Title: Additive Manufacturing of Damage Tolerant Continuous Glass Fiber Reinforced Thermosets

Authors: Mohanad Idrees, Giuseppe R. Palmese, and Nicolas J. Alvarez

DOI: 10.33599/nasampe/s.22.0696

Abstract: Additive manufacturing (AM) offers significant advantages in the way of economics and material/shape flexibility. However, one primary drawback of AM technology is the difficulty in manufacturing fiber reinforced parts. We have recently developed an AM process for continuous glass fiber reinforced composites using a liquid crystal display (LCD) printer. The process allows for the inclusion of resin-rich layers (RRL) between plies to toughen the regions vulnerable to premature failure. This work aims to understand the effect of RRL properties and thickness on the interlaminar toughness of AM glass fiber laminates (i.e., Gic and Giic). We used a combination of microscopy and spectroscopy to investigate the failure process. Our results revealed that the resin used in the RRL significantly affected material properties. For example, we show that a brittle resin (DA2) in the RRL significantly compromised the interlaminar toughness due to microcracking. However, the use of a tough RRL (Tenacious) significantly increased Giic by ~90% and linearly improved the initiation Gic. The fractured surfaces were studied in detail, and the data suggests that the RRL laminate interface is critical for translating resin properties to the composite, thus improving laminate interlaminar toughness.

References: [1] P.K. Mallick, Fiber-Reinforced Composites, 3rd Editio, CRC Press, Boca Raton, 2007. https://doi.org/10.1201/9781420005981. [2] M.H. Nguyen, P. Davidson, A.M. Waas, Particle-toughened interlayers enhance mechanical response of composite laminates, Compos. Sci. Technol. 182 (2019) 107761. https://doi.org/10.1016/j.compscitech.2019.107761. [3] P. Compston, P.Y.B. Jar, P.J. Burchill, K. Takahashi, The transfer of matrix toughness to composite mode I interlaminar fracture toughness in glass-fibre/vinyl ester composites, Appl. Compos. Mater. 9 (2002) 291–314. https://doi.org/10.1023/A:1019658627639. [4] P. Compston, P.Y.B. Jar, P. Davies, Matrix effect on the static and dynamic interlaminar fracture toughness of glass-fibre marine composites, Compos. Part B Eng. 29 (1998) 505–516. https://doi.org/10.1016/S1359-8368(98)00004-3. [5] B. Beylergil, M. Tanoğlu, E. Aktaş, Experimental and statistical analysis of carbon fiber/epoxy composites interleaved with nylon 6,6 nonwoven fabric interlayers:, Https://Doi.Org/10.1177/0021998320927740. 54 (2020) 4173–4184. https://doi.org/10.1177/0021998320927740. [6] J. Jia, X. Du, C. Chen, X. Sun, Y.W. Mai, J.K. Kim, 3D network graphene interlayer for excellent interlaminar toughness and strength in fiber reinforced composites, Carbon N. Y. 95 (2015) 978–986. https://doi.org/10.1016/j.carbon.2015.09.001. [7] S. Matsuda, M. Hojo, S. Ochiai, A. Murakami, H. Akimoto, M. Ando, Effect of ionomer thickness on mode I interlaminar fracture toughness for ionomer toughened CFRP, Compos. Part A Appl. Sci. Manuf. 30 (1999) 1311–1319. https://doi.org/10.1016/S1359-835X(99)00023-8. [8] S. Singh, I.K. Partridge, Mixed-mode fracture in an interleaved carbon-fibre/epoxy composite, Compos. Sci. Technol. 55 (1995) 319–327. https://doi.org/10.1016/0266-3538(95)00062-3. [9] A. Aksoy, L.A. Carlsson, Interlaminar shear fracture of interleaved graphite/epoxy composites, Compos. Sci. Technol. 43 (1992) 55–69. https://doi.org/10.1016/0266-3538(92)90133-N. [10] M. Hojo, S. Matsuda, S. Ochiai, A. Murakami, H. Akimoto, M. Materials, The Role of Interleaf / Base Lamina Interphase in Toughening Mechanism of Interleaf-Toughened Cfrp, in: ICCM-12 Conf., 1999. [11] K. Bilge, S. Venkataraman, Y.Z. Menceloglu, M. Papila, Global and local nanofibrous interlayer toughened composites for higher in-plane strength, Compos. Part A Appl. Sci. Manuf. 58 (2014) 73–76. https://doi.org/10.1016/j.compositesa.2013.12.001. [12] H. Suemasu, H. Takahashi, T. Ishikawa, On failure mechanisms of composite laminates with an open hole subjected to compressive load, Compos. Sci. Technol. 66 (2006) 634–641. https://doi.org/10.1016/j.compscitech.2005.07.042. [13] J. Cugnoni, R. Amacher, S. Kohler, J. Brunner, E. Kramer, C. Dransfeld, W. Smith, K. Scobbie, L. Sorensen, J. Botsis, Towards aerospace grade thin-ply composites: Effect of ply thickness, fibre, matrix and interlayer toughening on strength and damage tolerance, Compos. Sci. Technol. 168 (2018) 467–477. https://doi.org/10.1016/j.compscitech.2018.08.037. [14] N. Sela, O. Ishai, L. Banks-Sills, The effect of adhesive thickness on interlaminar fracture toughness of interleaved cfrp specimens, Composites. 20 (1989) 257–264. https://doi.org/10.1016/0010-4361(89)90341-8. [15] M. Arai, Y. Noro, K. ichi Sugimoto, M. Endo, Mode I and mode II interlaminar fracture toughness of CFRP laminates toughened by carbon nanofiber interlayer, Compos. Sci. Technol. 68 (2008) 516–525. https://doi.org/10.1016/j.compscitech.2007.06.007. [16] S.U. Khan, J.K. Kim, Improved interlaminar shear properties of multiscale carbon fiber composites with bucky paper interleaves made from carbon nanofibers, Carbon N. Y. 50 (2012) 5265–5277. https://doi.org/10.1016/j.carbon.2012.07.011. [17] F. Ozdil, L.A. Carlsson, Plastic zone estimates in mode I interlaminar fracture of interleaved composites, Eng. Fract. Mech. 41 (1992) 645–658. https://doi.org/10.1016/0013-7944(92)90151-4. [18] J. Tu, K. Makarian, N.J. Alvarez, G.R. Palmese, Formulation of a Model Resin System for Benchmarking Processing-Property Relationships in High-Performance Photo 3D Printing Applications, Mater. 2020, Vol. 13, Page 4109. 13 (2020) 4109. https://doi.org/10.3390/MA13184109. [19] M. Idrees, A.M.H. Ibrahim, E. Tekerek, A. Kontsos, G.R. Palmese, N.J. Alvarez, The effect of resin-rich layers on mechanical properties of 3D printed woven fiber-reinforced composites, Compos. Part A Appl. Sci. Manuf. 144 (2021) 106339. https://doi.org/10.1016/j.compositesa.2021.106339. [20] M.S. Madhukar, L.T. Drzal, Fiber-Matrix Adhesion and Its Effect on Composite Mechanical Properties: IV. Mode I and Mode II Fracture Toughness of Graphite/Epoxy Composites, J. Compos. Mater. 26 (1992) 936–968. https://doi.org/10.1177/002199839202600701. [21] P. Compston, P.Y.B. Jar, P.J. Burchill, K. Takahashi, Effect of matrix toughness and loading rate on the mode-II interlaminar fracture toughness of glass-fibre/vinyl-ester composites, Compos. Sci. Technol. 61 (2001) 321–333. https://doi.org/10.1016/S0266-3538(00)00226-8.

Conference: SAMPE 2022

Publication Date: 2022/05/23

SKU: TP22-0000000696

Pages: 13

Price: $26.00