Antiplane shear fracture tests (mode III)

Zdenek P. Bazant*, Pere C. Prat, Mazen R. Tabbara

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

Mode III (antiplane) shear-fracture energies of concrete and mortar were measured on the basis of the size-effect law. The specimens were cylinders with a circumferential notch at their midlengths, subjected to pure torsion at zero axial force. The specimens were geometrically similar and their sizes varied as 1:2:4. The mortar specimens were observed to behave in a manner closer to linear elastic fracture mechanics than did the concrete specimens. The ratio of Mode III to Mode I (tensile) fracture energies was found to be about 3 for concrete and about 8 for mortar. The results indirectly indicate that a volume expansion of the sheared fracture-process zone may be a significant mechanism causing transverse tensile stresses across the ligament. The size-effect measurements also yield an estimate of the size of the fracture-process zone, which is found to be nearly the same as for Mode I fracture.

Original languageEnglish (US)
Pages (from-to)12-19
Number of pages8
JournalACI Materials Journal
Volume87
Issue number1
StatePublished - Jan 1 1990

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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    Bazant, Z. P., Prat, P. C., & Tabbara, M. R. (1990). Antiplane shear fracture tests (mode III). ACI Materials Journal, 87(1), 12-19.