Tensile and tear-type fracture toughness of gypsum material: Direct and indirect testing methods

Pietras, Daniel; Aliha, M.R.M.; Kucheki, Hadi Ghesmati; Sadowski, Tomasz

doi:10.1016/j.jrmge.2022.11.016

Cited by 20 publications

(6 citation statements)

References 99 publications

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“…For mixed mode I/III fracture case, there are some disc, semi-disc, rectangular beam shape, or plate-type test samples subjected to tensile, compression, or bending-type loads. [55][56][57][58][59] However, many of the existing test specimens have limitations such as not being able to introduce full combinations of mode mixities or requiring complex preparation processes and testing rigs. To address this issue, a novel test configuration recently proposed by Aliha et al 60 called the "Edge Notched Disc Bend-ENDB" specimen was successfully utilized in this study to conduct a comprehensive range of mixed mode fracture toughness experiments (I/II, I/III).…”

Section: Mixed Mode I/ii and I/iii Fracture Toughness Testing On Pac ...mentioning

confidence: 99%

Mixed mode I/II and I/III fracture toughness investigation for preplaced aggregate concrete mixtures: Experimental study and theoretical prediction

Raeisi,

Rezaie,

Aliha

2024

Fatigue Fract Eng Mat Struct

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In this paper, mixed mode I/II and I/III fracture toughness of preplaced aggregate concrete was studied using an edge‐notched disc bend specimen. The results showed the dependency of the fracture toughness value on the mode mixity. The values of modes I, II, and III fracture toughness were obtained to be equal to , , and , respectively. Several theoretical fracture criteria were examined for predicting the trends of experimental data in the tested preplaced aggregate concrete material. The 3D averaged strain energy density criteria provided the best predictions for the KIIIc/KIc ratio. Mixed mode I/III fracture toughness data were between the predicted envelopes of the maximum tensile stress and 3D maximum tangential strain theories. The generalized maximum tangential stress criterion provided accurate predictions for pure mode II and mixed mode I/II fracture data among the investigated mixed mode fracture criteria. By comparing the preplaced aggregate concrete fracture results with those of other types of concrete, it is observed that preplaced aggregate concrete has acceptable and in‐the‐range fracture resistance.

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Section: Mixed Mode I/ii and I/iii Fracture Toughness Testing On Pac ...mentioning

confidence: 99%

Mixed mode I/II and I/III fracture toughness investigation for preplaced aggregate concrete mixtures: Experimental study and theoretical prediction

Raeisi,

Rezaie,

Aliha

2024

Fatigue Fract Eng Mat Struct

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“…Ma et al [22] used DSCM to study the characteristics of the influence of prefabricated crack tip curvature on the macroscopic fracture evolution process of sandstone, obtaining the correlation law between fracture toughness and crack tip curvature. Ji et al [23] obtained the critical deformation distribution law of the mudstone fracture process based on DSCM and proposed a method for determining the length of rock failure process zone.…”

Section: Introductionmentioning

confidence: 99%

Study on type I fracture characteristics and double K toughness model testing of anchored sandstone

Zhao,

Zhang,

Xing

2024

Preprint

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Engineering rock masses prone to type I tensile cracks due to excavation unloading can be reinforced with anchor rods to increase the proportion of stable fracture stage and reduce the probability of brittle failure. However, based on the traditional strength analysis method, the relationship of σ-ε is difficult to fully explain. Therefore, it holds crucial engineering and theoretical value to explore the failure mechanism of anchored rock based on the characteristics of fracture mechanics. In this paper, the fracture toughness of rock with different bolt crack relative positions and preloads is tested through speckle light measurement. The double K fracture criterion is introduced, and the mechanism of crack arrest and toughening of bolts is discussed based on the net stress intensity factor theory. The research results indicate that the closing force generated by the lateral action of the anchor rod significantly reduces the range of rock strain localization. While it has a limited effect on delaying rock cracking, it can effectively delay crack propagation and intersection. The initiation and instability fracture toughness of rocks show a logarithmic increasing trend with the shortening of the relative position between anchor bolts and cracks and the increase of preload. Increasing the net stress intensity factor at the crack tip of the bolt improves the rock crack initiation and unstable fracture toughness. After anchoring, the rock crack initiation and unstable fracture toughness increased by 90% and 130%, respectively. The length and time of the stable crack growth stage increased by 50% and 70%, respectively.

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“…On the other hand, some researchers have focused on the experimental determination of fracture toughness value for rocks or geo-materials under different loading modes, different temperatures and different confining pressures. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] Due to the cylindrical shape of rock cores, disc and circular type specimens are among the common and frequently used test configurations for conducting the rock fracture toughness experiments. Center cracked Brazilian disc, 15,26 edge cracked semi-circular bend, [25][26][27][28] edge notched disc subjected to three-point bending, 19,20,23 single or double edge notched diametral compressed disc 14,24,29 punch through shear, 30,31 short rod tension, 15,16 and edge cracked cylinder loaded with threepoint bending 15,16 are examples of testing configurations and methods for determining the fracture toughness of rock and geo-materials.…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, a number of researchers have simulated the hydraulic fracturing process for wellbores containing artificial crack or perforation to determine the crack tip stress intensity factors 7–10 and to relate these factors to the pumping pressure and magnitude and direction of the applied in situ stresses. On the other hand, some researchers have focused on the experimental determination of fracture toughness value for rocks or geo‐materials under different loading modes, different temperatures and different confining pressures 11–28 . Due to the cylindrical shape of rock cores, disc and circular type specimens are among the common and frequently used test configurations for conducting the rock fracture toughness experiments.…”

Section: Introductionmentioning

confidence: 99%

3D numerical analysis of stability and onset of hydraulic fracture in the vertical‐oblique‐horizontal wells under wide range of in situ stresses

Shan,

Zhao,

et al. 2023

Fatigue Fract Eng Mat Struct

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Influence of the depth and location of perforation, direction and magnitudes of in situ stresses, wellbore angle, and pumping pressure is investigated numerically for the hydraulic fracture. 3D models of rock formation with vertical, inclined or horizontal wells containing semi‐circular crack are analyzed to obtain both KI and the minimum pumping pressure. By computing the magnitude and sign of the T‐stress it is demonstrated that hydraulic fracture path is generally stable except for a very limited situations in which the vertical well is subjected to the lowest in situ stresses. The minimum horizontal in situ stress has the most dominant role in controlling the hydraulic fracture. A direct relationship between KI and T was obtained for different ranges of in situ stresses and some relations were presented for estimating the critical stress intensity factor at the onset of hydraulic fracture and minimum injection pressure in terms of the applied in situ stresses.

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Tensile and tear-type fracture toughness of gypsum material: Direct and indirect testing methods

Cited by 20 publications

References 99 publications

Mixed mode I/II and I/III fracture toughness investigation for preplaced aggregate concrete mixtures: Experimental study and theoretical prediction

Mixed mode I/II and I/III fracture toughness investigation for preplaced aggregate concrete mixtures: Experimental study and theoretical prediction

Study on type I fracture characteristics and double K toughness model testing of anchored sandstone

3D numerical analysis of stability and onset of hydraulic fracture in the vertical‐oblique‐horizontal wells under wide range of in situ stresses

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