A Fracture toughness criterion for concrete

Y. S. Jenq*, S. P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

218 Scopus citations


Many have attempted to calculate the fracture toughness of concrete in Mode I by testing notched beam specimens. It has been observed that when KIc is calculated from the measured values of the maximum load, the initial notch length and using the formulas developed from LEFM, its value is dependent on the dimensions of the beam. This size and geometry dependency can be attributed to slow crack growth and nonlinearity due to geometrical interlock effects. A method is suggested to calculate a size independent fracture toughness parameter. To calculate the value of KIc according to the proposed method, inelastic displacements are extracted from the total displacements and the slow crack growth is included by incorporating crack closing-pressure. Using this constant KIc criterion, the load vs crack mouth opening displacement and load vs deflection curves were accurately predicted for 40 beams of different sizes tested for this investigation as well as those reported by other investigators.

Original languageEnglish (US)
Pages (from-to)1055-1069
Number of pages15
JournalEngineering Fracture Mechanics
Issue number5
StatePublished - 1985

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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