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Computers and Concrete Volume 22, Number 4, October 2018 , pages 373-381 DOI: https://doi.org/10.12989/cac.2018.22.4.373 |
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The effect of ball size on the hollow center cracked disc (HCCD) in Brazilian test |
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Hadi Haeri, Vahab Sarfarazi, Zheming Zhu and Masih Moradizadeh
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| Abstract | ||
| Hollow center cracked disc (HCCD) in Brazilian test was modelled numerically to study the crack propagation in the pre-cracked disc. The pre-existing edge cracks in the disc models were considered to investigate the crack propagation and coalescence paths within the modelled samples. The effect of particle size on the hollow center cracked disc (HCCD) in Brazilian test were considered too. The results shows that Failure pattern is constant by increasing the ball diameter. Tensile cracks are dominant mode of failure. These crack initiates from notch tip, propagate parallel to loading axis and coalescence with upper model boundary. Number of cracks increase by decreasing the ball diameter. Also, tensile fracture toughness was decreased with increasing the particle size. In this research, it is tried to improve the understanding of the crack propagation and crack coalescence phenomena in brittle materials which is of paramount importance in the stability analyses of rock and concrete structures, such as the underground openings, rock slopes and tunnel construction. | ||
| Key Words | ||
| SENRBB test; pre-existing edge cracks; PFC3D | ||
| Address | ||
| Hadi Haeri: College of Architecture and Environment, Sichuan University, Chengdu 610065, China Vahab Sarfarazi: Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran Zheming Zhu: College of Architecture and Environment, Sichuan University, Chengdu 610065, China Masih Moradizadeh: Department of Structural and Engineering Geology, School of Geology, College of Science, University of Tehran, Iran | ||