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Authors: Farzad Sharifpour, Toby M. Bond, Anoush Poursartip

DOI: 10.33599/nasampe/s.23.0215

Abstract: Typically, 2D imaging techniques such as optical microscopy and scanning electron microscopy have been used to characterize carbon fibre-reinforced polymer (CFRP) microstructures. However, a proper understanding of CFRP microstructure benefits from 3D observation of the internal features, and synchrotron x-ray computed tomography (SRCT) has demonstrated the feasibility of capturing such microstructures at the needed resolution. From a processing perspective, this includes investigating the geometrical variability of prepreg fibre architectures including process-induced defects during cure, where simple 2D imaging fails to provide a complete picture. This research investigates the applicability of high-resolution SRCT (0.34–0.72 µm/voxel) in characterizing the microstructure of an interlayer-toughened CFRP. The Toray T800S/3900-2B material system was scanned and analyzed with particular attention to fibre-related parameters such as tortuosity and in-plane misalignment. Additionally, cure path dependent microstructures of the toughened interlayer were captured, and the significance of the particle shape on the interlayer thickness and fibre volume fraction was highlighted. The results are compared to previous 2D sectioning techniques, and the advantages and drawbacks of these techniques are discussed. This study advances the use of µCT to quantitatively characterize the change in prepreg microstructure due to processing, which in turn is key in understanding how mechanical properties change in the final cured part.

References: [1] F.C. Campbell, Manufacturing Processes for Advanced Composites. Oxford: Elsevier Advanced Technology, 2003. [2] K. Potter, Understanding the origins of defects and variability in composites manufacture. Proceeding of the 17th International Conferences on Composite Materials (ICCM 17), Edinburgh, UK, (2009) 1–19. [3] R. Talreja, Modelling defect severity for failure analysis of composites. In: W. Van Paepegem, editor. Multi-Scale Continuum Mechanics Modelling of Fibre-Reinforced Polymer Composites. Woodhead Publishing Series in Composites Science and Engineering; 2021. p. 275–306. [4] F. Sharifpour, J. Montesano, and R. Talreja, Assessing the effect of ply constraints on local stress states in cross-ply laminates containing manufacturing-induced defects. Composites Part B: Engineering 199 (2020) 108227, 1–13. [5] K. Potter, B. Khan, M. Wisnom, T. Bell, and J. Stevens, Variability, fibre waviness and misalignment in the determination of the properties of composite materials and structures. Composites Part A: Applied Science & Manufacturing 39 (2008) 9, 1343–1354. [6] H. Huang and R. Talreja, Effects of void geometry on elastic properties of unidirectional fiber reinforced composites. Composites Science & Technology 65 (2005) 13, 1964–1981. [7] M. Mehdikhani, L. Gorbatikh, Ignaas Verpoest, and S.V. Lomov, Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance. Journal of Composite Materials 53 (2019) 12, 1579–1669. [8] N. Zobeiry and A. Poursartip, The origins of residual stress and its evaluation in composite materials. In: P.W.R. Beaumont, C. Soutis, and A. Hodzic, editors. Structural Integrity and Durability of Advanced Composites: Innovative Modelling Methods and Intelligent Design. Woodhead Publishing Series in Composites Science and Engineering; 2015. p. 43–72. [9] A. L. Stewart and A. Poursartip, Characterization of fibre alignment in as-received aerospace grade unidirectional prepreg. Composites Part A: Applied Science & Manufacturing, 112 (2018) 239–249. [10] S. Herz, Experimental and analytical characterization of fibre alignment in composite materials, Dresden University of Technology, 2022. [11] D.H. O’Hare and M.W. Hyer, Effect of layer waviness on the compression strength of thermoplastic composite laminates. Journal of Reinforced Plastics and Composites 12 (1993) 4, 414–429. [12] A.M. Mrse and M.R. Piggott, Compressive properties of unidirectional carbon fibre laminates: II. The effects of unintentional and intentional fibre misalignments. Composites Science & Technology 46 (1993) 3, 219-227. [13] L.D. Bloom, J. Wang, and K.D. Potter, Damage progression and defect sensitivity: an experimental study of representative wrinkles in tension, Composites Part B: Engineering 45 (2013) 1, 449–458. [14] C. Cheng, A. Poursartip, and G. Fernlund, Cure-dependent microstructures and their effect on elastic properties of interlayer toughened thermoset composites. Composites Science & Technology 197 (2020) 108241, 1–11. [15] C. Cheng, S. Nesbitt, J. Reiner, R. Vaziri, A. Poursartip, and G. Fernlund, Cure path dependency of static and dynamic mode II interlaminar fracture toughness of interlayer toughened composite laminates. Composites Science & Technology 200 (2020) 108444, 1–13. [16] C. Cheng, A. Poursartip, and G. Fernlund, Influence of the glass transition of interlaminar particles on shear behaviour during cure of interlayer toughened thermoset composites. Composites Part A: Applied Science & Manufacturing 147 (2021) 106447, 1–12. [17] N.C.W. Judd and W.W. Wright, Voids and their effects on mechanical properties of composites–An appraisal. SAMPE Journal 14 (1978) 1, 10–14. [18] R.D. Adams and P. Cawley, A review of defect types and nondestructive testing techniques for composites and bonded joints. NDT International 21 (1988) 4, 208–222. [19] W.J. Cantwell and J. Morton, The significance of damage and defects and their detection in composite materials: a review. The Journal of Strain Analysis for Engineering Design 27 (1992) 1, 29–42. [20] E. Birt and R. Smith, A review of NDE methods for porosity measurement in fibre-reinforced polymer composites. Insight-Non-Destructive Testing and Condition Monitoring 46 (2004) 11, 681–686. [21] R. Prakash, Non-destructive testing of composites. Composites, 11 (1980) 4, 217–224. [22] J.E. Little, X. Yuan, and M.I. Jones, Characterisation of Voids in fibre reinforced composite materials. NDT & E International 46 (2012) 122–127. [23] S.W. Yurgartis, Measurement of small angle fiber misalignments in continuous fiber composites. Composites Science & Technology 30 (1987) 4, 279–293. [24] S. Hernández, F. Sket, J.M. Molina-Aldareguía, C. González, and J. LLorca, Effect of curing cycle on void distribution and interlaminar shear strength in polymer-matrix composites. Composites Science & Technology 71 (2011) 10, 1331–1341. [25] C.W. Dill, S.M. Tipton, E.H. Glaessgen, and K.D. Branscum, Fatigue strength reduction imposed by porosity in a fiberglass composite. In: J.E. Masters, editor. Damage detection in composite materials. ASTM International, 1992. DOI: 10.1520/STP14572S. [26] Y.K. Hamidi, L. Aktas, M.C. Altan, Three-dimensional features of void morphology in resin transfer molded composites. Composites Science & Technology 65 (2005) 7–8, 1306–1320. [27] Y. Nikishkov, L. Airoldi, and A. Makeev, Measurement of voids in composites by X-ray Computed Tomography. Composites Science & Technology 89 (2013), 89–97. [28] P. Yang and R. Elhajjar, Porosity content evaluation in carbon-fiber/epoxy composites using X-ray computed tomography. Polymer-Plastics Technology Engineering 53 (2014) 1, 217–222. [29] A.R. Chambers, J.S. Earl, C.A. Squires, and M.A. Suhot, The effect of voids on the flexural fatigue performance of unidirectional carbon fibre composites developed for wind turbine applications. International Journal of Fatigue 28 (2006) 10, 1389–1398. [30] C. Breite, A. Melnikov, A. Turon et al., Detailed experimental validation and benchmarking of six models for longitudinal tensile failure of unidirectional composites. Composite Structures 279 (2022) 114828, 1–19. [31] T. Takahashi, A. Todoroki, C. Kawamura et al., Unidirectional CFRP kinking under uniaxial compression modeled using synchrotron radiation computed tomography imaging. Composite Structures 289 (2022) 115458, 1–15. [32] M. Mehdikhani, C. Breite, Y. Swolfs, M. Wevers, S.V. Lomov, and L. Gorbatikh, Combining digital image correlation with X-ray computed tomography for characterization of fiber orientation in unidirectional composites, Composites Part A: Applied Science & Manufacturing 142 (2021) 106234, 1–15. [33] J. Castro, F. Sket, L. Helfen, and C. González, In situ local imaging and analysis of impregnation during liquid moulding of composite materials using synchrotron radiation computed laminography, Composites Science & Technology 215 (2021) 108999, 1–12. [34] S. Rosini, M.N. Mavrogordato, O. Egorova et al., In situ statistical measurement of local morphology in carbon-epoxy composites using synchrotron X-ray computed tomography, Composites Part A: Applied Science & Manufacturing 125 (2019) 105543, 1–14. [35] B. de Parscau du Plessix, P. Lefébure, N. Boyard et al., In situ real-time 3D observation of porosity growth during composite part curing by ultra-fast synchrotron X-ray, Journal of Composite Materials 53 (2019) 28–30, 4105–4116. [36] J. Vilà, F. Sket, F. Wilde et al., An in situ investigation of microscopic infusion and void transport during vacuum-assisted infiltration by means of X-ray computed tomography, Composites Science & Technology 119 (2015) 28–30, 12–19. [37] G. Requena, G. Fiedler, B. Seiser et al., 3D-Quantification of the distribution of continuous fibres in unidirectionally reinforced composites, Composites Part A: Applied Science & Manufacturing 40 (2009) 2, 152–163. [38] F.B. Salling, N. Jeppesen, M.R. Sonne, J.H. Hattel, and L.P. Mikkelsen, Individual fibre inclination segmentation from X-ray computed tomography using principal component analysis. Journal of Composite Materials 56 (2022) 1, 83–98. [39] P.J. Creveling, W.W. Whitacre, and M.W. Czabaj, A fiber-segmentation algorithm for composites imaged using X-ray microtomography: Development and validation, Composites Part A: Applied Science & Manufacturing 126 (2019) 105606, 1–13. [40] M.J. Emerson, K.M. Jespersen, A.B. Dahl, K. Conradsena, and L.P. Mikkelsen, A fiber-segmentation algorithm for composites imaged using X-ray microtomography: Development and validation, Composites Part A: Applied Science & Manufacturing 97 (2017), 83–92. [41] M.W. Czabaj, M.L. Riccio, and W.W. Whitacre, Numerical reconstruction of graphite/epoxy composite microstructure based on sub-micron resolution X-ray computed tomography, Composites Science & Technology 105 (2014), 174–182. [42] M.P.F. Sutcliffe, S.L. Lemanski, and A.E.Scott, Measurement of fibre waviness in industrial composite components, Composites Science & Technology 72 (2012) 16, 2016–2023. [43] S. Gray, S. Ganchev, N. Qaddoumi, G. Beauregard, D. Radford, and R. Zoughi, Porosity level estimation in polymer composites using microwaves. Material Evaluation 53 (1995) 3, 404–408. [44] F. Desplentere, S.V. Lomov, D.L. Woerdeman, I. Verpoest, M. Wevers, and A. Bogdanovich, Micro-CT characterization of variability in 3D textile architecture. Composites Science & Technology 65 (2005) 13,1920–1930. [45] K. Naresh, K.A. Khan, R. Umer, and W.J. Cantwell, The use of X-ray computed tomography for design and process modeling of aerospace composites: A review, Materials & Design 190 (2020) 108553, 1–31. [46] Y. Gao, W. Hu, S. Xin, and L. Sun, A review of applications of CT imaging on fiber reinforced composites, Journal of Composite Materials 56 (2022) 1, 133–164.[47] Toray Composite Materials America Inc, 3900 prepreg system Catalogue (2020). [48] Toray Composite Materials America Inc, T800S high tensile strength fiber catalogue (2018). [49] N. Odagiri, H. Kishi, M. Yamashita, Development of TORAYCA prepreg P2302 carbon fiber reinforced plastic for aircraft primary structural materials, Advanced Composite Materials 5 (1996) 249–254.[50] P.D. Lösel, T.van de Kamp, A. Jayme et al., Introducing Biomedisa as an open-source online platform for biomedical image segmentation, Nature Communications, 11 (2020) 5577, 1–14. [51] S. Matsuda, M. Hojo, S. Ochiai, Mesoscopic fracture mechanism of mode II delamination fatigue crack propagation in interlayer-toughened CFRP, Transactions of the Japan Society of Mechanical Engineers Series A, 63 (1997) 605 390–45.

Conference: SAMPE 2023

Publication Date: 2023/04/17

SKU: TP23-0000000215

Pages: 13

Price: $26.00

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