Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24317
Title: The effects of bridge length and material on surface crack growth and coalescence under uniaxial compression
Authors: Yin, P
Wong, RHC
Chau, KT 
Issue Date: 2012
Source: 46th US Rock Mechanics / Geomechanics Symposium 2012, 2012, v. 2, p. 975-983 How to cite?
Abstract: The objective of this study aims at increasing the understandings of the effects of bridge length and material on surface crack growth and coalescence. Both granite and PMMA specimens containing two parallel pre-existing surface cracks were tested under uniaxial compression. The bridge length of the granites specimens were varied from 16.5 mm to 26 mm. Two observation systems were used including CCD camera and acoustic emission (AE) system. Results are summarized as follows: (i) shorter bridge length facilitated the growth and coalescence of surface cracks; (ii) in granite material, two pre-existing surface cracks were coalesced together by a trust movement of the rock at the bridge area when the bridge length was 16.5 mm, and by a shear displacement at the bridge area when the bridge length was 26 mm; (iii) in granite material white patches appeared as the sign of the emanation of macrocracks, while cracks in PMMA material occurred just in a sudden form; (iv) in granite material petal cracks initiated first inside the specimen, and in PMMA material wing cracks emanated first on the specimen surface; (v) petal cracks inside the granite specimens propagated from the anti-wing crack side towards the wing crack side, whereas petal cracks in the PMMA specimens extended from the wing crack side to the other tip of the pre-existing surface crack; and (vi) petal crack coalescence appeared in both granite material and PMMA material representing as a special character of 3-D cracks.
Description: 46th US Rock Mechanics / Geomechanics Symposium 2012, Chicago, IL, 24-27 June 2012
URI: http://hdl.handle.net/10397/24317
ISBN: 9781622765140
Appears in Collections:Conference Paper

Access
View full-text via PolyU eLinks SFX Query
Show full item record

Page view(s)

41
Last Week
0
Last month
Checked on Sep 17, 2017

Google ScholarTM

Check



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.