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structural design significance of tension-tension fatigue data on compositesConstant cycle tension-tension fatigue and related static tension data have been generated on six single composite material/orientation combinations and twenty-one hybrid composite material/orientation combinations. Anomalies are related to the temperature rise and stopped interval creep, whereas endurance limit stresses (runouts) are associated with static proportional limit values, when they occur, and internal damage. The significance of these room temperature-dry data on the design allowables and weight of aerodynamic structueres is discussed. Such structures are helicopter rotor blades and wing and horizontal stabilizer lower surfaces. Typical criteria for turning these data into preliminary allowables are shown, as are examples of such allowables developed from the data. These values are then compared to those that might be used if the structures were made of metal.
Document ID
19780028149
Document Type
Conference Proceedings
Authors
Grimes, G. C.
(Northrop Corp. Hawthorne, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Subject Category
COMPOSITE MATERIALS
Meeting Information
Conference on Composite materials: Testing and design(Valley Forge, PA)
Funding Number(s)
CONTRACT_GRANT: NAS1-12024
Distribution Limits
Public
Copyright
Other