NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Extension-twist coupling of composite circular tubes with application to tilt rotor blade designThis investigation was conducted to determine if twist deformation required for the design of full-scale extension-twist-coupled tilt-rotor blades can be achieved within material design limit loads, and to demonstrate the accuracy of a coupled-beam analysis in predicting twist deformations. Two extension-twist-coupled tilt-rotor blade designs were developed based on theoretically optimum aerodynamic twist distributions. The designs indicated a twist rate requirement of between .216 and .333 deg/in. Agreement between axial tests and analytical predictions was within 10 percent at design limit loads. Agreement between the torsion tests and predictions was within 11 percent.
Document ID
19870046311
Document Type
Conference Paper
Authors
Nixon, Mark W. (NASA Langley Research Center; U.S. Army, Aviation Research and Technology Activity, Hampton VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Subject Category
STRUCTURAL MECHANICS
Report/Patent Number
AIAA PAPER 87-0772
Distribution Limits
Public
Copyright
Other