TY  - JOUR
A1  - Moll, Jochen
A1  - Maetz, Thomas
A1  - Mälzer, Moritz
A1  - Krozer, Viktor
A1  - Mischke, Kevin
A1  - Krause, Stefan
A1  - Bagemiel, Oliver
A1  - Nuber, Andreas
A1  - Kremling, Stefan
A1  - Kurin, Thomas
A1  - Lurz, Fabian
A1  - Weigel, Robert
A1  - Issakov, Vadim
T1  - Radar-based monitoring of glass fiber reinforced composites during fatigue testing
T2  - Structural control & health monitoring
N2  - 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.
KW  - damage detection
KW  - fatigue testing
KW  - glass fiber reinforced materials
KW  - radar-based structural health monitoring
KW  - wind turbine blades
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/63924
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-639245
SN  - 1545-2263
N1  - The authors gratefully acknowledge the financial support of this research by the Federal Ministry for Economic Affairs and Energy (Grant Number: 0324324C).
VL  - 28
IS  - 10, art. e2812
SP  - 1
EP  - 7
PB  - Wiley
CY  - Hoboken, NJ
ER  -