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Title: The crack growth mechanism from 3-D surface flaw with strain and acoustic emission measurement under axial compression
Authors: Wong, RHC
Guo, YSH
Chau, KT 
Zhu, WS
Li, SC
Keywords: Acoustic emission (AE)
Anti-wing crack
Surface flaw
Wing crack
Issue Date: 2007
Publisher: Scientific.Net
Source: Key engineering materials, 2007, v. 353-358, no. PART 4, p. 2357-2360 How to cite?
Journal: Key engineering materials 
Abstract: This paper presents the crack growth mechanism from a 3-D surface flaw on gabbro specimens using strain measurement and acoustic emission (AE) technique. Based on the results of strain and AE measurement, microcracks initiated inside the rock and extend to the surface of the specimen. With the observation from the measurements, four types of crack patterns initiate wing crack, anti-wing crack (opposite direction of wing crack), petal crack and compressive crack. The strain values of anti-wing cracks are larger 1 to 2 times than that of wing crack. The AE energy release from anti-wing crack is higher 2.5 times than that of wing crack, while the energy release form wing crack is the least but the compressive crack is the highest. Thus, the appearance of initiation and propagation of the anti-wing crack and compressive crack are very actively than that of the wing crack. The strain and AE measurement is not only to provide a clear concept on the mechanisms of crack growth form a 3-D surface flaw but also to provide useful knowledge on the AE property of the crack patterns.
Description: Asian Pacific Conference for Fracture and Strength (APCFS'06), Sanya, Hainan Island, 22-25 November 2006
ISSN: 1013-9826
EISSN: 1662-9795
Appears in Collections:Conference Paper

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