A Modal-based Contribution to Damage Location in Laminated Composite Plates

Diogo Montalvao

    Research output: ThesisDoctoral Thesis

    2588 Downloads (Pure)

    Abstract

    The need for damage detection on complex structures at an early stage, has led to the development of techniques that evaluate changes on vibration parameters, since the dynamic response of a structure is dependent on its particular characteristics. The generality of the vibration based damage detection techniques are based on the fact that damage will induce a local reduction on the component stiffness.
    However, no single approach has proven appropriate for all situations. Composite materials, which are receiving an increasing attention in the aeronautical and other industries, namely Carbon Fibre Reinforced Polymers (CFRPs), are very sensitive to impacts of medium and low energy. Typically, Barely Visible Impact Damage (BVID) will occur, constituting an unsafe failure of difficult assessment. To assess (detect, locate and quantify) damage in this kind of material is still a challenge, especially if a huge amount of sensors or expensive equipments are not available.
    In this work, a methodology that makes use of a reduced amount of conventional sensors is explored, with the aim of locating damage on laminated components that are subjected to impacts during service for a low cost. This represents a considerable benefit, namely for the assessment of damage in aeronautical components, when compared to most methods used today.
    This work can also give a major contribution to the research community since uncommon approaches will be used to model damage in composite materials, namely the modal damping factor as feature for damage location.
    Original languageEnglish
    QualificationPhD
    Awarding Institution
    • Instituto Superior Técnico, Technical University of Lisbon
    Supervisors/Advisors
    • Ribeiro, A. M. R., Supervisor, External person
    • Duarte-Silva, J. A. B., Supervisor, External person
    Thesis sponsors
    Award date9 Feb 2010
    Publication statusPublished - 9 Feb 2010

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