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    <publishedYear>2024</publishedYear>
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    <language>eng</language>
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    <pageLast>418</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
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    <publisherName>The International Institute of Acoustics and Vibration (IIAV)</publisherName>
    <publisherPlace>Amsterdam</publisherPlace>
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    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
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    <title language="eng">On the repulsion effect of coupled Lamb wave modes</title>
    <abstract language="eng">Lamb waves, recognized for their significance in material characterisation, structural health monitor-ing, and non-destructive testing, exhibit complex behaviours that are crucial for industrial applica-tions. This paper delves into the mathematical and physical principals of the repulsion effect that can be observed in the dispersion curves of coupled Lamb wave modes. This effect is the result from the mechanical coupling of thin-walled solid plates and prevents the crossing of the dispersion curves. The study employs the Scaled Boundary Finite Element Method to calculate the dispersion curves of coupled plates and to simulate their interaction for a weak and ideal coupling. Through a mathemati-cal framework and a physical analogy with simple harmonic oscillators, the paper elucidates the un-derlying principals of this effect. Furthermore, the paper highlights the practical significance of the repulsion effect in Lamb waves, suggesting its application for testing and monitoring the integrity of multi-layer structures like adhesive bonds, which are important for various industrial applications. A deepened understanding of this effect could contribute to the enhancement of non-destructive evalua-tion techniques.</abstract>
    <parentTitle language="eng">Proceedings of the 30th International Congress on Sound and Vibration</parentTitle>
    <identifier type="issn">2329-3675</identifier>
    <identifier type="isbn">978-90-90-39058-1</identifier>
    <enrichment key="eventName">ICSV 2024</enrichment>
    <enrichment key="eventPlace">Amsterdam, The Netherlands</enrichment>
    <enrichment key="eventStart">08.07.2024</enrichment>
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    <author>Marcel Nicolai</author>
    <author>Jannis Bulling</author>
    <author>Yevgeniya Lugovtsova</author>
    <author>Henning Zeipert</author>
    <author>Jens Prager</author>
    <author>Bernd Henning</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Scaled Boundary Finite Element Method (SBFEM)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Lamb waves</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mode repulsion</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mechanical coupling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Dispersion curves</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.4 Akustische und elektromagnetische Verfahren</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>62854</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>632</pageFirst>
    <pageLast>635</pageLast>
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    <edition/>
    <issue/>
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    <creatingCorporation>D. Gesellschaft für Akustik e.V. (Ed.)</creatingCorporation>
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    <title language="eng">On the repulsion effect of coupled Lamb wave modes</title>
    <abstract language="eng">This work investigates the phenomenon of mode repulsion in coupled Lamb wave systems. By mechanically coupling two dissimilar plates using spring elements, it is shown that previously intersecting Lamb wave modes are repelled, avoiding any crossing in the dispersion curves. The effect, rooted in eigenvalue theory and first observed in quantum systems, is explained through both mathematical models and classical analogies with coupled harmonic oscillators. Numerical simulations using the Scaled Boundary Finite Element Method validate the theoretical predictions, revealing a correlation between strain distribution and frequency splitting. The observed mode repulsion provides new insights into interface properties and offers potential for applications such as monitoring adhesive degradation in layered structures.</abstract>
    <parentTitle language="eng">Fortschritte Der Akustik - DAGA 2024</parentTitle>
    <enrichment key="eventName">DAGA 2024</enrichment>
    <enrichment key="eventPlace">Hannover, Germany</enrichment>
    <enrichment key="eventStart">18.03.2024</enrichment>
    <enrichment key="eventEnd">21.03.2024</enrichment>
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    <author>Marcel Nicolai</author>
    <author>Jannis Bulling</author>
    <author>Yevgeniya Lugovtsova</author>
    <author>Henning Zeipert</author>
    <author>Jens Prager</author>
    <author>Bernd Henning</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Scaled Boundary Finite Element Method (SBFEM)</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Lamb waves</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mode repulsion</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mechanical coupling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Dispersion curves</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.4 Akustische und elektromagnetische Verfahren</collection>
    <collection role="themenfelder" number="">Material</collection>
    <collection role="themenfelder" number="">Degradationsmechanismen</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>53581</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1532</pageFirst>
    <pageLast>1535</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
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    <title language="eng">Quantifying the coupling strength of adhesively bonded materials by investigating mode repulsion regions</title>
    <abstract language="eng">In the field of non-destructive testing, Lamb waves are often used for material characterisation. The increasing computational capabilities further enable complex and detailed simulations to predict the material behaviour in reality. Since adhesive bonding of different materials is a widely used method in modern applications, a reliable measurement system to determine the quality of these adhesive bonds is needed. Investigations of the dispersive behaviour of acoustic waves in adhesively bonded multi-layered waveguides show mode repulsions in the dispersion diagrams in regions where the modes of the single materials would otherwise intersect. In previous works, changes of the distance between those modes with respect to the bonding quality are observed. The experimental data for this investigation is generated using pulsed laser radiation to excite broadband acoustic waves in plate like specimens which are detected by a piezoelectric ultrasonic transducer. Numerical data is generated using simulations via a semi-analytical finite element method. Using a combination of experimental and numerical data, the present work introduces an approach to determine a parameter which indicates the bonding quality in relation&#13;
to an ideal material coupling.</abstract>
    <parentTitle language="eng">Tagungsband DAGA 2021 - 47. Jahrestagung für Akustik</parentTitle>
    <enrichment key="eventName">DAGA 2021</enrichment>
    <enrichment key="eventPlace">Vienna, Austria</enrichment>
    <enrichment key="eventStart">15.08.2021</enrichment>
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    <author>H. Zeipert</author>
    <author>S. Johannesmann</author>
    <author>Marcel Nicolai</author>
    <author>Yevgeniya Lugovtsova</author>
    <author>Jens Prager</author>
    <author>B. Henning</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic guided waves</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Multi-layered structures</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Laser excited ultrasonic waves</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.4 Akustische und elektromagnetische Verfahren</collection>
    <collection role="themenfelder" number="">Chemie und Prozesstechnik</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>52634</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>91</pageFirst>
    <pageLast>92</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
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    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Measurement and simulation of Lamb waves in adhesive-bonded multilayer systems</title>
    <abstract language="eng">Lamb waves are a common tool in the field of non-destructive testing and are widely used for materialcharacterisation. Further, the increasing computational capability of modern systems enables the Simulation of complex and detailed material models. This work demonstrates the possibility of simulating an adhesive-bonded multilayer system by characterising each layer individually, and introduces an Approach for determining the dispersive behaviour of acoustic waves in a multilayer system via real measurements.</abstract>
    <parentTitle language="eng">SMSI 2021 - Measurement Science</parentTitle>
    <identifier type="doi">10.5162/SMSI2021/A8.2</identifier>
    <enrichment key="eventName">SMSI 2021 Conference – Sensor and Measurement Science International</enrichment>
    <enrichment key="eventPlace">Online meeting</enrichment>
    <enrichment key="eventStart">03.05.2021</enrichment>
    <enrichment key="eventEnd">06.05.2021</enrichment>
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    <author>H. Zeipert</author>
    <author>L. Claes</author>
    <author>S. Johannesmann</author>
    <author>M. Webersen</author>
    <author>Yevgeniya Lugovtsova</author>
    <author>Jens Prager</author>
    <author>B. Henning</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Adhesive bonds</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Lamb waves</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Elastic constants</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Non-Destructive Testing</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasound</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.4 Akustische und elektromagnetische Verfahren</collection>
    <collection role="themenfelder" number="">Chemie und Prozesstechnik</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>53769</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>rus</language>
    <pageFirst>1</pageFirst>
    <pageLast>3</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
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    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="rus">К определению прочности клеевого соединения в многослойных материалах путем исследования областей расталкивания бегущих упругих волн</title>
    <title language="eng">Towards the determination of adhesive bonding strength of multi-layered materials by investigating guided wave mode repulsion</title>
    <abstract language="rus">Бегущие упругие волны часто используются в области неразрушающего контроля для определения механических характеристик материалов. Поскольку склеивание различных материалов является широко используемым методом в автомобильной и авиационной промышленности, необходима надежная система измерения для определения качества таких клеевых соединений. Дисперсионные кривые для многослойных волноводов при наличии клеевых прослоек характеризуются появлением эффекта расталкивания нормальных мод в тех областях, где соответствующие моды для отдельных материалов пересекались бы. Таким образом, в зависимости от качества клеевого соединения расстояние между этими модами изменяется. Используя комбинацию экспериментальных и численных данных, в настоящей работе представлен подход к определению параметра, указывающего на качество клеевого соединения.</abstract>
    <parentTitle language="rus">Сборник тезисов XXX Всероссийской школы-конференции МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ В ЕСТЕСТВЕННЫХ НАУКАХ</parentTitle>
    <enrichment key="eventName">XXX Всероссийская школа-конференция МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ В ЕСТЕСТВЕННЫХ НАУКАХ</enrichment>
    <enrichment key="eventPlace">Online meeting</enrichment>
    <enrichment key="eventStart">06.10.2021</enrichment>
    <enrichment key="eventEnd">09.10.2021</enrichment>
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    <author>Yevgeniya Lugovtsova</author>
    <author>H. Zeipert</author>
    <author>S. Johannesmann</author>
    <author>Marcel Nicolai</author>
    <author>Jens Prager</author>
    <author>B. Henning</author>
    <subject>
      <language>rus</language>
      <type>uncontrolled</type>
      <value>многослойный волновод</value>
    </subject>
    <subject>
      <language>rus</language>
      <type>uncontrolled</type>
      <value>волны лэмбовского типа</value>
    </subject>
    <subject>
      <language>rus</language>
      <type>uncontrolled</type>
      <value>контроль качества клеевого соединения</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.4 Akustische und elektromagnetische Verfahren</collection>
    <collection role="themenfelder" number="">Chemie und Prozesstechnik</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>57378</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <pageLast>826</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
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    <publisherName>Deutsche Gesellschaft für Akustik e.V.</publisherName>
    <publisherPlace>Berlin</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Characterization of adhesion strength using guided ultrasonic waves</title>
    <abstract language="deu">Klebeverbindungen sind aus vielen Anwendungen wie dem Leichtbau nicht mehr wegzudenken. Durch die Verklebung gleicher oder ungleicher Materialien entstehen viele Vorteile gegenüber konservativen Fügeverfahren. Jedoch stellen schwache Haftfestigkeiten eine sehr unbeliebte Fehlerart dar, die schlecht zu detektieren sind und zu einem frühzeitigen Versagen der Verklebung bei vergleichsweise geringen Belastungen führen können. Aufgrund hoher Sicherheits- und Qualitätsansprüche wird die Haftfestigkeit dieser Verbindungen jedoch noch immer zerstörend geprüft. Zufriedenstellende zerstörungsfreie Verfahren, um Haftfestigkeiten zu prüfen, sind nicht vorhanden und Thema gegenwärtiger Forschung. Ein Ansatz, der in diesem Projekt verfolgt wird, liegt in der Verwendung geführter Ultraschallwellen.&#13;
Hierzu wird anhand von Simulationen mittels der Scaled Boundary Finite Element Methode gezeigt, dass die gezielte Auswertung bestimmter Bereiche des Dispersionsdiagrams, den sogenannten vermiedenen Kreuzungen (engl. mode repulsion regions), eine Charakterisierung der Haftfestigkeiten zulassen könnten. Dies liegt darin begründet, dass die mittleren mechanischen Belastungen der Kleberschicht in diesen Bereichen ein lokales Maximum aufweisen und daher eine erhöhte Sensitivität auf Materialänderungen haben. Es wird gezeigt, wie sensitiv diese Bereiche auf Materialänderungen in der Klebergrenzschicht sind und welche potenziellen Fehlergrößen existieren.</abstract>
    <parentTitle language="deu">Fortschritte der Akustik - DAGA 2023</parentTitle>
    <identifier type="isbn">978-3-939296-21-8</identifier>
    <identifier type="url">https://pub.dega-akustik.de/DAGA_2023</identifier>
    <enrichment key="eventName">DAGA 2023</enrichment>
    <enrichment key="eventPlace">Hamburg, Germany</enrichment>
    <enrichment key="eventStart">06.03.2023</enrichment>
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    <author>Marcel Nicolai</author>
    <author>H. Zeipert</author>
    <author>Yevgeniya Lugovtsova</author>
    <author>Jannis Bulling</author>
    <author>S. Johannesmann</author>
    <author>Jens Prager</author>
    <author>B. Henning</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>SBFEM</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Adhesive Bonding</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Kissing Bonds</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>NDT</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ultrasonic Guided Waves</value>
    </subject>
    <collection role="ddc" number="543">Analytische Chemie</collection>
    <collection role="institutes" number="">8 Zerstörungsfreie Prüfung</collection>
    <collection role="institutes" number="">8.4 Akustische und elektromagnetische Verfahren</collection>
    <collection role="themenfelder" number="">Chemie und Prozesstechnik</collection>
    <collection role="fulltextaccess" number="">Datei im Netzwerk der BAM verfügbar ("Closed Access")</collection>
    <collection role="literaturgattung" number="">Graue Literatur</collection>
  </doc>
  <doc>
    <id>57379</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>deu</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
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    <issue/>
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    <type>lecture</type>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="deu">Charakterisierung von Haftfestigkeiten mittels geführter Ultraschallwellen</title>
    <abstract language="deu">Klebeverbindungen sind aus vielen Anwendungen wie dem Leichtbau nicht mehr wegzudenken. Durch die Verklebung gleicher oder ungleicher Materialien entstehen viele Vorteile gegenüber konservativen Fügeverfahren. Jedoch stellen schwache Haftfestigkeiten eine sehr unbeliebte Fehlerart dar, die schlecht zu detektieren sind und zu einem frühzeitigen Versagen der Verklebung bei vergleichsweise geringen Belastungen führen können. Aufgrund hoher Sicherheits- und Qualitätsansprüche wird die Haftfestigkeit dieser Verbindungen jedoch noch immer zerstörend geprüft. Zufriedenstellende zerstörungsfreie Verfahren, um Haftfestigkeiten zu prüfen, sind nicht vorhanden und Thema gegenwärtiger Forschung. Ein Ansatz, der in diesem Projekt verfolgt wird, liegt in der Verwendung geführter Ultraschallwellen.&#13;
Hierzu wird anhand von Simulationen mittels der Scaled Boundary Finite Element Methode gezeigt, dass die gezielte Auswertung bestimmter Bereiche des Dispersionsdiagrams, den sogenannten vermiedenen Kreuzungen (engl. mode repulsion regions), eine Charakterisierung der Haftfestigkeiten zulassen könnten. Dies liegt darin begründet, dass die mittleren mechanischen Belastungen der Kleberschicht in diesen Bereichen ein lokales Maximum aufweisen und daher eine erhöhte Sensitivität auf Materialänderungen haben. Es wird gezeigt, wie sensitiv diese Bereiche auf Materialänderungen in der Klebergrenzschicht sind und welche potenziellen Fehlergrößen existieren.</abstract>
    <enrichment key="eventName">Schall 23</enrichment>
    <enrichment key="eventPlace">Wetzlar, Germany</enrichment>
    <enrichment key="eventStart">20.03.2023</enrichment>
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    <title language="eng">C6-a3 - Monitoring the curing process of adhesive bonds using selective excitation of guided ultrasonic waves</title>
    <abstract language="eng">A measurement setup for the selective excitation of guided ultrasonic waves in adhesively bonded plates is introduced. Changes of the dispersive behaviour of the guided waves during the curing process is known to be accompanied by a change in the propagating waves group velocities. The proposed measurement setup is used to monitor that change during the curing process of an aluminium-epoxy-polycarbonate bond.</abstract>
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