Application of Adelaide University Snapback Indirect Tensile test (AUSBIT) on 3D Printed Cement-based Materials Z. Huang1,∗, W. Yang1, R. Verma1, G. D. Nguyen1, T. T. Tung2, M. Karakus2 1 School of Architecture and Civil Engineering, University of Adelaide, Adelaide 5000, Australia 2 School of Chemical Engineering, University of Adelaide, Adelaide 5000, Australia ∗ zili.huang@adelaide.edu.au Keywords: 3D printing, Brazilian disc, indirect tension; fracture; snap-back, interlayer bond strength, layer orientation. Additive manufacturing (AM), known as three-dimensional (3D) printing, is an innovative technology that has found applications in the construction industry [1-2]. Due to the intrinsic layerby-layer manufacturing process, interlayer bond strength is a key that needs to be investigated and improved, to ensure the reliability and suitability of the technology. In fracture tests, the orientation of the layers and their interfaces strongly affect the responses and hence stability of the tests. Fracture can happen very abruptly and hence can be out of control due to weak interfaces between layers, particularly in indirect tensile tests on disc specimens. In this study, the use of AUSBIT (Adelaide University Snapback Indirect Tensile test [4-6]) facilitates the investigation of pre- and post-peak behaviour of the 3D printed disc specimens thanks to its ability to stabilize the cracking process in Brazilian disc testing. This prevents abrupt or instant failure of disc specimens and hence can allow more time for the use of advanced image-based instrumentation. In combination with AUSBIT, Digital Image Correlation (DIC, [7, 8]) enables observation of full-field strain distributions and their evolutions during fracturing process. References [1] Hamidi, F., Aslani, F. (2019). Additive manufacturing of cementitious composites: Materials, methods, potentials, and challenges. Construction and Building Materials, 281, 582-609. [2] Tay, Y., Panda, B., Paul, S., Mohamed, N., Tan, M., Leong, K. (2017). 3D printing trends in building and construction industry: a review. Virtual and Physical Phototyping, 12, 261-276. [3] Wu, P., Wang, J., Wang, X. (2016). A critical review of the use of 3-D printing in the construction industry. Automation in Construction, 68, 21-31. [4] Verma, R., Nguyen, G., Karakus, M. (2019a). Snap back indirect tensile test (AUSBIT) Patent, IP Australia 2019101006. [5] Verma, R., Nguyen, G., Karakus, M., Taheri, A. (2021a). AUSBIT: A novel approach to capturing snapback in indirect tensile testing, proceeding of 55th US Rock Mechanics/Geomechanics Symposium OnePetro. [6] Verma, R., Nguyen, G., Karakus, M., Taheri, A. (2021b). Capturing snapback in indirect tensile testing using AUSBIT - Adelaide University Snap-Back Indirect Tensile test. International Journal of Rock Mechanics and Mining Sciences (Oxford, England: 1997) 147, 104897-. [7] Chu, T., Ranson, W., Sutton, M. (1985). Applications of digital-image-correlation techniques to experimental mechanics. Experimental Mechanics, 25, no. 3, 232-244. [8] Correlation Solutions. (2009). Vic-2D Reference Manual, pp. 1-59. 111
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