Title: Data-Driven Digital Twins of Nano and Micro Composite Interfacial Failure

Authors: Mitesh H. Patadia, Mehul J. Tank, Ana V. De Leon, Rebekah D. Sweat

DOI: 10.33599/nasampe/s.22.0739

Abstract: Interfacial characteristics between matrix and reinforcement in composites drive the performance of the final part and dictate not only how fracture will initiate but also how failure will propagate. The interface and interphase in this study include carbon nanotubes (CNTs), carbon fibers, and thermosetting resin. The interfacial failure propagation in these composites is studied through a virtual testing simulation, where a fiber bundle pullout test is digitized. Modeling advancements have enabled accurate microstructures of the composite, including the interface, to be incorporated into simulations. A fiber bundle pullout (FBPO) test was modeled using finite element analysis with automatic crack insertion and cohesive zones for the interface between the fiber bundle and the surrounding resin. Length scale effects seen experimentally of nano (CNT) and micro (carbon fiber) inclusions were modeled as interface strength changes demonstrated through laboratory testing. CNT yarn and IM7 carbon fiber are both carbon-based. The nano vs. micro material effective interface shows vastly different strengths, modeled through varied inputs of the elastic and cohesive zone strength definitions with cracking criteria. Digital twin investigation of multiple variables identifies vital interfacial characteristics. It can improve composites' structural performance through material selection and local stress information based on inclusion type and location in the composite. Similar to experimental results, the simulation also showed the inverse relationship between the interfacial shear strength (IFSS) and embedded length for CNT yarn and IM7 fiber cases. The crack propagation and localized stresses were successfully monitored through post-analysis of the simulation. Cracks were observed to propagate from the bottom up to the top of the resin area in the direction of the force. The internal stresses at the fiber interface spread into the resin bulk area at a more considerable distance than the fiber's diameter. Factorial design and analysis of variance (ANOVA) revealed the factors affecting the IFSS of the system.

References: [1] A. B. Nair and R. Joseph, ""9 - Eco-friendly bio-composites using natural rubber (NR) matrices and natural fiber reinforcements,"" in Chemistry, Manufacture and Applications of Natural Rubber, S. Kohjiya and Y. Ikeda, Eds. Woodhead Publishing, 2014, pp. 249–283. doi: 10.1533/9780857096913.2.249. [2] D. Rajak, D. Pagar, P. Menezes, and E. Linul, ""Fiber-Reinforced Polymer Composites: Manufacturing, Properties, and Applications,"" Polymers, vol. 11, no. 10, p. 1667, Oct. 2019, doi: 10.3390/polym11101667. [3] S. Zhandarov, E. Mäder, C. Scheffler, G. Kalinka, C. Poitzsch, and S. Fliescher, ""Investigation of interfacial strength parameters in polymer matrix composites: Compatibility and reproducibility,"" Advanced Industrial and Engineering Polymer Research, vol. 1, no. 1, pp. 82–92, 2018, doi: 10.1016/j.aiepr.2018.06.002. [4] Y. Jia, W. Yan, and H.-Y. Liu, ""Carbon fibre pullout under the influence of residual thermal stresses in polymer matrix composites,"" Computational Materials Science, vol. 62, pp. 79–86, Sep. 2012, doi: 10.1016/j.commatsci.2012.05.019. [5] Q.-S. Yang and X. Liu, ""13 - Mechanical behavior of extra-strong CNT fibers and their composites,"" in Toughening Mechanisms in Composite Materials, Q. Qin and J. Ye, Eds. Woodhead Publishing, 2015, pp. 339–372. doi: 10.1016/B978-1-78242-279-2.00013-5. [6] M. J. Lodeiro, S. Maudgal, L. N. McCartney, R. Morrell, and B. Roebuck, ""Critical Review of Interface Testing Methods for Composites,"" p. 36. [7] S. Zhandarov, ""Characterization of fiber/matrix interface strength: applicability of different tests, approaches and parameters,"" Composites Science and Technology, vol. 65, no. 1, pp. 149–160, Jan. 2005, doi: 10.1016/j.compscitech.2004.07.003. [8] S. Huang, Q. Fu, L. Yan, and B. Kasal, ""Characterization of interfacial properties between fibre and polymer matrix in composite materials – A critical review,"" Journal of Materials Research and Technology, vol. 13, pp. 1441–1484, Jul. 2021, doi: 10.1016/j.jmrt.2021.05.076. [9] J.-W. Kim et al., ""Modifying carbon nanotube fibers: A study relating apparent interfacial shear strength and failure mode,"" Carbon, vol. 173, pp. 857–869, Mar. 2021, doi: 10.1016/j.carbon.2020.11.055. [10] G. Pandey, C. H. Kareliya, and R. P. Singh, ""A study of the effect of experimental test parameters on data scatter in microbond testing,"" Journal of Composite Materials, vol. 46, no. 3, pp. 275–284, Feb. 2012, doi: 10.1177/0021998311410508. [11] Y.-S. Dessureault et al., ""Tensile performance and failure modes of continuous carbon nanotube yarns for composite applications,"" Materials Science and Engineering: A, vol. 792, p. 139824, Aug. 2020, doi: 10.1016/j.msea.2020.139824. [12] S. Zhandarov, C. Scheffler, E. Mäder, and U. Gohs, ""Three Specimen Geometries and Three Methods of Data Evaluation in Single-Fiber Pullout Tests,"" Mech Compos Mater, vol. 55, no. 1, pp. 69–84, Mar. 2019, doi: 10.1007/s11029-019-09793-1. [13] J. D. Achenbach and H. Zhu, ""Effect of interfacial zone on mechanical behavior and failure of fiber-reinforced composites,"" Journal of the Mechanics and Physics of Solids, vol. 37, no. 3, pp. 381–393, Jan. 1989, doi: 10.1016/0022-5096(89)90005-7. [14] S. Zhandarov, E. Pisanova, E. Mäder, and J. A. Nairn, ""Investigation of load transfer between the fiber and the matrix in pullout tests with fibers having different diameters,"" Journal of Adhesion Science and Technology, vol. 15, no. 2, pp. 205–222, Jan. 2001, doi: 10.1163/156856101743418. [15] Ikramullah et al., ""Evaluation of Interfacial Fracture Toughness and Interfacial Shear Strength of Typha Spp. Fiber/Polymer Composite by Double Shear Test Method,"" Materials, vol. 12, no. 14, p. 2225, Jul. 2019, doi: 10.3390/ma12142225. [16] R. J. Day and J. V. C. Rodrigez, ""Investigation of the micromechanics of the microbond test,"" Composites Science and Technology, vol. 58, no. 6, pp. 907–914, Jan. 1998, doi: 10.1016/S0266-3538(97)00197-8. [17] Yu. A. Gorbatkina, V. G. Ivanova-Mumzhieva, and A. Ya. Gorenberg, ""Adhesive strength of bonds of polymers with carbon fibres at different loading rates,"" Fibre Chem, vol. 31, no. 5, pp. 405–409, Sep. 1999, doi: 10.1007/BF02364376. [18] K. G. Dassios, ""A Review of the Pullout Mechanism in the Fracture of Brittle-Matrix Fibre-Reinforced Composites,"" Advanced Composites Letters, vol. 16, no. 1, p. 096369350701600, Jan. 2007, doi: 10.1177/096369350701600102.

Conference: SAMPE 2022

Publication Date: 2022/05/23

SKU: TP22-0000000739

Pages: 16

Price: $32.00