TOOLED THICK COMPOSITES by ARVEN H. SAUNDERS III ...

More documents

Recommendations

Info

LIST OF ILLUSTRATIONS Figure Page 1.1 Overall Cure Process ............................................................................................................... 1 1.2 Schematic Representation of Thickness for a Typical Thick Laminate (side or through thickness view) ..................................................................... 4 1.3 Fiber/Layer Waviness in a Section of a Thick S2/8552 Composite Laminate .................................................................................................. 5 2.1 A Typical Bond Press Cure Cycle ............................................................................................ 8 3.1 Generic Flexbeam with Tooling Model ................................................................................... 23 3.2 Consolidation of a Flat Laminate with Pressure Applied <strong>by</strong> a Rigid Surface .................................................................................................... 28 3.3 Permeability as a Function of Fiber Volume Fraction. ........................................................... 29 3.4 Effective or Fiber Bed Stress vs. Fiber Volume Fraction. ...................................................... 31 3.5 Flat Laminate Model Constant Displacement Rate and Position Hold. ................................. 34 3.6 Flat Laminate Model Constant Pressure Dwell ...................................................................... 35 3.7 Flat Laminate Model Constant Pressure Dwell with Permeability as a Function of Vf. ................................................................................... 36 3.8 Model Control Volumes and Nodes Representing a Simple Flat Laminate.. ................................................................................. 37 3.9 Flow Resistance Network Representing the Laminate. ......................................................... 42 4.1 Lengthwise View of Tool Lid (red) Contact with Flexbeam (blue).. ........................................ 51 4.2 Progressive Lid Contact with Laminate ................................................................................. 52 4.3 Conventional Approach using Two Temperature Dwells ...................................................... 54 4.4 Second Attempt at Thermal Cycle Using Multiple Dwells ..................................................... 55 4.5 Application of Self-Directed Temperature Control using Estimated Future Cure Rate ........................................................................................ 56 4.6 Acceptable S2/8552 Flexbeam Temperature Cycle ............................................................. 57 viii
4.7 Acceptable IM7/3501-6 Flexbeam Temperature Cycle ........................................................ 58 4.8 S2/8552 Flexbeam Cure Process with Pressure Application ............................................... 59 4.9 Initial Lid/Laminate Contact. .................................................................................................. 61 4.10 Estimated Resin Pressure Distribution at t=5 Minutes.......................................................... 62 4.11 Estimated Resin Pressure Distribution at t=214 Minutes.. ................................................... 62 4.12 Resin Pressure Distribution Just Before the Time of Full Lid/Laminate Contact ..................................................................................................... 63 4.13 Resin Pressure Distribution With Respect To Flexbeam Length At Time Of Full Contact Being Achieved .................................................................. 64 4.14 Resin Pressure Distribution at the Time of Full Contact.. ..................................................... 65 4.15 Resin Pressure Distribution 5 Minutes After Time of Full Contact.. ...................................... 66 4.16 Resin Flow Patterns Indicating Collisions.. ........................................................................... 67 4.17 Resin Pressure Distribution Along Laminate Length For 3501-6 Flexbeam 5 Minutes Before Full Contact.. ............................................................................ 67 4.18 Resin Pressure Distribution At Time Of Full Contact.. .......................................................... 68 4.19 Resin Flow Patterns Indicating Collisions.. ........................................................................... 68 ix
Page 1 and 2: PROCESS MODELING SYSTEM FOR PRESS C
Page 3 and 4: ACKNOWLEDGEMENTS This dissertation
Page 5 and 6: TABLE OF CONTENTS ACKNOWLEDGEMENTS
Page 7: 4. RESULTS ........................
Page 11 and 12: CHAPTER 1 INTRODUCTION 1.1 Backgrou
Page 13 and 14: Inspection and evaluation technique
Page 15 and 16: Figure 1.3. Fiber/Layer Waviness in
Page 17 and 18: CHAPTER 2 REVIEW OF RELATED RESEARC
Page 19 and 20: greatly lag in temperature. As a re
Page 21 and 22: Physics-based models are often used
Page 23 and 24: equation above can be solved by wri
Page 25 and 26: keep the cure on track. Examples of
Page 27 and 28: (Chen, 2002). However, because they
Page 29 and 30: during cure and consolidation. In a
Page 31 and 32: initially in the cure process but w
Page 33 and 34: Figure 3.1. Generic Flexbeam with T
Page 35 and 36: Permeability describes the resistan
Page 37 and 38: patterns velocity and timing during
Page 39 and 40: S ii 2 f r = 4k ii ( 1− V where r
Page 41 and 42: proportion of the applied pressure
Page 43 and 44: At any timestep in the simulation,
Page 45 and 46: constant displacement ramp followed
Page 47 and 48: 6 5 4 3 2 1 0 Figure 3.8. Model Con
Page 49 and 50: decrease for CVs that were previous
Page 51 and 52: total resin volume rate for the lam
Page 53 and 54: series electrical circuits—a left
Page 55 and 56: hold these values, with R(k) being
Page 57 and 58: • Resin pressure causes resin flo
Page 59 and 60:
where α is cure, An is the pre-exp
Page 61 and 62:
temperature conditions. The princip
Page 63 and 64:
cycle. The ability to optimize temp
Page 65 and 66:
Temperature (C) 200 180 160 140 120
Page 67 and 68:
Temperature (C) 200 180 160 140 120
Page 69 and 70:
useful; as pointed out by Cirisciol
Page 71 and 72:
Flexbeam (z) Height and Tool Lid Po
Page 73 and 74:
55 minutes into the S2/8552 cycle,
Page 75 and 76:
Resin Pressure (Pa) 1.2E+06 1.0E+06
Page 77 and 78:
-7.138E-12 -7.138E-12 -6.517E-12 -5
Page 79 and 80:
keeping the level below a certain t
Page 81 and 82:
feedback to set the temperature cur
Page 83 and 84:
(Chen, 2002) Chen, Y., "Modeling of
Page 85 and 86:
(Mitra, 2009) Mitra, K., Majumder,
Page 87 and 88:
(Walia, 2006) Walia, R., Shan, H.,
show all

TOOLED THICK COMPOSITES by ARVEN H. SAUNDERS III ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?