Damage Detection in a Composite T-Joint Using Guided Lamb Waves
AbstractLow velocity impact induces barely visible damage in the form of matrix cracking or delamination that can grow under hydro-thermo-mechanical loading and possibly lead to catastrophic failure if not detected at an early stage. A network of piezoelectric transducers can be used to monitor a structure over time for life prognosis through generation and sensing of guided ultrasonic waves. The aim of this study is to design and develop such a sensing method for damage assessment in a composite T-joint subjected to mechanical impacts. In this context, monitoring of Lamb waves in a carbon fibre reinforced polymer (CFRP) T-joint has been completed where dispersion and tuning curves have been obtained. Guided waves are transmitted into the structure through different specified pairs of surface-bonded lead-zirconate-titanate (PZT) transducers in a pitch–catch active structural health monitoring (SHM) approach. With these experiments, Lamb wave fundamental modes (A0 and S0) are identified for monitoring impact damage by signal comparison with a prior obtained baseline. Detecting 4J and 10J inner impacts within the central region of the specimen is challenging when using conventional non-destructive techniques (NDT) because of the complex geometry and interference with the web. Signals are compared for the same selected sensing path; and amplitude differences have been observed in tuning curves after the 10J impact, which implies the occurrence of a structural change related to the impact. View Full-Text
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Philibert, M.; Soutis, C.; Gresil, M.; Yao, K. Damage Detection in a Composite T-Joint Using Guided Lamb Waves. Aerospace 2018, 5, 40.
Philibert M, Soutis C, Gresil M, Yao K. Damage Detection in a Composite T-Joint Using Guided Lamb Waves. Aerospace. 2018; 5(2):40.Chicago/Turabian Style
Philibert, Marilyne; Soutis, Constantinos; Gresil, Matthieu; Yao, Kui. 2018. "Damage Detection in a Composite T-Joint Using Guided Lamb Waves." Aerospace 5, no. 2: 40.
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