Rain erosion resistance of injection moulded and compression moulded polybutylene terephthalate PBT

Offshore wind turbine rotor diameters still increase. Blade tip velocities are up to 110 m/s, giving rise to more severe raindrop impact conditions and related erosion of the wind turbine blades. In the current work droplet impingement erosion tests were performed for injection moulded and compressi...

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Bibliographic Details
Published in:Wear 2018-11, Vol.414-415, p.234-242
Main Authors: Slot, H.M., IJzerman, R.M., le Feber, M., Nord-Varhaug, K., van der Heide, E.
Format: Article
Language:English
Subjects:
Compression tests
Computer simulation
Confidence intervals
Droplet impingement
Droplets
Erosion
Erosion resistance
Fatigue life
Fatigue tests
Impact velocity
Impingement
Impingement erosion
Injection molding
Materials fatigue
Mathematical models
Measurement
Model testing
Nozzles
Polybutylene terephthalates
Polymers
Predictions
Rain
Rain erosion
S N diagrams
Soil erosion
Spraying
Surface fatigue
Terephthalate
Thermoplastics
Turbine blades
Water drops
Water pressure
Wind energy
Wind turbines
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Summary:Offshore wind turbine rotor diameters still increase. Blade tip velocities are up to 110 m/s, giving rise to more severe raindrop impact conditions and related erosion of the wind turbine blades. In the current work droplet impingement erosion tests were performed for injection moulded and compression moulded polybutylene terephthalate PBT. The measured incubation periods were compared to an extended and improved fatigue based erosion model. The developed erosion test set-up was based on a high water pressure nozzle system spraying water drops at a stationary PBT surface. Model results with thermoplastic materials simulating heavy rain conditions with a droplet size of 1.8 mm and an impact velocity of 120 m/s are shown. Model results with PBT materials simulating the used test conditions are shown and compared with the measured incubation periods. Although a reasonable similarity between test results and model calculations for the injection moulded PBT was found, the absolute value of the incubation period predicted by the model for compression moulded PBT differed substantially. This probably resulted from the lower confidence level of the S-N curve for the compression moulded PBT. The droplet impingement measurements and model predictions both showed a substantially higher incubation period for injection moulded PBT compared to compression moulded PBT. •Droplet impingement tests with injection moulded and compression moulded PBT were performed.•The test set-up is based on a high water pressure nozzle spraying water drops on a stationary specimen.•Surface fatigue predictive model for the rain erosion incubation period has been extended.•Model predictions have been made for a range of thermoplastic polymers.•Incubation periods measured with test set-up cannot be used for life predictions of wind turbine blades.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2018.08.016