Experimental and numerical investigation of the punch-through shear test for mode II fracture toughness determination in rock. (15th October 2017)

• Record Type: Journal Article
• Authors: Wu, Haoyan; Kemeny, John; Wu, Shunchuan
• Is Part Of: Engineering fracture mechanics. Volume 184(2017)
• Page Start: 59
• Page End: 74
• Publication Date: 2017-10-15
• Subjects: Punch-through shear test -- Mode II fracture toughness -- PFC3D -- Acoustic emission; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2017.08.006
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Three dimensional PFC was used to simulate the process of punch-through shear test. 9 confining pressures ranging from 0.1 to 80 MPa were tested in numerical simulation. Multiple methods were used to present special and temporal evolution of fractures. Abstract: The punch through shear test is a laboratory test used to determine the shear fracture toughness K IIC in rock. In this paper, the punch-through shear test was simulated using a discrete element particle model, and the dependence of K IIC on loading velocity and confinement ranging from 0.1 to 80 MPa was investigated. The numerical results of K IIC vs. confinement match very well with laboratory tests, and the development of complex shear fractures during the test are analyzed in terms of the formation and coalescence of tensile and shear micro-cracking at different confining stresses, and the use of numerical acoustic emission recording.