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Article: Microcracking behavior of two semi-circular bend specimens in mode I fracture toughness test of granite
Title | Microcracking behavior of two semi-circular bend specimens in mode I fracture toughness test of granite |
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Authors | |
Keywords | Microcracking behavior Semi-circular bend specimen Acoustic emission Mode I fracture toughness test |
Issue Date | 2019 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/engfracmech |
Citation | Engineering Fracture Mechanics, 2019, v. 221, p. article no. 106565 How to Cite? |
Abstract | The semi-circular bend (SCB) specimen has been commonly used in measuring the mode I fracture toughness of rocks. However, little is known about the influence of pre-existing notch shape on its microcracking behavior. We experimentally examine the microcracking behavior of two groups of SCB medium-grained Kowloon granite specimens which possess either a straight-through notch (SNSCB specimen) or a chevron notch (CCNSCB specimen), using acoustic emission (AE). Comparing their microcracking behavior, we find that (1) a intenser development of microcracks is observed in the SNSCB specimen during the fracture process zone development phase, (2) the fully-developed fracture process zone (FD-FPZ) size of the SNSCB specimen is larger, (3) the Gutenberg-Richter b value of the AE hits detected before the specimen failure is smaller for the SNSCB specimen, indicating a larger proportion of the AE hits with relatively higher amplitude, (4) the two specimens exhibit distinct energy distributions for AE events characterizing the FD-FPZ, the AE events with the highest energy level (level 4) in the SNSCB specimen account for smaller number but larger event energy percentage of the total events in the FD-FPZ as compared with those in the CCNSCB specimen. |
Persistent Identifier | http://hdl.handle.net/10722/290151 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.232 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Wong, LNY | - |
dc.contributor.author | GUO, TY | - |
dc.date.accessioned | 2020-10-22T08:22:47Z | - |
dc.date.available | 2020-10-22T08:22:47Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Engineering Fracture Mechanics, 2019, v. 221, p. article no. 106565 | - |
dc.identifier.issn | 0013-7944 | - |
dc.identifier.uri | http://hdl.handle.net/10722/290151 | - |
dc.description.abstract | The semi-circular bend (SCB) specimen has been commonly used in measuring the mode I fracture toughness of rocks. However, little is known about the influence of pre-existing notch shape on its microcracking behavior. We experimentally examine the microcracking behavior of two groups of SCB medium-grained Kowloon granite specimens which possess either a straight-through notch (SNSCB specimen) or a chevron notch (CCNSCB specimen), using acoustic emission (AE). Comparing their microcracking behavior, we find that (1) a intenser development of microcracks is observed in the SNSCB specimen during the fracture process zone development phase, (2) the fully-developed fracture process zone (FD-FPZ) size of the SNSCB specimen is larger, (3) the Gutenberg-Richter b value of the AE hits detected before the specimen failure is smaller for the SNSCB specimen, indicating a larger proportion of the AE hits with relatively higher amplitude, (4) the two specimens exhibit distinct energy distributions for AE events characterizing the FD-FPZ, the AE events with the highest energy level (level 4) in the SNSCB specimen account for smaller number but larger event energy percentage of the total events in the FD-FPZ as compared with those in the CCNSCB specimen. | - |
dc.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/engfracmech | - |
dc.relation.ispartof | Engineering Fracture Mechanics | - |
dc.subject | Microcracking behavior | - |
dc.subject | Semi-circular bend specimen | - |
dc.subject | Acoustic emission | - |
dc.subject | Mode I fracture toughness test | - |
dc.title | Microcracking behavior of two semi-circular bend specimens in mode I fracture toughness test of granite | - |
dc.type | Article | - |
dc.identifier.email | Wong, LNY: lnywong@hku.hk | - |
dc.identifier.authority | Wong, LNY=rp02069 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.engfracmech.2019.106565 | - |
dc.identifier.scopus | eid_2-s2.0-85072715486 | - |
dc.identifier.hkuros | 316184 | - |
dc.identifier.volume | 221 | - |
dc.identifier.spage | article no. 106565 | - |
dc.identifier.epage | article no. 106565 | - |
dc.identifier.isi | WOS:000489845700011 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0013-7944 | - |