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Lamb Wave Interaction at Delamination and Debondings Due to Impact Damage in Complex Stiffened CFRP Structures

Eckstein, Benjamin and Moix-Bonet, Maria and Bach, Martin and Fritzen, Klaus-Peter (2018) Lamb Wave Interaction at Delamination and Debondings Due to Impact Damage in Complex Stiffened CFRP Structures. ASME Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4039692 ISSN 2572-3901

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Official URL: http://nondestructive.asmedigitalcollection.asme.org/article.aspx?articleid=2676654

Abstract

The increased usage of carbon fiber reinforced plastics (CFRP) for primary aerospace structures involves dealing with the susceptibility of composite laminates to impact loads as well as the occurrence of barely visible impact damages. One special case among impact sources is the so-called blunt impact, which may cause damage primarily to the internal structure. Therefore, the assessment of debonding of stiffening elements in CFRP structures poses an attractive application case for structural health monitoring by guided ultrasonic waves. Wave propagation phenomena at impact damages as well as the signal processing utilized to extract a damage related feature (i.e., damage index (DI)) contribute to the sensitivity, and thus, to the reliability of structural health monitoring (SHM) systems. This work is based on data from the EU-funded project SARISTU, where a generic CFRP door surrounding fuselage panel with an integrated sensor network has been built and tested by introducing a large number of impact damages. Wave interaction of delaminations and stringer debondings of different size and morphology in omega-stringer stiffened structures are examined to highlight the factors contributing to the sensitivity. Common damage indicator formulations for the use with imaging algorithms, such as the reconstruction algorithm for the probabilistic inspection of damage (RAPID), are applied on data from various damage cases. Furthermore, the difference in detectability of delaminations and debondings as well as the implications on imaging algorithms is examined.

Item URL in elib:https://elib.dlr.de/120727/
Document Type:Article
Title:Lamb Wave Interaction at Delamination and Debondings Due to Impact Damage in Complex Stiffened CFRP Structures
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Eckstein, BenjaminAirbus GmbHUNSPECIFIED
Moix-Bonet, MariaMaria.Moix-Bonet (at) dlr.deUNSPECIFIED
Bach, MartinAirbus HelicoptersUNSPECIFIED
Fritzen, Klaus-PeterUniversity of SiegenUNSPECIFIED
Date:2018
Journal or Publication Title:ASME Journal of Nondestructive Evaluation, Diagnostics and Prognostics of Engineering Systems
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.1115/1.4039692
Publisher:American Society of Mechanical Engineers (ASME)
Series Name:ASME Journal of Nondestructive Evaluation
ISSN:2572-3901
Status:Published
Keywords:SHM, Acousto Ultrasonics, Damage Detection, Composites, Aeronautic Structures
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Multifunctional Materials
Deposited By: Moix-Bonet, Maria
Deposited On:09 Jul 2018 08:49
Last Modified:06 Aug 2018 08:55

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