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Delamination Fracture Toughness Benefits of Inter-Woven Plies in Composite Laminates Produced through Automated Fibre Placement
Abstract:An automated fibre placement method has been developed to build through-thickness reinforcement into carbon fibre reinforced plastic laminates during their production, with the goal of increasing delamination fracture toughness while circumventing the additional costs and defects imposed by post-layup stitching and z-pinning. Termed ‘inter-weaving’, the method uses custom placement sequences of thermoset prepreg tows to distribute regular fibre link regions in traditionally clean ply interfaces. Inter-weaving’s impact on mode I delamination fracture toughness was evaluated experimentally through double cantilever beam tests (ASTM standard D5528-13) on [±15°]9 laminates made from Park Electrochemical Corp. E-752-LT 1/4” carbon fibre prepreg tape. Unwoven and inter-woven automated fibre placement samples were compared to those of traditional laminates produced from standard uni-directional plies of the same material system. Unwoven automated fibre placement laminates were found to suffer a mostly constant 3.5% decrease in mode I delamination fracture toughness compared to flat uni-directional plies. Inter-weaving caused significant local fracture toughness increases (up to 50%), though these were offset by a matching overall reduction. These positive and negative behaviours of inter-woven laminates were respectively found to be caused by fibre breakage and matrix deformation at inter-weave sites, and the 3D layering of inter-woven ply interfaces providing numerous paths of least resistance for crack propagation.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1474616Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 407
 R. P. Taylor, Fibre composite aircraft - capability and safety. Australian Transport Safety Bureau, 1 ed., 2008.
 Z. Aslan and F. Daricik, “Effects of multiple delaminations on the compressive, tensile, flexural, and buckling behaviour of e-glass/epoxy composites,” Composites Part B: Engineering, vol. 100, pp. 186–196, Sep. 2016.
 H. Chai, “The characterization of mode i delamination failure in non-woven, multidirectional laminates,” Composites, vol. 15, pp. 277–290, Oct. 1984.
 M. B. M. Rehan, J. Rousseau, S. Fontaine, and X. Gong, “Experimental study of the influence of ply orientation on DCB mode-i delamination behavior by using multidirectional fully isotropic carbon/epoxy laminates,” Composite Structures, vol. 161, pp. 1–7, Feb. 2017.
 J.-K. Kim and M.-L. Sham, “Impact and delamination failure of woven-fabric composites,” Composites Science and Technology, vol. 60, pp. 745–761, Apr. 2000.
 D. Nicholls and J. Gallagher, “Determination of GIC in angle ply composites using a cantilever beam test method,” Journal of Reinforced Plastics and Composites, vol. 2, pp. 2–17, Jan. 1983.
 I. Herszberg, M. K. Bannister, K. H. Leong, and P. J. Falzon, “Research in textile composites at the cooperative research centre for advanced composite structures,” Journal of the Textile Institute, vol. 88, pp. 52–73, Jan. 1997.
 A. Mouritz, K. Leong, and I. Herszberg, “A review of the effect of stitching on the in-plane mechanical properties of fibre-reinforced polymer composites,” Composites Part A: Applied Science and Manufacturing, vol. 28, pp. 979–991, Jan. 1997.
 K. Dransfield, C. Baillie, and Y.-W. Mai, “Improving the delamination resistance of CFRP by stitching—a review,” Composites Science and Technology, vol. 50, pp. 305–317, Jan. 1994.
 G. Stegschuster, K. Pingkarawat, B. Wendland, and A. Mouritz, “Experimental determination of the mode i delamination fracture and fatigue properties of thin 3d woven composites,” Composites Part A: Applied Science and Manufacturing, vol. 84, pp. 308–315, May. 2016.
 A. Mouritz, M. Bannister, P. Falzon, and K. Leong, “Review of applications for advanced three-dimensional fibre textile composites,” Composites Part A: Applied Science and Manufacturing, vol. 30, pp. 1445–1461, Dec. 1999.
 A. Mouritz and B. Cox, “A mechanistic interpretation of the comparative in-plane mechanical properties of 3d woven, stitched and pinned composites,” Composites Part A: Applied Science and Manufacturing, vol. 41, pp. 709–728, Jun. 2010.
 P. Robinson and D. Song, “A modified DCB specimen for mode i testing of multidirectional laminates,” Journal of Composite Materials, vol. 26, pp. 1554–1577, Nov. 1992.
 C. C. Poe, H. B. Dexter, and I. S. Raju, “Review of the NASA textile composites research,” Journal of Aircraft, vol. 36, pp. 876–884, Sep. 1999.
 J. Levy, “Delamination resistance of inter-woven composite plies produced through automated fibre placement,” tech. rep., UNSW Sydney, Feb. 2017.
 Park Electrochemical Corp., “E-752-LT CFRP Prepreg Material Datasheet,” Feb. 2015.
 “ASTM D5528-13 Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites,” standard, ASTM International, West Conshohocken, PA, Nov. 2013.