The crack growth mechanism from 3-D surface flaw with strain and acoustic emission measurement under axial compression

R. H C Wong, Y. S H Guo, Kam Tim Chau, W. S. Zhu, S. C. Li

Research output: Journal article publicationConference articleAcademic researchpeer-review

8 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)2357-2360
Number of pages4
JournalKey Engineering Materials
Volume353-358
Issue numberPART 4
Publication statusPublished - 19 Nov 2007
EventAsian Pacific Conference for Fracture and Strength (APCFS'06) - Sanya, Hainan Island, China
Duration: 22 Nov 200625 Nov 2006

Keywords

  • Acoustic emission (AE)
  • Anti-wing crack
  • Energy
  • Strain
  • Surface flaw
  • Wing crack

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

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