Structural health monitoring of sandwich composite structures, characterization and non-destructive evaluation of adhesion and aging - Finite element modeling and experimentation by impedance measurement and phased arrays
Identifieur interne : 000239 ( Main/Exploration ); précédent : 000238; suivant : 000240Structural health monitoring of sandwich composite structures, characterization and non-destructive evaluation of adhesion and aging - Finite element modeling and experimentation by impedance measurement and phased arrays
Auteurs : Elhadji Barra Ndiaye [France]Source :
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Abstract
This thesis focuses on the ultrasonic non-destructive testing and evaluation (NDT&E) of composite materials contributing in part to the concept of structural health monitoring (SHM). Specifically, adhesion phenomena and aging of composite sandwich core honeycomb structures are of crucial interest for aeronautics. The properties related to these two phenomena were studied using theoretical models, numerical simulations and experimental results. Based on previous works, using Lamb waves allow to characterize adhesion and aging. Additional simulations were carried out with the finite element software Comsol Multiphysics©.Adhesion defects such as delamination or debonding at the interfaces have been detected and located by means of the sliding window Fourier transform (SWFT), both numerically and experimentally. In view of NDT industrial rates, phased array transducers allow inspection and characterization of local bonding. By comparison, the Debye series method (DSM) was conducted locally to solve the inverse problem of a cut plane of a honeycomb composite.First, sandwich structure aging was investigated using Lamb waves in the air. Second, the aging was evaluated by measuring the electromechanical impedance of a transducer in contact with the samples. These experimental results show that the resonance frequencies and widths variations depend on the degree of porosity, indicating the sensitivity of these methods to the aging.
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Finite element modeling and experimentation by impedance measurement and phased arrays</title><title xml:lang="fr">Contrôle santé de structures sandwichs composites, caractérisation et évaluation non destructives de l’adhésion et du vieillissement - Simulations par éléments finis et expérimentation par mesure d’impédance et par ultrasons multiéléments</title><author><name sortKey="Ndiaye, Elhadji Barra" sort="Ndiaye, Elhadji Barra" uniqKey="Ndiaye E" first="Elhadji Barra" last="Ndiaye">Elhadji Barra Ndiaye</name><affiliation wicri:level="1"><hal:affiliation type="laboratory" xml:id="struct-242311" status="INCOMING"><orgName>Laboratoire Ondes et Milieux Complexes</orgName><orgName type="acronym">UMR CNRS 6294 LOMC</orgName><desc><address><addrLine>53, rue de Prony, BP 540, 76058 Le Havre Cedex</addrLine><country key="FR"></country></address><ref type="url">http://www.univ-lehavre.fr/recherche/lomc/</ref></desc><listRelation><relation active="#struct-300317" type="direct"></relation></listRelation><tutelles><tutelle active="#struct-300317" type="direct"><org type="institution" xml:id="struct-300317" status="VALID"><orgName>Université du Havre</orgName><desc><address><country key="FR"></country></address></desc></org></tutelle></tutelles></hal:affiliation><country>France</country><placeName><settlement type="city">Le Havre</settlement><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region></placeName><orgName type="university">Université du Havre</orgName></affiliation></author></analytic></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>FEM</term><term>Lamb waves</term><term>NDT&E</term><term>adhesion</term><term>aging</term><term>electromechanical impedance.</term><term>honeycomb composites</term><term>phased array transducers</term></keywords><keywords scheme="mix" xml:lang="fr"><term>END/CND</term><term>MEF</term><term>composites nid d’abeille</term><term>impédance électromécanique.</term><term>ondes de Lamb</term><term>transducteurs multiéléments</term><term>vieillissement</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This thesis focuses on the ultrasonic non-destructive testing and evaluation (NDT&E) of composite materials contributing in part to the concept of structural health monitoring (SHM). Specifically, adhesion phenomena and aging of composite sandwich core honeycomb structures are of crucial interest for aeronautics. The properties related to these two phenomena were studied using theoretical models, numerical simulations and experimental results. Based on previous works, using Lamb waves allow to characterize adhesion and aging. Additional simulations were carried out with the finite element software Comsol Multiphysics©.Adhesion defects such as delamination or debonding at the interfaces have been detected and located by means of the sliding window Fourier transform (SWFT), both numerically and experimentally. In view of NDT industrial rates, phased array transducers allow inspection and characterization of local bonding. By comparison, the Debye series method (DSM) was conducted locally to solve the inverse problem of a cut plane of a honeycomb composite.First, sandwich structure aging was investigated using Lamb waves in the air. Second, the aging was evaluated by measuring the electromechanical impedance of a transducer in contact with the samples. These experimental results show that the resonance frequencies and widths variations depend on the degree of porosity, indicating the sensitivity of these methods to the aging.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Haute-Normandie</li><li>Région Normandie</li></region><settlement><li>Le Havre</li></settlement><orgName><li>Université du Havre</li></orgName></list><tree><country name="France"><region name="Région Normandie"><name sortKey="Ndiaye, Elhadji Barra" sort="Ndiaye, Elhadji Barra" uniqKey="Ndiaye E" first="Elhadji Barra" last="Ndiaye">Elhadji Barra Ndiaye</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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