Dynamic Based Damage Detection in Composite Structures
2009
Advanced composites are being used increasingly in state-of-the-art aircraft and aerospace structures. In spite of
their many advantages, composite materials are highly susceptible to hidden flaws that may occur at any time during
the life cycle of a structure, and if undetected, may cause sudden and catastrophic failure of the entire structure. This
paper is concerned with the detection and characterization of hidden defects in composite structures before they
grow to a critical size. A methodology for automatic damage identification and localization is developed using a
combination of vibration and wave propagation data. The structure is assumed to be instrumented with an array of
actuators and sensors to excite and record its dynamic response, including vibration and wave propagation effects. A
damage index, calculated from the measured dynamical response of the structure in a previous (reference) state and
the current state, is introduced as a determinant of structural damage. The indices are used to identify low velocity
impact damages in increasingly complex composite structural components. The potential application of the approach
in developing health monitoring systems in defects-critical structures is indicated.
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