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The Quasi-Harmonic Ultrasonic Polar Scan for Material Characterization: Experiment and Numerical Modeling Vrije Universiteit Brussel KU Leuven Ghent University
Conventionally, the ultrasonic polar scan (UPS) records the amplitude or time of flight in reflection or transmission using short ultrasonic pulses for a wide range of incidence angles, resulting in a unique fingerprint of the critical bulk wave angles of the material at the insonified spot. Here, we investigate the use of quasi-harmonic ultrasound (bursts) in a polar scan experiment, experimentally as well as numerically. It is shown that the ...
The Quasi-Harmonic Ultrasonic Polar Scan for Material Characterization: Experiment and Numerical Modeling KU Leuven
The conventional ultrasonic polar scan (UPS) records the transmitted amplitude of an acoustic pulse for a certain solid angle, resulting into a unique fingerprint of the local critical bulk wave angles, which relate to the local elasticity tensor at the insonified material spot. Numerical plane wave computations reveal that the use of harmonic sound, instead of sound pulses, provides a picture that exposes the leaky Lamb wave angles. For the ...
Matching spectroscopy with the ultrasonic polar scan for advanced NDT of composites KU Leuven
The Pulsed Ultrasonic Polar Scan (P-UPS) is a powerful technique for characterizing anisotropic materials like fiber reinforced plastics. A time-domain analysis of the ultrasonic signals yields amplitude and time-of-flight polar diagrams that provide a fingerprint of the local stiffness properties. Though, this simple analysis ignores a lot of information contained in the ultrasonic signals. In this study, we propose to use the P-UPS technique ...
Visco-elastic material characterisation by means of the Ultrasonic Polar Scan KU Leuven
Advances in material science and engineering have always been a key factor in any kind of progress made at the industrial scene. The drive towards novel, lighter and stronger materials, for instance, empowered companies to construct the highly efficient airplanes and automobiles as we know them today. One of the main protagonist in this development is the initiation and subsequent investigation of composite (and multilayered) materials, such as ...
Detection and Localization of Delaminations in Thin Carbon Fiber Reinforced Composites with the Ultrasonic Polar Scan KU Leuven Ghent University
© 2014, Springer Science+Business Media New York. In this paper, the hybrid compliance-stiffness matrix method for simulating wave propagation in (delaminated) multilayered media with viscoelastic anisotropy has been confronted with high-quality amplitude and phase experiments on delaminated composites, obtained using the ultrasonic polar scan setup (UPS) in transmission by considering harmonic as well as pulsed ultrasound. Results are presented ...
Ultrasonic polar scan imaging of fatigued fiber reinforced composites Ghent University
This study extends the use of both the amplitude and time-of-flight based pulsed ultrasonic polar scan (P-UPS) towards the inspection of damaged composite materials, more specifically fatigued carbon fabric reinforced thermoplastics (CETEX). The results demonstrate the excellent capability of the P-UPS method for nondestructively assessing and quantifying both shear-dominated and tension-tension fatigue damage in fabric reinforced plastics. The ...
Extraction of dispersion curves from a phased array based ultrasonic polar scan : simulation study Ghent University
Simulation of a circular phased array for a portable ultrasonic polar scan KU Leuven Ghent University
The development of new composite materials, often anisotropic in nature, requires intricate approaches to characterize these materials and to detect internal defects. The Ultrasonic Polar Scan (UPS) is able to achieve both goals. During an UPS experiment, a material spot is insonified at several angles ( , ), after which the reflected or transmitted signal is recorded. While excellent results have been obtained using an in-house developed 5-axis ...