shown that the group velocity of the incoming waves change considerably with the presence of curvature, for both main modes of vibration.

OriginalsprogEngelsk
Artikelnummere127
TidsskriftLatin American Journal of Solids and Structures
Vol/bind15
Udgave nummer10
Antal sider21
ISSN1679-7817
DOI
StatusUdgivet - 5. okt. 2018
Udgivet eksterntJa

Bibliografisk note

Publisher Copyright:
© 2018, Brazilian Association of Computational Mechanics. All rights reserved.

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