Structural properties of laminated Douglas fir/epoxy composite material
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- Sverdrup Technology, Inc., Cleveland, OH (USA)
- Gougeon Bros., Bay City, MI (USA)
This publication contains a compilation of static and fatigue and strength data for laminated-wood material made from Douglas fir and epoxy. Results of tests conducted by several organizations are correlated to provide insight into the effects of variables such as moisture, size, lamina-to-lamina joint design, wood veneer grade, and the ratio of cyclic stress to steady stress during fatigue testing. These test data were originally obtained during development of wood rotor blades for large-scale wind turbines of the horizontal-axis (propeller) configuration. Most of the strength property data in this compilation are not found in the published literature. Test sections ranged from round cylinders 2.25 in. in diameter to rectangular slabs 6 in. by 24 in. in cross section and approximately 30 ft long. All specimens were made from Douglas fir veneers 0.10 in. thick, bonded together with the WEST epoxy system developed for fabrication and repair of wood boats. Loading was usually parallel to the grain. Size effects (reduction in strength with increase in test volume) are observed in some of the test data, and a simple mathematical model is presented that includes the probability of failure. General characteristics of the wood/epoxy laminate are discussed, including features that make it useful for a wide variety of applications. 9 refs.
- Research Organization:
- NASA Lewis Research Center, Cleveland, OH (United States)
- Sponsoring Organization:
- DOE/CE; National Aeronautics and Space Administration (NASA)
- DOE Contract Number:
- AI01-76ET20320
- OSTI ID:
- 6492500
- Report Number(s):
- DOE/NASA/20320-76; NASA-RP-1236; ON: DE91000529
- Country of Publication:
- United States
- Language:
- English
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COMPOSITE MATERIALS
FATIGUE
MECHANICAL PROPERTIES
WOOD
COMPILED DATA
COMPRESSION STRENGTH
EPOXIDES
FIRS
JOINTS
SHEAR
TENSILE PROPERTIES
CONIFERS
DATA
INFORMATION
MATERIALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PINOPHYTA
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360603* - Materials- Properties