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GAS TRANSPORT AND WATER VAPOURIZATION IN out of autoclave prepreg laminates
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GAS TRANSPORT AND WATER VAPOURIZATION IN out of autoclave prepreg laminates ABSTRACT ........................................................................................................... ii TABLE CONTENTS ............................................................................................. iv LIST OF TABLES ................................................................................................ vii LIST OF FIGURES ............................................................................................. viii ACKNOWLEDGEMENTS ................................................................................... xv 1 INTRODUCTION ............................................................................................ 1 1.1 COMPOSITES PROCESSING ................................................................ 2 1.1.1 Autoclave and VBO Processing ........................................................ 5 1.2 OUT-OF-AUTOCLAVE PREPREG: CYCOM 5320/T650 ......................... 9 1.3 OBJECTIVES ......................................................................................... 10 2 LITERATURE REVIEW ................................................................................ 13 2.1 GAS TRANSPORT ................................................................................ 13 2.2 PERMEABILITY ..................................................................................... 16 2.2.1 Application of Darcy’s Law .............................................................. 20 2.3 MICROSCOPY ....................................................................................... 25 2.4 WATER VAPOURIZATION .................................................................... 29 2.4.1 Application of Kardos’ Solubility Model ............................................ 31 2.4.2 Application of Clausius-Clapeyron Equation ................................... 32 2.4.3 Application of Langmuir Evaporation Equation ................................ 34 v 3 PERMEABILITY TESTING ........................................................................... 36 3.1 METHODS ............................................................................................. 36 3.1.1 In-Plane Setup ................................................................................ 38 3.1.2 Long Debulk Setup .......................................................................... 44 3.1.3 Through-Thickness.......................................................................... 45 3.1.4 Microscopy ...................................................................................... 48 3.2 RESULTS ............................................................................................... 54 3.2.1 In-Plane Results .............................................................................. 54 3.2.2 Long Debulk Results ....................................................................... 56 3.2.3 Through-Thickness Results ............................................................. 58 3.2.4 Microscopy Results ......................................................................... 61 4 WATER VAPOURIZATION TESTING .......................................................... 70 4.1 METHODS ............................................................................................. 70 4.1.1 Humidity Conditioning Test ............................................................. 73 4.1.2 Water Vapourization Test ................................................................ 75 4.1.3 Vacuum Bagged Water Vapourization Test .................................... 78 4.2 RESULTS ............................................................................................... 81 4.2.1 Humidity Conditioning Results ........................................................ 81 4.2.2 Water Vapourization Results ........................................................... 85 4.2.3 Vacuum Bagged Water Vapourization Results ............................... 92 vi 5 DISCUSSION ............................................................................................... 96 5.1 Anisotropy of Gas Transport .................................................................. 96 5.2 Evolution of Gas Transport with Process History ................................... 99 5.3 Effect of Humidity on Moisture Content ................................................ 102 5.4 Water Vapour Flow Measurements with Mass Flow Sensors .............. 104 5.5 Timescales for Moisture Removal ........................................................ 105 5.6 Water Vapourization During VBO Processing ...................................... 107 6 CONCLUSION ............................................................................................ 112 6.1 Future Work ......................................................................................... 116 REFERENCES ................................................................................................. 119 APPENDICES ................................................................................................... 131 A) Derivation of Modified Darcy’s Law ...................................................... 131 B) Verification of Laminar Flow ................................................................. 133 C) Total System Leak Test........................................................................ 135 D) Inter-Chamber Leak Test, Transverse Gas Flow, and Air-Channel Bridging ................................................................................................ 136 E) Procedure for Initial Moisture Conditioning Trial ................................... 138 F) Flow Calibration Calculation ................................................................. 141 G) Vacuum Bagged Water Vapourization Leak Test ................................. 142 |
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