Structural Engineering and Mechanics

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Experimental and numerical analysis of mixed mode I/III fracture of sandstone using three-point bending specimens

  • Li, Yifan (Department of Mechanical Engineering, University of Bristol, Queens Building, University Walk) ;
  • Dong, Shiming (College of Architecture and Environment, Sichuan University) ;
  • Pavier, Martyn J. (Department of Mechanical Engineering, University of Bristol, Queens Building, University Walk)
  • Received : 2020.05.08
  • Accepted : 2020.08.13
  • Published : 2020.12.25
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Abstract

In this work the mixed mode I/III fracture of sandstone has been studied experimentally and numerically. The experimental work used three-point bending specimens containing pre-existing cracks, machined at various inclination angles so as to achieve varying proportions of mode I to mode III loading. Dimensionless stress intensity factors were calculated using the extended finite element method (XFEM) for and compared with existing results from literature calculated using conventional finite element method. A total of 28 samples were used to conduct the fracture test with 4 specimens for each of 7 different inclination angles. The fracture load and the geometry of the fracture surface were obtained for different mode mixities. Prediction of the fracture loads and the geometry of the fracture surface were made using XFEM coupled with a cohesive zone model (CZM) and showed a good comparison with the experimental results.

Keywords

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