Radar-based monitoring of glass fiber reinforced composites during fatigue testing

Moll J, Maetz T, Maelzer M, Krozer V, Mischke K, Krause S, Bagemiel O, Nuber A, Kremling S, Kurin T, Lurz F, Weigel R, Issakov V (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Structural Control & Health Monitoring Wiley-Blackwell

DOI: 10.1002/stc.2812

Abstract

This work aims at radar sensors in the frequency band from 57 to 64 GHz that can be embedded in wind turbine blades during manufacturing, enabling non-destructive quality inspection directly after production and structural health monitoring (SHM) during the complete service life of the blade. In this paper, we show the fundamental damage detection capability of this sensor technology during fatigue testing of typical rotor blade materials. Therefore, a frequency modulated continuous wave (FMCW) radar sensor is used for damage diagnostics, and the results are validated by simultaneous camera recordings. Here, we focus on the failure modes delamination, fiber waviness (ondulation), and inter-fiber failure. For each failure mode, three samples have been designed and experimentally investigated during fatigue testing. A damage index has been proposed based on residual, that is, differential, signals exploiting measurements from pristine structural conditions. This study shows that the proposed innovative radar approach is able to detect continuous structural degradation for all failure modes by means of gradual signal changes.

Authors with CRIS profile

Thomas Kurin Lehrstuhl für Technische Elektronik (LTE) Fabian Lurz Lehrstuhl für Technische Elektronik (LTE) Robert Weigel Lehrstuhl für Technische Elektronik (LTE)

Involved external institutions

Goethe-Universität Frankfurt am Main DE Germany (DE) Wölfel Engineering GmbH + Co. KG DE Germany (DE) Fraunhofer-Institut für Windenergiesysteme (IWES) / Fraunhofer Institute for Wind Energy Systems DE Germany (DE) Infineon Technologies AG DE Germany (DE)

How to cite

APA:

Moll, J., Maetz, T., Maelzer, M., Krozer, V., Mischke, K., Krause, S.,... Issakov, V. (2021). Radar-based monitoring of glass fiber reinforced composites during fatigue testing. Structural Control & Health Monitoring. https://doi.org/10.1002/stc.2812

MLA:

Moll, Jochen, et al. "Radar-based monitoring of glass fiber reinforced composites during fatigue testing." Structural Control & Health Monitoring (2021).

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