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TECHNICAL PAPERS

Ideal Forming Analysis for Random Fiber Preforms

[+] Author and Article Information
Richard B. Dessenberger, Charles L. Tucker

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

J. Manuf. Sci. Eng 125(1), 146-153 (Mar 04, 2003) (8 pages) doi:10.1115/1.1536658 History: Received August 01, 2001; Revised June 01, 2002; Online March 04, 2003
Copyright © 2003 by ASME
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References

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Parnas, R. S., 2000, Liquid Composite Molding, Hanser, Munich.
Bakharev,  A. S., and Tucker,  C. L., 1996, “Predicting the Effect of Preforming on RTM Mold Filling,” SPE Tech. Pap., 42, pp. 797–801.
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Figures

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Initial and final shape of the fiber sheet, and the coordinates used in the analysis
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Qualitative forming limit diagram, showing regions of acceptable deformation, wrinkling, and tearing
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Contour plot of the formability function W for U750 random-fiber mat, Eqs. (10111213), with α=100. The maximum contour shown is W=0.10.W developed from data at 200°C and 0.0125/s. Points indicate calculated results for the hat preform, using a free outer edge (circles) and a fixed outer edge with r=1.22 (squares)
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Finite element mesh of a hat preform
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Plot of the stretch ratios (λ12) and the formability function W (α=0) for the hat preform, using a free outer edge. The (λ12) pairs are also plotted as circles in Fig. 3.
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Plot of the sketch ratios (λ12) and the formability function W (α=0) for the hat preform, using a fixed outer edge with initial radius=1.22. The (λ12) pairs are also plotted as squares in Fig. 3.
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Contour plot of the formability function over the tool surface for the box with flange. Wrinkles are predicted in the indicated areas.
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Initial sheet of fibers required to produce the optimal preform for the box with flange
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Value of the penalty parameter α and the number of elements containing defects, for the box with flange

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