Filament Winding Impregnation Study - University of Minnesota€¦ · Filament Winding Impregnation...
Transcript of Filament Winding Impregnation Study - University of Minnesota€¦ · Filament Winding Impregnation...
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Filament Winding Impregnation Study
David Cohen Susan C. Mantell
Toray Composites Department of Mechanical Engineering
University of Minnesota
ASC ANTEC, September 2001
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Problem Statement: What is Wet Winding?
Cylinder constructed by wrapping continuous fibers around a mandrel
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Impregnation Process during Winding
Fibers pass through a resin bath before winding
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Approach
2. Experiment Design
4. Interpret Results
1. Identify Key Variables resin flow front
w h
h f
Winding variables Tow properties
Which models are relevant? Which variables have significant effects?
3. Wind Samples
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Identify Key Variables
Lateral Flow Axial Flow
h
resin flow front
c
h f
Pressure Time Viscosity Porosity Permeability Tow height
Surface Tension Time Viscosity Permeability/ Channel width Tow height
c
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Experiment Design
Winding Speed -> Time Winding Tension -> Pressure, Tow height, Channel width Resin Temperature -> Viscosity Fiber Sizing Level -> Surface Tension Resin Content 3 Levels for Each Variable
28 Tests Total
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Quality Measures
Inner Tow Fiber Volume Fraction Void Volume Fraction
Between Band
Void Volume Fraction
Overall
Fiber Volume Fraction Void Volume Fraction
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Wind Samples
ω
54 in square mandrel (no compaction forces)
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Results: Void Fraction within the Band
Should be approximated by lateral flow model: Dimensionless parameters:
Winding speed Winding speed-Winding tension Resin Temperature
Significant effects
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Results: Void Fraction between Bands
Should be approximated by axial flow model: Dimensionless parameters:
Resin Temperature-Size Level Winding speed-Winding tension Winding tension
Significant effects
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Results: Deviation in Fiber Volume Fraction
Combination of slow winding speed, high winding tension and high resin content
Vf closest to desired value
ASC ANTEC 2001 September 11, 2001
University of Minnesota
Conclusions and Future Work
Conclusions ü DOE results indicate both axial and lateral flow occur
ü Significant effects Winding Speed Winding Tension Bath Temperature
Future Work
Models Tow dimensions Prepregging during wet winding h h f