An innovative method based on nonlinear Lamb waves behavior and Local Defect Resonance (LDR) is proposed for locating ad evaluating disbonds in Single-Lap Joints (SLJ) typically used in aerospace industry. The presence of damages/defects such as disbonds leads to the presence of sub-and super-harmonics components in the frequency response. Particular wave excitation frequencies promote nonlinear response of the structure causing LDR. The LDR frequency was experimentally evaluated through the appearance of a single subharmonic component in the frequency spectrum of signals received by piezoelectric transducers (PZTs) bonded on the structure. The nonlinear properties of Lamb waves were exploited to make defects generate subharmonic wave packets at LDR frequency. An algorithm was developed for damage/defect localization that was accurately performed by knowing (i) PZTs positions, (ii) Time of Flight (ToF) and (iii) propagation properties of subharmonics packet. Several disbonds with different dimensions were artificially reproduced on an aluminum SLJ: experimental results showed good accordance both in usual (single damage) and critical (multi-damage) scenario. The paper proposes a baseline-free method for the disbonds detection and localization in SLJs that uses the PZT signals without affecting adhesive interface, thus allowing an active health monitoring.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    An innovative method based on nonlinear Lamb waves for locating disbonds in Single-Lap joints


    Beteiligte:


    Erscheinungsdatum :

    01.06.2019


    Format / Umfang :

    3069926 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Mode conversions of Lamb waves for inspection of disbonds

    Sun, K.J. / Johston, P.H. | Tema Archiv | 1992


    The Buckling Stability of Disbonds in Composite Adhesive Lap Joints

    Kim, H. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2002



    Carrera unified formulation (CUF) for the analysis of disbonds in single lap joints (SLJ)

    Nicassio, Francesco / Cinefra, Maria / Scarselli, Gennaro et al. | British Library Conference Proceedings | 2022


    Detection of disbonds in a honeycomb composite structure using guided waves

    Baid, H. / Banerjee, S. / Joshi, S. et al. | Tema Archiv | 2008