Damage Assessment of Composite Plate Structures with Uncertainty

Abstract : Uncertainties associated with a structural model and measured vibration data may lead to unreliable damage detection. Two similar structures made from composite materials can display very different dynamic behavior due to large uncertainties associated with composite material properties. In this paper, we show that material uncertainties in composite structures cause considerable problem in damage assessment which can be alleviated by using a fuzzy logic-based approach for damage detection. A recently proposed robust Fuzzy Logic System (FLS) with sliding window defuzzifier is used for delamination damage detection in composite plate type structures. The FLS is designed using variations in modal frequencies due to randomness in material properties. Probabilistic analysis is performed using Monte Carlo Simulation (MCS) on a composite plate finite element model. A recently developed Reddy type C0 shear deformable locking free refined composite plate element is employed in the numerical simulations to alleviate modeling uncertainty. It is demonstrated that the FLS shows excellent robustness at very high levels of randomness in input data.
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Le Cam, Vincent and Mevel, Laurent and Schoefs, Franck. EWSHM - 7th European Workshop on Structural Health Monitoring, Jul 2014, Nantes, France. 2014
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Chandrashekhar M, Ranjan Ganguli. Damage Assessment of Composite Plate Structures with Uncertainty. Le Cam, Vincent and Mevel, Laurent and Schoefs, Franck. EWSHM - 7th European Workshop on Structural Health Monitoring, Jul 2014, Nantes, France. 2014. 〈hal-01021225〉

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