Model-based damage evaluation of layered CFRP structures Muñoz Beltrán, Rafael Bochud, Nicolás Rus Carlborg, Guillermo Peralta, Laura Melchor Rodríguez, Juan Manuel Chiachío Ruano, Juan Chiachío Ruano, Manuel Bond, Leonard J. Nonlinear ultrasonics Carbon Fibre Reinforced Polymer CFRP Nondesctuctive evaluation Model-based evaluation Authors are grateful to Dr. H. Schmutzler from the Institute of Polymers and Composites, TU Hamburg, Germany, for providing us the damaged CFRP plate. An ultrasonic evaluation technique for damage identification of layered CFRP structures is presented. This approach relies on a model-based estimation procedure that combines experimental data and simulation of ultrasonic damage-propagation interactions. The CFPR structure, a [0/90]4s lay-up, has been tested in an immersion through transmission experiment, where a scan has been performed on a damaged specimen. Most ultrasonic techniques in industrial practice consider only a few features of the received signals, namely, time of flight, amplitude, attenuation, frequency contents, and so forth. In this case, once signals are captured, an algorithm is used to reconstruct the complete signal waveform and extract the unknown damage parameters by means of modeling procedures. A linear version of the data processing has been performed, where only Young modulus has been monitored and, in a second nonlinear version, the first order nonlinear coefficient β was incorporated to test the possibility of detection of early damage. The aforementioned physical simulation models are solved by the Transfer Matrix formalism, which has been extended from linear to nonlinear harmonic generation technique. The damage parameter search strategy is based on minimizing the mismatch between the captured and simulated signals in the time domain in an automated way using Genetic Algorithms. Processing all scanned locations, a C-scan of the parameter of each layer can be reconstructed, obtaining the information describing the state of each layer and each interface. Damage can be located and quantified in terms of changes in the selected parameter with a measurable extension. In the case of the nonlinear coefficient of first order, evidence of higher sensitivity to damage than imaging the linearly estimated Young Modulus is provided. 2024-02-12T08:52:50Z 2024-02-12T08:52:50Z 2015-03-31 info:eu-repo/semantics/article Rafael Munoz, Nicolas Bochud, Guillermo Rus, Laura Peralta, Juan Melchor, Juan Chiachío, Manuel Chiachío, Leonard J. Bond; Model-based damage evaluation of layered CFRP structures. AIP Conf. Proc. 31 March 2015; 1650 (1): 1170–1177. https://doi.org/10.1063/1.4914727 0094-243X https://hdl.handle.net/10481/88998 10.1063/1.4914727 eng 41st Annual Review of Progress in Quantitative Nondesctructive Evaluation 20–25 July 2014 Boise, Idaho;Volume 34 http://creativecommons.org/licenses/by-nc-sa/4.0/ info:eu-repo/semantics/openAccess Atribución-NoComercial-CompartirIgual 4.0 Internacional AIP Publishing