| Texto completo | |
| Autor(es): |
Prado, Vander T.
[1]
;
Higuti, Ricardo T.
[1]
;
Kitano, Claudio
[1]
;
Martinez-Graullera, Oscar
[2]
;
Adamowski, Julio C.
[3]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Paulista UNESP, Fac Engn, Dept Elect Engn, Ilha Solteira, SP - Brazil
[2] CSIC, Ctr Acust Aplicada & Evaluac No Destruct, CAEND, Madrid - Spain
[3] Univ Sao Paulo, Dept Mechatron & Mech Syst Engn, Sao Paulo - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | NDT & E INTERNATIONAL; v. 59, p. 86-95, OCT 2013. |
| Citações Web of Science: | 25 |
| Resumo | |
Several Lamb wave modes can be coupled to a particular structure, depending on its geometry and transducer used to generate the guided waves. Each Lamb mode interacts in a particular form with different types of defects, like notches, delamination, surface defects, resulting in different information which can be used to improve damage detection and characterization. An image compounding technique that uses the information obtained from different propagation modes of Lamb waves for non-destructive testing of plate-like structures is proposed. A linear array consisting of 16 piezoelectric elements is attached to a 1 mm thickness aluminum plate, coupling the fundamental A0 and SO modes at the frequencies of 100 kHz and 360 kHz, respectively. For each mode two images are obtained from amplitude and phase information: one image using the Total Focusing Method (TFM) and one phase image obtained from the Sign Coherence Factor (SCF). Each TFM image is multiplied by the SCF image of the respective mode to improve contrast and reduce side and grating lobes effects. The high dispersive characteristic of the A0 mode is compensated for adequate defect detection. The information in the SCF images is used to select one of the TFM mode images, at each pixel, to obtain the compounded image. As a result, dead zone is reduced, resolution and contrast are improved, enhancing damage detection when compared to the use of only one mode. (C) 2013 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 13/00330-0 - Formação de imagens de estruturas tipo placa com array de transdutores de ultrassom utilizando ondas de Lamb |
| Beneficiário: | Vander Teixeira Prado |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto |
| Processo FAPESP: | 10/16400-0 - Ensaios não-destrutivos por ultrassom de estruturas tipo placa utilizando arrays de transdutores piezelétricos |
| Beneficiário: | Vander Teixeira Prado |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |
| Processo FAPESP: | 10/02240-0 - Técnicas de ensaios não-destrutivos de estruturas utilizando ondas acústicas guiadas |
| Beneficiário: | Ricardo Tokio Higuti |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |