2014
DOI: 10.1016/j.engfracmech.2014.07.028
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Opening and mixed mode fracture processes in a quasi-brittle material via digital imaging

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Cited by 127 publications
(35 citation statements)
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“…An assumption is proposed that the grey value of the images remains the same before and after the deformation [23]. First of all, select a region of interest (ROI) on the specimen surface; then, divide this region into numbers of subsets; search for the corresponding subsets after deformation based on the assumption and calculate their displacement; finally, a deformation or displacement distribution map is created thereafter [21,28]. Figure 3, rock specimens were subjected to quasi-static load by a servocontrolled hydraulic machine (MTS Landmark system by MTS Inc.), whose stiffness is enough to avoid elastic energy to accumulate in the machine, in the Advanced Research Center at Central South University.…”
Section: Digital Image Correlation Methodmentioning
confidence: 99%
See 1 more Smart Citation
“…An assumption is proposed that the grey value of the images remains the same before and after the deformation [23]. First of all, select a region of interest (ROI) on the specimen surface; then, divide this region into numbers of subsets; search for the corresponding subsets after deformation based on the assumption and calculate their displacement; finally, a deformation or displacement distribution map is created thereafter [21,28]. Figure 3, rock specimens were subjected to quasi-static load by a servocontrolled hydraulic machine (MTS Landmark system by MTS Inc.), whose stiffness is enough to avoid elastic energy to accumulate in the machine, in the Advanced Research Center at Central South University.…”
Section: Digital Image Correlation Methodmentioning
confidence: 99%
“…Threedimensional digital image correlation was also applied in uniaxial compression tests on sandstone by Munoz et al [19] and the prepeak coupled with postpeak strain characteristic during the compression was provided by this 3D DIC method in a straightforward way. Lin et al [20,21] performed fracture tests on sandstone specimens under three-point bending, in which the maximum crack opening displacement and the length of the localized damage zone were measured by the digital image correlation method. A series of experiments based on DIC technique have been conducted by Ji et al [22,23] and a detailed analysis was performed to determine the fracture modes.…”
Section: Introductionmentioning
confidence: 99%
“…On one hand, a perusal of the literature surveyed in the references (in particular [4,8,10,29,33,36,[39][40][41][42]) reveals that debonding is the result of mixed modes I/II. On the other hand, however, the delayed debonding is induced by loads much lower than the loads that induce the debonding (contrary to the latter, the former is only due to permanent, quasi-permanent, and frequent loads).…”
Section: Dynamics Of Fracture Propagation At the Mesoscalementioning
confidence: 99%
“…However, durability of a RC member externally reinforced with FRP depends not only on durability of the individual materials, but also on the capacity of the concrete cover to sustain the bond stresses s b [22][23][24][25]. In fact, on one hand, the FRP-composite material keeps its original strength, elasticity, and toughness [5,13,15,16,[26][27][28]; on the other hand, however, the combination of s b and initial cracks (flaws) in the concrete cover may give rise to slow crack growth up to the critical length, and eventually to debonding of the external reinforcement [29][30][31][32][33][34][35][36]. Unfortunately, neither the structural codes nor the structural practice considers explicitly the service failure that is caused by slow crack growth in the concrete cover.…”
Section: Introductionmentioning
confidence: 99%
“…The digital image correlation (DIC) technology has been used to obtain the full-field displacement data of the specimen, see [1,2]. By extracting the horizontal displacement of the sampling line on both sides of the pre-crack and subtracting it, the opening displacement at different loading stages and the ultimate opening displacement was obtained.…”
Section: Introductionmentioning
confidence: 99%