Print Email Facebook Twitter A gaussian beam based recursive stiffness matrix model to simulate ultrasonic array signals from multi-layered media Title A gaussian beam based recursive stiffness matrix model to simulate ultrasonic array signals from multi-layered media Author Anand, C. (TU Delft Structural Integrity & Composites) Groves, R.M. (TU Delft Structural Integrity & Composites) Benedictus, R. (TU Delft Structural Integrity & Composites) Date 2020-08-02 Abstract Ultrasonic testing using arrays is becoming widely used to test composite structures in the Aerospace industry. In recent years, the Full Matrix Capture (FMC) technique has been implemented to extract the signals for post-processing to form an image. The inherent anisotropy and the layering of the structure pose challenges for the interpretation of this FMC data. To overcome this challenge, modeling techniques are required that take into account the diffraction caused by finite-size transducers and the response of the structure to these bounded beams. Existing models either homogenize the entire structure, use computationally expensive finite difference time domain (FDTD) methods, or do not consider the shape of the bounded beam, which is used to test such structures. This paper proposes a modeling technique based on combining the Multi-Gaussian beam model with the recursive stiffness matrix method to simulate the FMC signals for layered anisotropic media. The paper provides the steps required for the modeling technique, the extraction of the system efficiency factor, and validation of the model with experimentally determined signals for aluminum as an isotropic material such as aluminum and Carbon Fiber Reinforced Plastic (CFRP) laminate as a layered material. The proposed method is computationally inexpensive, shows good agreement with the experimentally determined FMC data, and enables us to understand the effects of various transducer and material parameters on the extracted FMC signals. Subject Angular spectrumCFRPFull matrix captureGaussian beamModelingRecursive stiffness matrix To reference this document use: http://resolver.tudelft.nl/uuid:f9f1e478-dc81-46d4-9da6-994888032ff4 DOI https://doi.org/10.3390/s20164371 ISSN 1424-8220 Source Sensors, 20 (16), 1-15 Part of collection Institutional Repository Document type journal article Rights © 2020 C. Anand, R.M. Groves, R. Benedictus Files PDF sensors_20_04371.pdf 1.32 MB Close viewer /islandora/object/uuid:f9f1e478-dc81-46d4-9da6-994888032ff4/datastream/OBJ/view