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Material-integrated composite humidity sensors for condition monitoring of fiber-reinforced plastics

: Martin, J.; Shetty, K.; Reimann, N.; Neukirchner, S.; Fügmann, U.; Illing-Günther, H.; Nestler, D.; Hübler, A.C.; Nendel, K.; Kroll, L.; Otto, T.


Technologies for lightweight structures : TLS 1 (2017), Nr.2, S.128-137
ISSN: 2512-4587
Fraunhofer ENAS ()

Penetrating water in fiber-reinforced plastics can alter the mechanical properties considerably. To avoid potential resulting failure of the component, we propose continuous monitoring of the humidity inside the material by highly-sensitive humidity sensors based on nano- or microcomposites. Here we report on the inline-capable fabrication and integration of humidity sensors in glass fiber-reinforced polyamide (GF-PA6). Mean water concentrations of less than 0.5 wt. % have been clearly determined inside the laminate.