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Non-Destructive Testing of Hollow Sphere Sandwich Plates Using Guided Waves

Hosseini, Seyed Mohammad Hossein and Willberg, Christian and Gabbert, Ulrich (2012) Non-Destructive Testing of Hollow Sphere Sandwich Plates Using Guided Waves. 4th Interantional Symposium on NDT in Aerospace, 13.-15. Nov. 2012, Augsburg, Germany.

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Abstract

Online damage detection in thin wall light weight structures with guided waves is one common way to develop structural health monitoring (SHM) systems. To understand the behavior of wave propagation typically homogeneous plates made of aluminum and composite reinforced plastics (CFRP) are studied. However, hollow sphere sandwich plates among the cellular materials, have a high potential for the design of light weight structures. Therefore, the potential of elastic guided waves for damage detection in these materials has also to be investigated. In this work the wave propagation in an hollow sphere sandwich plate is studied with 3D laser scanning vibrometry. Two guided wave modes are excited with an applied piezoceramic patch actuator. These modes are found traveling through the top and bottom plate, and interactions with discontinuities have been found. Utilizing a computer tomography (CT) the inner structural discontinuities are visualized and debondings between the core material and the cover plates are found. In the paper the experimental results are presented and it is shown that the measured wave field can be used to detect damages inside the structure of a sandwich plate.

Document Type:Conference or Workshop Item (Speech)
Title:Non-Destructive Testing of Hollow Sphere Sandwich Plates Using Guided Waves
Authors:
AuthorsInstitution or Email of Authors
Hosseini, Seyed Mohammad HosseinOtto-von-Guericke-Universität Magdeburg
Willberg, ChristianDLR-FA/SM
Gabbert, UlrichOtto-von-Guericke-Universität Magdeburg
Date:November 2012
Status:Published
Keywords:guided waves, SHM, 3D laser scanning vibrometry, sandwich material
Event Title:4th Interantional Symposium on NDT in Aerospace
Event Location:Augsburg, Germany
Event Type:international Conference
Event Dates:13.-15. Nov. 2012
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):other
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Dr.-Ing. Christian Willberg
Deposited On:27 Nov 2012 08:59
Last Modified:27 Nov 2012 08:59

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