Download presentation
Presentation is loading. Please wait.
Published byRebecca Haynes Modified over 9 years ago
1
Georgia Tech School of Aerospace Engineering January 10, 2000 Improved Methods for Measurement of Extension-Twist Coupling in Composite Laminates Michael D. Schliesman
2
Georgia Tech School of Aerospace Engineering January 10, 2000 Introduction l Coupling in Off-Axis Laminates In-Plane Extension-Shear Coupling F F Extension-Twist Coupling
3
Georgia Tech School of Aerospace Engineering January 10, 2000 Introduction l Want to Use Extension-Twist Coupling in Design l Experimental Validation of Analytical Method l Requires Precise Experimental Data
4
Georgia Tech School of Aerospace Engineering January 10, 2000 Existing Testing Methods l Thrust-Bearing Apparatus l Rotating-Frame Apparatus l Air-Bearing Apparatus
5
Georgia Tech School of Aerospace Engineering January 10, 2000 Improving the Rotating-Frame Apparatus l Benefits High Fidelity to Rotor Blade Environment Investigation of Aeroelastic Characteristics l Problems to Overcome Restoring Moment Poor Method of Data Acquisition
6
Georgia Tech School of Aerospace Engineering January 10, 2000 Restoring Moment l Cylindrical End Mass Deflected Not Deflected POR
7
Georgia Tech School of Aerospace Engineering January 10, 2000 Data Acquisition l Laser Twist Measurement Base Window Laser End Mass Paper h
8
Georgia Tech School of Aerospace Engineering January 10, 2000 Improved Rotating-Frame Apparatus
9
Georgia Tech School of Aerospace Engineering January 10, 2000 Symmetric Testing Method [+ /- ] [- /+ ] Symmetric Test Specimen Net Twist of Specimen ++ F 0° F -- Twist of Specimen Components F ++
10
Georgia Tech School of Aerospace Engineering January 10, 2000 Symmetric Testing Method l Testing Setup
11
Georgia Tech School of Aerospace Engineering January 10, 2000 Predictions l Analytical Method Finite Displacement Analysis Closed Form Solution Geometric Nonlinear Effects l Numerical Method Finite Element Analysis (ABAQUS) 2200 S4R Elements Geometric Nonlinear Effects
12
Georgia Tech School of Aerospace Engineering January 10, 2000 Predictions l Analytical and Finite Element Predictions Axial Load (N) End Twist (deg)
13
Georgia Tech School of Aerospace Engineering January 10, 2000 Testing Results l Rectangular vs. Cylindrical End Mass Axial Load (N) End Twist (deg)
14
Georgia Tech School of Aerospace Engineering January 10, 2000 Testing Results l Aeroelastic Effect End Twist (deg) Angular Speed (rps) Chamber Evacuated Chamber Not Evacuated
15
Georgia Tech School of Aerospace Engineering January 10, 2000 Testing Results l Scatter in Symmetric Testing Method End Twist (deg) Axial Load (N)
16
Georgia Tech School of Aerospace Engineering January 10, 2000 Conclusions l Isolation of Extension-Twist Relationship Cylindrical End Mass Eliminated Restoring Moment Symmetric Method Provided Inconclusive Results l Dependent on Accuracy of Specimen Manufacturing l Simple Method Shows Promise l Vibration Visualization 1P Sampling of Twist Provides Dynamic Measurement Investigation of Aeroelastic Characteristics
17
Georgia Tech School of Aerospace Engineering January 10, 2000 Future Work l Refine Symmetric Testing Method Accurate Specimen Manufacturing Accurate Twist Measurement l Submit Method to ASTM
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.