Arvid Martens
Ghent University
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Featured researches published by Arvid Martens.
Journal of the Acoustical Society of America | 2015
Koen Van Den Abeele; Arvid Martens; Mathias Kersemans; Joris Degrieck; Steven Delrue; Wim Van Paepegem
The Ultrasonic Polar Scan (UPS) is a non-destructive technique which insonifies a material spot on a sample using ultrasonic pulses from as many oblique incidence angles ψ(φ,θ) as possible. Mapping the transmitted time-of-flight (TOF) and/or amplitudes as function of the incidence angle ψ(φ,θ) in a polar representation yields a UPS image with intriguing patterns that represent a fingerprint of the local visco-elastic properties. The present paper reports on recent advances in the revival of the UPS technique, involving the construction of an automated high-precision UPS scanner, the implementation of advanced simulation models as well as the development of efficient inversion routines. On the experimental level, unprecedented high quality TOF and amplitude UPS landscapes for a range of orthotropic (fiber reinforced) materials have been obtained. Using numerical simulation models, it can be readily demonstrated that the TOF UPS landscapes are directly connected to the elastic properties of the material, wh...
Review of Progress of Quantitative Nondestructive Evaluation | 2018
Jannes Daemen; Mathias Kersemans; Arvid Martens; Erik Verboven; Steven Delrue; Wim Van Paepegem; Joris Degrieck; Koen Van Den Abeele
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 Psi(theta,phi), after which the reflected or transmitted signal is recorded. While excellent results have been obtained using an in-house developed 5-axis scanner, UPS measurements with the current set-up are too lengthy and cumbersome for in-situ industrial application. Therefore, we propose to replace the complex mechanical steering of the transducers by a hemispherical phased array consisting of small PZT elements. This allows to create a compact and portable setup without compromising the current data quality. By successively activating a specific set of elements of the array and choosing appropriate inter-element time delays, the beam can be electronically steered from any angle to a fixed position on the targeted sample. Consequently, UPS reflection measurements can be performed at this position from a wide range of angles in a timeframe of seconds. Additionally, by using apodization windows, it is possible to efficiently reduce the intensity of unwanted side lobes and to create a phase profile which closely resembles that of a bounded plane wave, leading to an easier interpretation of the recorded data. The appropriate time delays and apodization parameters can be found though a multi-objective inverse problem in which both the phase profile and the side lobe reduction are optimized. This approach enables the creation of an effective beam profile to be used during UPS experiments for the characterization and inspection of composite materials. Our simulation approach is a crucial step towards a next-generation UPS device for industrial applications and in-field measurements.
Structural Health Monitoring-an International Journal | 2015
Mathias Kersemans; Arvid Martens; Wim Van Paepegem; Steven Delrue; Joris Degrieck; Koen Van Den Abeele
The ultrasonic polar scan (UPS) technique originated in the 1980s as a sophisticated method for inspecting composites. However, it is only in recent times that the true capabilities and strengths of the UPS methodology have been evidenced through experiment and simulation. Nowadays, the UPS method exists in different versions which led to several novel applications in the field of material inspection and characterization. This contribution gives an overview of our recent advances. doi: 10.12783/SHM2015/323
Applied Sciences | 2016
Mathias Kersemans; Arvid Martens; Joris Degrieck; Koen Van Den Abeele; Steven Delrue; Lincy Pyl; Filip Zastavnik; H. Sol; Wim Van Paepegem
Emerging Technologies in Non-Destructive Testing 6, Proceedings | 2015
Arvid Martens; Mathias Kersemans; Joris Degrieck; Wim Van Paepegem; Steven Delrue; Koen Van Den Abeele
Emerging Technologies in Non-Destructive Testing 6, Proceedings | 2015
Mathias Kersemans; Arvid Martens; Steven Delrue; Koen Van Den Abeele; Lincy Pyl; Filip Zastavnik; H. Sol; Joris Degrieck; Wim Van Paepegem
Proceedings of the 18th International Conference on Experimental Mechanics | 2018
Erik Verboven; Mathias Kersemans; Arvid Martens; Jannes Daemen; Steven Delrue; Koen Van Den Abeele; Wim Van Paepegem
MDPI Proceedings | 2018
Jannes Daemen; Arvid Martens; Mathias Kersemans; Erik Verboven; Steven Delrue; Wim Van Paepegem; Koen Van Den Abeele
Review of Progress of Quantitative Nondestructive Evaluation | 2017
Arvid Martens; Mathias Kersemans; Jannes Daemen; Steven Delrue; Wim Van Paepegem; Joris Degrieck; Koen Van Den Abeele
FEA Research Symposium 2017 | 2017
Mansour Kouyate; Mathias Kersemans; Wim Van Paepegem; Joris Degrieck; Arvid Martens; Jannes Daemen; Steven Delrue; Koen Van Den Abeele