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

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3.0E+06 2.5E+06 2.0E+06 1.5E+06 1.0E+06 5.0E+05 0.0E+00 1400000 1200000 1000000 800000 600000 400000 200000 0 Resin Pressure (Pa) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Position along Flexbeam Length Figure 4.10. Estimated Resin Pressure Distribution at t=5 Minutes. Resin Pressure (Pa) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Flexbeam Length Position Figure 4.11. Estimated Resin Pressure Distribution at t=214 Minutes. 4.8 Model Output For Cure Process-- Suspected Origins Of Fiber Waviness The flexbeam model produced many indications that it was a representative model. Using the reasonably optimized S2/8552 flexbeam thermal cycle, it was noticed that until about 62
55 minutes into the S2/8552 cycle, there was no resin velocity in the center (with respect to length of the flexbeam). With the passage of simulated time, as the thermal contact was maintained over the two initial areas of contact, the contact areas increase in size, and the resin temperature gradually increases in the center regions, and with it the viscosity decreases, enabling resin flow across the entire length. For the S2/8552 flexbeam during the cure process 5 minutes before the point in time when the tool lid will make contact with the entire laminate surface, Figure 4.12 portrays the distribution of resin pressure along the flexbeam length. The model portrays the twin peaks of resin pressure emanating from the contact areas between the lid and the laminate. Figure 4.13 displays the resin pressure distribution at the time of full contact being achieved. Resin Pressure (Pa) 1.2E+06 1.0E+06 8.0E+05 6.0E+05 4.0E+05 2.0E+05 0.0E+00 1 3 5 7 9 11 13 15 17 19 21 23 25 Position along Flexbeam Length Figure 4.12. Resin Pressure Distribution Just Before the Time of Full Lid/Laminate Contact. 63
Page 1 and 2:
PROCESS MODELING SYSTEM FOR PRESS C
Page 3 and 4:
ACKNOWLEDGEMENTS This dissertation
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TABLE OF CONTENTS ACKNOWLEDGEMENTS
Page 7 and 8:
4. RESULTS ........................
Page 9 and 10:
4.7 Acceptable IM7/3501-6 Flexbeam
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: Flexbeam (z) Height and Tool Lid Po
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.,
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TOOLED THICK COMPOSITES by ARVEN H. SAUNDERS III ...

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