Application of the dynamic models to the detection of imperfections in plate Structures

Samartín, Avelino and Moreno González, Carlos (2002). Application of the dynamic models to the detection of imperfections in plate Structures. In: "Sixth International Conference on Computational Structures Technology", 4-6 de Septiembre, 2002, Praga (República Checa). ISBN 0-948749-83-0. pp. 127-138.

Description

Title: Application of the dynamic models to the detection of imperfections in plate Structures
Author/s:
  • Samartín, Avelino
  • Moreno González, Carlos
Item Type: Presentation at Congress or Conference (Article)
Event Title: Sixth International Conference on Computational Structures Technology
Event Dates: 4-6 de Septiembre, 2002
Event Location: Praga (República Checa)
Title of Book: Proceedings of the Sixth International Conference on Computational Structures Technology
Date: 2002
ISBN: 0-948749-83-0
Subjects:
Freetext Keywords: plate structures, imperfections detection, dynamics, Rayleigh waves
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Mecánica de Medios Continuos y Teoría de Estructuras
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper is part of a set of publications related with the development of mathematical models aimed to simulate the dynamic input and output of experimental nondestructive tests in order to detect structural imperfections. The structures to be considered are composed by steel plates of thin thickness. The imperfections in these cases are cracks and they can penetrate either a significant part of the plate thickness or be micro cracks or superficial imperfections. The first class of cracks is related with structural safety and the second one is more connected to the structural protection to the environment, particularly if protective paintings can be deteriorated. Two mathematical groups of models have been developed. The first group tries to locate the position and extension of the imperfection of the first class of imperfections, i.e. cracks and it is the object of the present paper. Bending Kirchoff thin plate models belong to this first group and they are used to this respect. The another group of models is dealt with membrane structures under the superficial Rayleigh waves excitation. With this group of models the micro cracks detection is intended. In the application of the first group of models to the detection of cracks, it has been observed that the differences between the natural frequencies of the non cracked and the cracked structures are very small. However, geometry and crack position can be identified quite accurately if this comparison is carried out between first derivatives (mode rotations) of the natural modes are used instead. Finally, in relation with the analysis of the superficial crack existence the use of Rayleigh waves is very promising. The geometry and the penetration of the micro crack can be detected very accurately. The mathematical and numerical treatment of the generation of these Rayleigh waves present and a numerical application has been shown.

More information

Item ID: 41658
DC Identifier: http://oa.upm.es/41658/
OAI Identifier: oai:oa.upm.es:41658
Deposited by: Biblioteca ETSI Caminos
Deposited on: 23 Jun 2016 05:32
Last Modified: 23 Jun 2016 05:32
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