Mixed-mode fracture toughness testing of concrete beams in three-point bending

Swartz, S. E.; Lu, Le‐Wu; Tang, Liming

doi:10.1007/bf02472526

Cited by 22 publications

(9 citation statements)

References 3 publications

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“…In this method, only energy absorbed by the beam to the point of instability is considered. The energy release rate may be given by Swartz et al 1988 …”

Section: Specimenmentioning

confidence: 99%

“…Several experimental works based on mixed mode fracture of concrete and similar materials have been performed by Kazemi and Vossoughi Shahvaril (2004), Gálvez et al (1998Gálvez et al ( , 2002, Swartz et al (1988) and Jenq and Shah (1988). Some of them were developed using different experimental methods for quantifying fracture phenomena, being based on optical methods such as moiré interferometry by He et al (1997), electronic speckle pattern interferometry by Li et al (2009) and Richter et al (1988) and acoustic emission by Ohtsu et al (1999).…”

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confidence: 99%

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Experimental investigation of mixed-mode-I/II fracture in polymer mortars using digital image correlation method

Nunes

Reis

2014

Lat. Am. j. solids struct.

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The purpose of this work is to investigate experimentally the effects of mixed-mode I/II loading on the fracture behavior of polymer mortars. Three point bend beam specimens with offcenter notch were used in plane-strain fracture toughness tests. Two approaches have been simultaneously used to determine the crack opening displacements. The crack mouth opening displacement was measured by means of a clip gauge, while the crack tip opening displacement was estimated through the Digital Image Correlation method. Fracture parameters, such as critical values of crack opening displacement, energy release rate and mixed-mode stress intensity factor were estimated. In addition, the values of crack mouth opening displacement and crack tip opening displacement were used to evaluate the rotational factor. Finally, the effect of sliding mode-II in fracture was not easily observed using clip gage, however this effect was noticed employing Digital Image Correlation method.

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“…In this method, only energy absorbed by the beam to the point of instability is considered. The energy release rate may be given by Swartz et al 1988 …”

Section: Specimenmentioning

confidence: 99%

mentioning

confidence: 99%

Experimental investigation of mixed-mode-I/II fracture in polymer mortars using digital image correlation method

Nunes

Reis

2014

Lat. Am. j. solids struct.

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“…On the other hand, various fracture experiments have been conducted in the past to study the processes of crack growth in quasi‐brittle materials under combined tension–shear loading. For example, The cracked rectangular beam subjected to three or four point bend loading (3PB and 4PB) 16–22 and the centrally cracked Brazilian disc (CCBD) under diametral compression 1 , 23–27 are two major and favourite test configurations for investigating combined mode I/II fracture toughness in engineering materials like concretes and cements, mortars and rocks. The obtained data from these experiments are often compared with the fracture criteria mentioned earlier.…”

Section: Introductionmentioning

confidence: 99%

Brittle fracture evaluation of a fine grain cement mortar in combined tensile‐shear deformation

Aliha

Ayatollahi

2009

Fatigue Fract Eng Mat Struct

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A B S T R A C T Different laboratory experiments are usually conducted to characterize the fracture behaviour and integrity properties of newly developed structural materials. However, the reported fracture tests data for an improved high strength cement mortar (HSCM) under combined tension-shear loading are not in agreement with theoretical predictions obtained from well-known fracture criteria. It is shown in this paper that the significant difference existing between the experimental and theoretical results is due to ignoring the effect of T-stress on the processes of crack growth in the HSCM test specimens. A modified fracture model is then used to show that the theoretical predictions can be corroborated by the experimental results when the effect of T-stress is taken into account.

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“…These values are higher than those reported in the literature. In the 1980s, Swartz et al 44 concluded from their experiments that the mode II fracture energy density is eight to ten times higher than the mode I fracture energy density while Bazant and Pfeiffer 45 reported it to be thirty times higher. As there is very little information in the literature on the mode II fracture energy density parameter, more experimentation is needed to better tune the value of this material property.…”

Section: Discussionmentioning

confidence: 99%

A method for introducing mode II dissipation energy into mixed fracture analyses

Blanco

2022

Fatigue Fract Eng Mat Struct

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This paper presents a methodology to consider the mode II fracture energy density in those analyses in which the phenomenon of mixed fracture occurs. The method consists of using a fracture energy density calculated as the weighted average of the fracture energy densities in mode I and mode II, the weighting factors being the relative importance of the mode I and II deformations with respect to the total deformation. This methodology has been implemented in local damage models using the smeared crack approximation but can be implemented in more complex models such as nonlocal damage models. Since there is no specific experimental test to measure the mode II fracture energy density, this method allows this parameter to be measured indirectly by adjusting its value so that the numerical equilibrium curve matches the experimental results.

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Mixed-mode fracture toughness testing of concrete beams in three-point bending

Cited by 22 publications

References 3 publications

Experimental investigation of mixed-mode-I/II fracture in polymer mortars using digital image correlation method

Experimental investigation of mixed-mode-I/II fracture in polymer mortars using digital image correlation method

Brittle fracture evaluation of a fine grain cement mortar in combined tensile‐shear deformation

A method for introducing mode II dissipation energy into mixed fracture analyses

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