Mesnil, Olivier; CEA; France
Chapuis, B.; CEA, LIST; France
Demaldent, E.; CEA, LIST; France
Imperiale, A.; CEA, LIST; France
Mesnil, O.; CEA, LIST; France
Session: Structural Health Monitoring 3
Time: 09:00 - 09:20
Structural Health Monitoring (SHM) consists in permanently installing sensors onto or into a structure in order to monitor its health without disturbing its regular operating cycle. Guided wave based SHM relies on the propagation of guided waves in plate-like or extruded structures and on the interaction of guided waves with all types of flaws (corrosion, delamination, cracks…). Using piezoelectric transducers to generate and receive guided waves is one of the most widely accepted solution due to the low cost and low weight of those sensors. A wide range of techniques for flaw detection based on the aforementioned setup is available in the literature but very few of these techniques have found industrial applications yet. A major difficulty comes from the sensitivity of guided waves to a substantial number of parameters such as the temperature or geometrical singularities, making guided wave measurement difficult to analyze. There is also a widely recognized need for a better understanding of the performances of SHM systems and to determine crucial parameters such as sensors density requirements or the minimal flaw size guaranteed to be detected by a given SHM system.
In order to answer those questions and transfer those techniques to the industry, the CEA LIST develops novel numerical methods. These methods facilitate the evaluation of the robustness of SHM techniques for multiple applicative cases and ease the analysis of the influence of various parameters, such as sensors density or environmental conditions. A special consideration is given to simulation performances and computational time in order to offer ready-to-use tools for industrials through a dedicated module in a future release of CIVA, which is the reference platform in NDT modeling. The considered geometries are plate-like structures with a wide range of parameters such as curvature, presence of stiffeners or different types of composite materials.