Experimental and numerical investigations on fracture process zone of rock–concrete interface

W. Dong, D. Yang, X. Zhou, G. Kastiukas, B. Zhang

Research output: Contribution to journalArticle

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Abstract

A crack propagation criterion for a rock-concrete interface is employed to investigate the evolution of the fracture process zone (FPZ) in rock-concrete composite beams under three-point bending (TPB). According to the criterion, cracking initiates along the interface when the difference between the mode I stress intensity factor (SIF) at the crack tip caused by external loading and the one caused by the cohesive stress acting on the fictitious crack surfaces reaches the initial fracture toughness of a rock-concrete interface. From the experimental results of the composite beams with various initial crack lengths but equal depths under TPB, the interface fracture parameters are determined. In addition, the FPZ evolution in a TPB specimen is investigated by using a digital image correlation (DIC) technique. Thus, the fracture processes of the rock-concrete composite beams can be simulated by introducing the initial fracture criterion to determine the crack propagation. By comparing the load versus crack mouth opening displacement (CMOD) curves and FPZ evolution, the numerical and experimental results show a reasonable agreement, which verifies the numerical method developed in this study for analysing the crack propagation along the rock-concrete interface. Finally, based on the numerical results, the effect of ligament length on the FPZ evolution and the variations of the fracture model during crack propagation are discussed for the rock-concrete interface fracture under TPB. The results indicate that ligament length significantly affects the FPZ evolution at the rock-concrete interface under TPB, and the stress intensity factor ratio of mode II to I is influenced by the specimen size during the propagation of the interfacial crack.
Original languageEnglish
Pages (from-to)820-835
Number of pages16
JournalFatigue and Fracture of Engineering Materials and Structures
Volume40
Issue number5
Early online date22 Nov 2016
DOIs
Publication statusPublished - May 2017

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Rocks
Concretes
Crack propagation
Cracks
Ligaments
Stress intensity factors
Composite materials
Crack tips
Fracture toughness
Numerical methods

Keywords

  • rock-concrete interface; interfacial fracture; FPZ evolution; crack propagation; numerical simulation

Cite this

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title = "Experimental and numerical investigations on fracture process zone of rock–concrete interface",
abstract = "A crack propagation criterion for a rock-concrete interface is employed to investigate the evolution of the fracture process zone (FPZ) in rock-concrete composite beams under three-point bending (TPB). According to the criterion, cracking initiates along the interface when the difference between the mode I stress intensity factor (SIF) at the crack tip caused by external loading and the one caused by the cohesive stress acting on the fictitious crack surfaces reaches the initial fracture toughness of a rock-concrete interface. From the experimental results of the composite beams with various initial crack lengths but equal depths under TPB, the interface fracture parameters are determined. In addition, the FPZ evolution in a TPB specimen is investigated by using a digital image correlation (DIC) technique. Thus, the fracture processes of the rock-concrete composite beams can be simulated by introducing the initial fracture criterion to determine the crack propagation. By comparing the load versus crack mouth opening displacement (CMOD) curves and FPZ evolution, the numerical and experimental results show a reasonable agreement, which verifies the numerical method developed in this study for analysing the crack propagation along the rock-concrete interface. Finally, based on the numerical results, the effect of ligament length on the FPZ evolution and the variations of the fracture model during crack propagation are discussed for the rock-concrete interface fracture under TPB. The results indicate that ligament length significantly affects the FPZ evolution at the rock-concrete interface under TPB, and the stress intensity factor ratio of mode II to I is influenced by the specimen size during the propagation of the interfacial crack.",
keywords = "rock-concrete interface; interfacial fracture; FPZ evolution; crack propagation; numerical simulation",
author = "W. Dong and D. Yang and X. Zhou and G. Kastiukas and B. Zhang",
note = "Acceptance in SAN AAM: 12m embargo Exception email in SAN Available in Brunel rep: In Brunel repository: https://bura.brunel.ac.uk/handle/2438/13464 Confirmed deposited there compliantly on 8/11/16, updated Pure record. ET 9/11/18 ^Update: Available in Brunel rep. as part of exceptions review (Oct18).",
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Experimental and numerical investigations on fracture process zone of rock–concrete interface. / Dong, W.; Yang, D.; Zhou, X.; Kastiukas, G.; Zhang, B.

In: Fatigue and Fracture of Engineering Materials and Structures, Vol. 40, No. 5, 05.2017, p. 820-835.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Experimental and numerical investigations on fracture process zone of rock–concrete interface

AU - Dong, W.

AU - Yang, D.

AU - Zhou, X.

AU - Kastiukas, G.

AU - Zhang, B.

N1 - Acceptance in SAN AAM: 12m embargo Exception email in SAN Available in Brunel rep: In Brunel repository: https://bura.brunel.ac.uk/handle/2438/13464 Confirmed deposited there compliantly on 8/11/16, updated Pure record. ET 9/11/18 ^Update: Available in Brunel rep. as part of exceptions review (Oct18).

PY - 2017/5

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N2 - A crack propagation criterion for a rock-concrete interface is employed to investigate the evolution of the fracture process zone (FPZ) in rock-concrete composite beams under three-point bending (TPB). According to the criterion, cracking initiates along the interface when the difference between the mode I stress intensity factor (SIF) at the crack tip caused by external loading and the one caused by the cohesive stress acting on the fictitious crack surfaces reaches the initial fracture toughness of a rock-concrete interface. From the experimental results of the composite beams with various initial crack lengths but equal depths under TPB, the interface fracture parameters are determined. In addition, the FPZ evolution in a TPB specimen is investigated by using a digital image correlation (DIC) technique. Thus, the fracture processes of the rock-concrete composite beams can be simulated by introducing the initial fracture criterion to determine the crack propagation. By comparing the load versus crack mouth opening displacement (CMOD) curves and FPZ evolution, the numerical and experimental results show a reasonable agreement, which verifies the numerical method developed in this study for analysing the crack propagation along the rock-concrete interface. Finally, based on the numerical results, the effect of ligament length on the FPZ evolution and the variations of the fracture model during crack propagation are discussed for the rock-concrete interface fracture under TPB. The results indicate that ligament length significantly affects the FPZ evolution at the rock-concrete interface under TPB, and the stress intensity factor ratio of mode II to I is influenced by the specimen size during the propagation of the interfacial crack.

AB - A crack propagation criterion for a rock-concrete interface is employed to investigate the evolution of the fracture process zone (FPZ) in rock-concrete composite beams under three-point bending (TPB). According to the criterion, cracking initiates along the interface when the difference between the mode I stress intensity factor (SIF) at the crack tip caused by external loading and the one caused by the cohesive stress acting on the fictitious crack surfaces reaches the initial fracture toughness of a rock-concrete interface. From the experimental results of the composite beams with various initial crack lengths but equal depths under TPB, the interface fracture parameters are determined. In addition, the FPZ evolution in a TPB specimen is investigated by using a digital image correlation (DIC) technique. Thus, the fracture processes of the rock-concrete composite beams can be simulated by introducing the initial fracture criterion to determine the crack propagation. By comparing the load versus crack mouth opening displacement (CMOD) curves and FPZ evolution, the numerical and experimental results show a reasonable agreement, which verifies the numerical method developed in this study for analysing the crack propagation along the rock-concrete interface. Finally, based on the numerical results, the effect of ligament length on the FPZ evolution and the variations of the fracture model during crack propagation are discussed for the rock-concrete interface fracture under TPB. The results indicate that ligament length significantly affects the FPZ evolution at the rock-concrete interface under TPB, and the stress intensity factor ratio of mode II to I is influenced by the specimen size during the propagation of the interfacial crack.

KW - rock-concrete interface; interfacial fracture; FPZ evolution; crack propagation; numerical simulation

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DO - 10.1111/ffe.12558

M3 - Article

VL - 40

SP - 820

EP - 835

JO - Fatigue and Fracture of Engineering Materials and Structures

JF - Fatigue and Fracture of Engineering Materials and Structures

SN - 8756-758X

IS - 5

ER -