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Experimental and numerical investigation of the center-cracked horseshoe disk method for determining the mode I fracture toughness of rock-like material

Haeri, H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s00603-017-1310-3
  3. Abstract:
  4. This paper presents a new procedure for determining the fracture toughness of rock-like specimens using the diametric compression test with the center-cracked horseshoe disk (CCHD) method. Using finite element analysis, a dimensionless stress intensity factor was obtained and a formula was rendered for determining mode I fracture toughness. To evaluate the accuracy of the measurement results produced by the CCHD method, fracture toughness experiments were conducted on the same rock-like material using the notched Brazilian disk (NBD) method. The CCHD tests were simulated using a two-dimensional particle flow code for validation of the experimental results, and a great agreement between the pattern of crack initiation and propagation between the experimental and numerical simulations was observed. Lower values of fracture toughness were obtained from CCHD experiments than NBD tests due to purely tensile stress distribution at the tip of the existing notch in CCHD method. © 2017, Springer-Verlag GmbH Austria
  5. Keywords:
  6. Stress intensity factor ; Compression testing ; Cracks ; Finite element method ; Numerical methods ; Stress intensity factors ; Center-cracked horseshoe disk ; Crack initiation and propagation ; Diametric compression ; Dimensionless stress intensity factors ; Mode-i fracture toughness ; Numerical investigations ; PFC2D ; Rock like materials ; Compression ; Crack propagation ; Experimental study ; Finite element method ; Fracture toughness ; Measurement method ; Model validation ; Numerical method ; Rock mechanics ; Tensile stress ; Two-dimensional modeling
  7. Source: Rock Mechanics and Rock Engineering ; Volume 51, Issue 1 , 2018 , Pages 173-185 ; 07232632 (ISSN)
  8. URL: https://link.springer.com/article/10.1007/s00603-017-1310-3