In Guided Wave Structural Health Monitoring (GW-SHM), performance demonstration is a key aspect required to mature the technologies from the laboratory to the industry. By analogy with Non-Destructive Evaluation (NDE), the computation of Probability of Detection (POD) curves would be a satisfying metric to do so. However, SHM specificities lead to the need to rethink the POD estimation for SHM. Among these specificities is the fact that the experimental generation of large datasets is prohibitively expensive due to the permanent integration of the sensors in SHM and the large area inspection of GW. Moreover, SHM solutions proposed using successive measurements acquired by a permanently installed sensor network on a growing defect face the difficulty of statistical dependency of data, violating the common NDE-POD assumptions. To tackle these difficulties, Model-Assisted POD (MAPOD), where experimental data complements numerically generated data, is seen as very promising to generate large statistically independent datasets.  
The use of modeling for the performance quantification of an SHM approach however requires a rigorous validation campaign of the simulation tools within the perimeter of the application. In this communication, is presented the ongoing validation work conducted on the SHM module of the CIVA software built for MAPOD GW-SHM studies. Validation is presented here on two aspects, first the propagation in both isotropic panels and anisotropic flat composite laminates. Second, a special care is given to the validation of the piezoelectric transduction with the structure. Simulated data is thoroughly compared with experimental data. For the composite case, the data provided by the Open Guided Wave \[1\] initiative is used for validation. Excellent agreement is found between the simulated and the experimental raw signals, as long as the variables influencing either the wave transduction or propagation are fully known, one of them being the elastic properties of the composite layers. This validation also highlights the limits of the existing models and provides the mean to conduct reliable MAPOD studies on GW-SHM. 

\[1\]: Moll, J.; Kathol, J.; Fritzen, C.-P.; Moix-Bonet, M.; Rennoch, M.; Koerdt, M.; Herrmann, A.; Sause, M. and Bach, M., „Open Guided Waves – Online Platform for Ultrasonic Guided Wave Measurements“, Structural Health Monitoring, 2019, vol. 18(5–6), 1903–1914, DOI: 10.1177/1475921718817169  
 


Validation of Spectral Finite Element Simulations for Large Numerical Campaigns in Mapod Shm

No proceedings papers in 2020. Video only.

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