Abstract
This paper reports on the fracture behavior of MWCNT-reinforced cement paste based on evidence from three-point bending tests of single-edge notched beam samples. Digital image correlation (DIC) was used to measure full-field displacements at different stages of fracture in reinforced and unreinforced samples. Strain maps extracted from displacement data were used to characterize the morphology of the fracture process zone (FPZ). The DIC principal tensile strain maps from nanoreinforced samples consistently highlighted the development of a larger FPZ prior to failure. Evidence from scanning electron microscopy analysis of fracture surfaces further supports the hypothesis that highly-dispersed and well-bonded MWCNTs contribute to toughness through crack-bridging.
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Acknowledgements
The support of the University of South Carolina (USC) through a Promising Investigator Research Award (PIRA) to the third author, the State Center for Mechanics, Materials and Non-Destructive Evaluation, and the Magellan Program for undergraduate research is gratefully acknowledged. Special thanks are extended to: Ms. English Player (formerly undergraduate research assistant and USC Magellan mini-grantee), Prof. Navid Saleh and Mr. Nirupam Aich (formerly graduate student) for their assistance in processing of MWCNTs; and Prof. Michael Sutton, Prof. Anthony Reynolds, and Mr. Dan Wilhelm (USC Department of Mechanical Engineering) for their assistance in the use of the load test frame, CMOD sensor and DIC equipment. Correlated Solutions, Inc. (Columbia, SC) generously provided the Vic-3D v7 software used for the DIC analysis.
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© 2015 The Society for Experimental Mechanics, Inc.
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Zohhadi, N., Koohbor, B., Matta, F., Kidane, A. (2015). Characterization of Fracture Behavior of Multi-Walled Carbon Nanotube Reinforced Cement Paste Using Digital Image Correlation. In: Carroll, J., Daly, S. (eds) Fracture, Fatigue, Failure, and Damage Evolution, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06977-7_10
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DOI: https://doi.org/10.1007/978-3-319-06977-7_10
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