Abstract
The dynamic mechanical response of a commercial prototype Leading Edge
Protection (LEP) coating based on polyurethane (PU) chemistry is analysed using
Dynamic Mechanical Thermal Analysis (DMTA) as a function of temperature and
frequency. The temperature range chosen reflects the operating range used in offshore wind turbines, with the damping characteristics of the coating maximal at 25°C. The Time Temperature Superposition (TTS) methodology was applied to the DMTA data to predict the viscoelastic behaviour of the PU LEP at frequencies (10-2 - 1010 Hz) consistent with the predicted strain rates induced by the impact of rain droplets on wind turbine blades (106 - 109 Hz). A Young’s modulus is reported for the PU of 2.78 x106 GPa at 108 s-1, compared with 278 MPa at 1 s-1 i.e. the equivalent of quasi-static testing. This method presents a potential for improved understanding of LEP material at high strain rates and a test methodology for generating material properties for coating lifetime prediction.
Protection (LEP) coating based on polyurethane (PU) chemistry is analysed using
Dynamic Mechanical Thermal Analysis (DMTA) as a function of temperature and
frequency. The temperature range chosen reflects the operating range used in offshore wind turbines, with the damping characteristics of the coating maximal at 25°C. The Time Temperature Superposition (TTS) methodology was applied to the DMTA data to predict the viscoelastic behaviour of the PU LEP at frequencies (10-2 - 1010 Hz) consistent with the predicted strain rates induced by the impact of rain droplets on wind turbine blades (106 - 109 Hz). A Young’s modulus is reported for the PU of 2.78 x106 GPa at 108 s-1, compared with 278 MPa at 1 s-1 i.e. the equivalent of quasi-static testing. This method presents a potential for improved understanding of LEP material at high strain rates and a test methodology for generating material properties for coating lifetime prediction.
Original language | English |
---|---|
Pages (from-to) | 16-24 |
Number of pages | 13 |
Journal | Sampe journal |
Volume | 57 |
Issue number | 3 |
Publication status | Published - 1 Oct 2021 |
Event | Society for the Advancement of Material and Process Engineering Europe Conference and Exhibition 2020 - Beurs van Berlage, Amsterdam, Netherlands Duration: 30 Sept 2020 → 1 Oct 2020 https://www.sampe-europe.org/conferences/se-conference-20-amsterdam |
Keywords
- Leading edge erosion
- Viscoelasticity
- wind turbines
- Coatings