Fatigue testing of low-cost fiberglass composite wind turbine blade materials
The static and fatigue behavior of transverse filament tape (TFT) fiberglass/epoxy and TFT/polyester composite was established by the testing of specimens cut from panels fabricated by a filament winding process used for the construction of large experimental wind turbine blades. Static mechanical properties obtained included tension, compression, and interlaminar shear at ambient conditions in high-humidity/high-temperature conditions after a 500-hour exposure to such an environment. The fatigue data were obtained at similar environmental exposures and at several R ratios including R = 0, 0.1, -0.25, -0.5, and -1. Negative ratios imply a compressive component of stress. Testing was performed to failure in many cases. S-N diagrams and a modified Goodman constant life plot were obtained for one of two types of the epoxy matrix composites. The elastic properties of the epoxy matrix materials showed a strong dependence only on the filament stiffness and angle and a weak influence of the high-humidity/high-temperature environment. The polyester materials showed a substantial decrease in compressive strength for some composites which had been exposed for over 4000 hours in the high-humidity/high-temperature environment.
- Research Organization:
- IIT Research Inst., Chicago, IL (USA)
- DOE Contract Number:
- AI01-76ET20320
- OSTI ID:
- 6320655
- Report Number(s):
- DOE/NASA/0182-1; NASA/CR-165566; ON: DE83009045
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
170602* -- Wind Energy Engineering-- Turbine Design & Operation
36 MATERIALS SCIENCE
360303 -- Composite Materials-- Mechanical Properties-- (-1987)
COMPOSITE MATERIALS
COMPRESSION
DATA
ELASTICITY
EPOXIDES
ESTERS
EXPERIMENTAL DATA
FATIGUE
FIBERGLASS
HUMIDITY
INFORMATION
MACHINERY
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
POLYESTERS
POLYMERS
SHEAR
STRESSES
TEMPERATURE EFFECTS
TENSILE PROPERTIES
TESTING
TURBINE BLADES
TURBINES
TURBOMACHINERY
WIND TURBINES