Experimental and Numerical Investigation of Rock Dynamic Fracture
Publish Year: 1396
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IJMGE-51-1_005
تاریخ نمایه سازی: 2 آبان 1396
Abstract:
Rapid development of engineering activities expands through a variety of rock engineering processes such as drilling, blasting, mining and mineral processing. These activities require rock dynamic fracture mechanics method to characterize the rock behavior. Dynamic fracture toughness is an important parameter for the analysis of engineering structures under dynamic loading. Several experimental methods are used for determination of dynamic fracture properties of materials. Among them, the Hopkinson pressure bar and the drop weight have been frequently used for rocks. On the other hand, numerical simulations are very useful in dynamic fracture studies. Among vast variety of numerical techniques, the powerful extended finite element method (XFEM) enriches the finite element approximation with appropriate functions extracted from the fracture mechanics solution around a crack-tip. The main advantage of XFEM is its capability in modeling different on a fixed mesh, which can be generated without considering the existence of discontinuities. In this paper, first, the design of a drop weight test setup is presented. Afterwards, the experimental tests on igneous (basalt) and calcareous (limestone) rocks with single-edge-cracked bend specimen are discussed. Then, each experimental test is modeled with the XFEM code. Finally, the obtained experimental and numerical results are compared. The results indicate that the experimentally predicted dynamic fracture toughness has less than 8 percent difference with calculated dynamic fracture toughness from extended finite element method
Keywords:
Rock fracture dynamic toughness , extended finite element method (XFEM) , three point bending test , drop weight setup
Authors
Aliasghar Mirmohammadlou
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
Hossein Memarian
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
Soheil Mohammadi
School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran
Mohammadamin jafari
School of Civil Engineering, College of Engineering, University of Torento, Torento, Canada