A Fracture toughness criterion for concrete

Y. S. Jenq; S. P. Shah

doi:10.1016/0013-7944(85)90009-8

A Fracture toughness criterion for concrete

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

^*Corresponding author for this work

Civil and Environmental Engineering

Research output: Contribution to journal › Article › peer-review

218 Scopus citations

Abstract

Many have attempted to calculate the fracture toughness of concrete in Mode I by testing notched beam specimens. It has been observed that when K_Ic 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 K_Ic 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 K_Ic 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 language	English (US)
Pages (from-to)	1055-1069
Number of pages	15
Journal	Engineering Fracture Mechanics
Volume	21
Issue number	5
DOIs	https://doi.org/10.1016/0013-7944(85)90009-8
State	Published - 1985

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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10.1016/0013-7944(85)90009-8

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title = "A Fracture toughness criterion for concrete",

abstract = "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.",

author = "Jenq, {Y. S.} and Shah, {S. P.}",

note = "Funding Information: Acknowledgments-The researchr eportedh ere was partly supportedb y the U.S. Air Force Office of Scientific Research (Lt Co1 Lawrence D. Hokanson, Program Manager), and National Science Foundation (Dr Michael Gaus, ProgramM anager).",

year = "1985",

doi = "10.1016/0013-7944(85)90009-8",

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journal = "Engineering Fracture Mechanics",

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T1 - A Fracture toughness criterion for concrete

AU - Jenq, Y. S.

AU - Shah, S. P.

N1 - Funding Information: Acknowledgments-The researchr eportedh ere was partly supportedb y the U.S. Air Force Office of Scientific Research (Lt Co1 Lawrence D. Hokanson, Program Manager), and National Science Foundation (Dr Michael Gaus, ProgramM anager).

PY - 1985

Y1 - 1985

N2 - 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.

AB - 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.

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A Fracture toughness criterion for concrete

Abstract

ASJC Scopus subject areas

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