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Microstructural Evaluation of Aligned, Short Fiber TUFF Material


Title: Microstructural Evaluation of Aligned, Short Fiber TUFF Material

Authors: Dirk Heider, John Tierney, Mohamed A. Henchir, Verena Gargitter, Shridhar Yarlagadda, John W. Gillespie Jr., Jessica Sun, Jennifer M. Sietins, and Dan Knorr

DOI: 10.33599/nasampe/s.19.1609

Abstract: The Tailorable Universal Feedstock for Forming (TuFF) material is comprised of highly aligned discontinuous fibers that achieves a high level of mechanical properties with large in-plane extensibility for forming of complex geometries. The paper characterizes the TuFF microstructure in terms of areal weight and fiber volume fraction and statistical distributions of fiber length, fiber-fiber spacing and fiber alignment using microscopy and X-ray Computed-Tomography with custom developed algorithms for data reduction. The TuFF program has demonstrated full property translation of stiffness and strength compared to continuous prepreg (60% fiber volume fraction) when 95% of all fibers are aligned within 5° and have a minimum fiber aspect ratio (length over diameter) of 600.

References: 1. T. Gutowski, G. Dillon “The Elastic Deformation of Lubricated Carbon Fiber Bundles: Comparison Of Theory And Experiments.” Journal of Composite Materials 26(1992):2330–2247. 2. J. L. Kardos, “Critical issues in achieving desirable mechanical properties for short fibre composites” Pure Applied Chemistry, 57 (11) 1651–1657, 1985 3. H. Fukuda and T.-W. Chou “A probabilistic theory of the strength of short-fibre composites with variable fibre length and orientation” J Materials Sci., 17(4) 1003–1011, 1982 4. R. Mao “Complex moduli of aligned-short-fibre reinforced composites” Compos. Sci. Technol., 36(3) 211–225, 1989 5. C. L. Tucker III and E. Liang “Stiffness predictions for unidirectional short-fibre composites: review and evaluation” Compos. Sci. Technol., 59(5) 655–671, 1999 6. J. Schuster, K. Friedrich, “Modeling of the mechanical properties of discontinuous-aligned-fiber composites after thermoforming”, Composites Science and Technology, Volume 57, Issue 4, 1997, Pages 405-413. 7. J. W. Gillespie , J. Deitzel, D. Heider, J. Tierney, and S. Yarlagadda, “Tailorable Universal Feedstock for Forming: Overview and Performance ”, SAMPE Conference Proceedings. Charlotte, NC, May 20-23, 2019. 8. P. Šimáček, S. G. Advani, “A micromechanics model to predict extensional viscosity of aligned long discontinuous fiber suspensions”, International Journal of Material Forming, 2018. 9. D. Zhang, D. Heider, J.W. Gillespie, Jr., “Determination of void statistics and statistical representative volume elements in carbon fiber-reinforced thermoplastic prepregs”, Journal of Thermoplastic Composite Materials, 2015. 10. J. M. Sietins, D. B. Knorr, Jr., J. C. Sun, ”Fiber Alignment Evaluation Through X-Ray Computed Tomography”, SAMPE Conference Proceedings. Charlotte, NC, May 20-23, 2019. 11. 12. Andrew L. Stewart, Anoush Poursartip, “Characterization of fibre alignment in as-received aerospace grade unidirectional prepreg”, Composites Part A 112 (2018) 239–249.

Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1609

Pages: 11

Price: FREE

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