The influences of mode II loading on fracture process in rock using acoustic emission energy. (1st May 2018)

• Record Type: Journal Article
• Authors: Lin, Qing; Mao, Dengtian; Wang, Shan; Li, Shiyuan
• Is Part Of: Engineering fracture mechanics. Volume 194(2018)
• Page Start: 136
• Page End: 144
• Publication Date: 2018-05-01
• Subjects: Fracture process zone -- Acoustic emission (AE) -- AE energy -- Mixed-mode fracture -- Mode II loading; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2018.03.001
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Acoustic emission (AE) and its energy were used to study mode II loading influences. Mode II loading does not affect fully-developed fracture process zone (FPZ) length. Mode II loading does not affect the maximum value of AE energy in the FPZ. Mode II loading affects to form the stage of fully-developed FPZ. Mode II loading breaks the similarity and symmetry of AE events pattern. Abstract: The influences of mode II loading on fracture process in Berea sandstone were investigated by comparing mode I and mixed-mode fractures that were created by center and eccentric notch beams under three-point bending. Fracture process was characterized by Acoustic Emission (AE) and related energy. Experimental results show mode II loading does not affect the length of fully-developed fracture process zone and maximum value of AE energy. However, it affects the zone from reaching fully-developed stage, i.e., mixed-mode fracture before or at peak load, and mode I after the peak. It also breaks the similarity and symmetry of AE events pattern.