Experimental study on the fracture toughness of rust stone under mixed mode loading condition

Hua, Wen; Dong, Shiyun; Xu, Ji‐Gang

doi:10.1179/1432891715z.0000000001742

Cited by 11 publications

(12 citation statements)

References 16 publications

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“…It is observed that the mean values of the pure mode II fracture toughness are always greater than those of pure mode I for the sandstone samples under the same treatment conditions. This is very similar to the experimental results obtained with the CCBD specimens reported in the literature [43,[47][48][49]. In addition, the pure mode I, pure mode II, and mixed mode fracture toughness of the intact sandstone are always larger than those of the sandstone after undergoing water-rock interactions.…”

Section: Water-rock Interactions Affecting Fracture Resistance Of Sansupporting

confidence: 90%

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Experimental Study on Mixed Mode Fracture Behavior of Sandstone under Water–Rock Interactions

Hua

Dong

et al. 2019

Processes

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Water–rock interactions can significantly deteriorate the physical and mechanical properties of rocks, and it has been identified as one of the significant factors influencing the stability and safety of structures in rock–soil engineering. In this study, the fracture mechanical properties of sandstone under periodic water–rock interactions and long-term immersion have been studied with central cracked Brazilian disk specimens. The degradation mechanism of water–rock interactions was also studied using a scanning electron microscope (SEM). Finally, the generalized maximum tangential stress and generalized maximum tangential strain criteria were adopted to evaluate the experimental results. The results show that periodic water–rock interactions can remarkably affect the fracture resistance of sandstone. With the increase in the number of cycles, the pure mode I, pure mode II, and mixed mode fracture toughness decreases greatly, however, the values of KIf/KIC and KIIf/KIC decrease slightly. Furthermore, the fracture resistance of sandstone influenced by cyclic wetting–drying is more significant than long-term immersion. Moreover, the fracture criteria, which considers the effect of T-stress, can reproduce the test results very well.

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Section: Water-rock Interactions Affecting Fracture Resistance Of Sansupporting

confidence: 90%

“…The fracture experiments were performed with an electronic universal material testing machine (Shenzhen Reger Instrument, Shenzhen, China) for loading at a rate of 0.05 mm/min for all of the samples [43][44][45][46]. At least four CCBD specimens of sandstone in each group were successfully measured.…”

Section: Sample Preparation and Testing Proceduresmentioning

confidence: 99%

Experimental Study on Mixed Mode Fracture Behavior of Sandstone under Water–Rock Interactions

Hua

Dong

et al. 2019

Processes

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“…Additionally, the related literatures [5,22,27] show that the MTS criterion or the local symmetry criterion could be used to accurately simulate the compression-shear mixed mode propagation process consistent with the experimental outcome under appropriate conditions, which confirms the accuracy of the MTS criterion and extends its applicable range of MTS fracture criterion. However, prompted by related researches [15,16,25,[39][40][41], T-stress has a significant effect on propagation angle of the crack, while the traditional MTS criterion only contains the singular term, which would inevitably make the generalized MTS criterion considering the influence of T-stress more accurate in predicting the propagation path. Therefore, the GMTS criterion would be adopted to predict the initiation and propagation trajectory of the crack concerning the frictional contact in this work.…”

Section: Criteria For Crack Propagationmentioning

confidence: 99%

Numerical Investigation on Crack Propagation for a Central Cracked Brazilian Disk Concerning Friction

et al. 2021

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This paper concerns the effect of friction on crack propagation for the centrally cracked Brazilian disk under diametric forces by using a modified finite element method. It shows that the mode II stress intensity factor decreases obviously with the increase of friction after the crack is closed, while friction has no influence on the stress intensity factor of mode I and T-stress. Meanwhile, there are some significant influences on the crack propagation due to the change of the friction after the crack is closed with the appropriate loading angle and relative length of the crack. When T-stress is positive, the effect of friction becomes obvious and the crack propagation angle increases with a lager friction coefficient. With increasing the friction, the deviation for the crack propagation trajectory increases and the curvature of path decreases, which may lead to the change of crack type. Additionally, the larger relative crack length can amplify the effect of friction, which is similar to the loading angle.

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“…In addition, the condition of Bα < (2κ + 1)/8 should be met, and the following equation can be obtained, according to Eqs (8) and (9).…”

Section: O D I F I E D M a X I M U M T A N G E N T I A L S T R A I mentioning

confidence: 99%

“…However, some research results indicated that there were huge differences between the test results and the predictions according to the abovementioned fracture criteria. [6][7][8][9][10] This is probably because all those criteria only consider the influence of stress intensity factors (SIFs) and ignore the higher order terms of Williams' series expansion 11 (such as T-stress) in estimating the crack initiation conditions. Many researchers have used the T-stress to modify the conventional fracture criteria for improving the theoretical predictions.…”

Section: Introductionmentioning

confidence: 99%

Mixed mode fracture analysis of CCBD specimens based on the extended maximum tangential strain criterion

Hua

Dong

Pan

et al. 2017

Fatigue Fract Eng Mat Struct

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The maximum tangential strain (MTSN) criterion has been modified to include the effects of T‐stress and stress intensity factors in conditions of both plane stress and plane strain. Further, both the T‐stress and Poisson's ratio affecting the crack propagation are also discussed according to the extended MTSN (EMTSN) criterion, which is a modified MTSN criterion. Finally, the generalized maximum tangential stress (GMTS) criterion and the EMTSN criterion are used to predict the test results obtained with central cracked Brazilian disc (CCBD) specimens. The results indicate that the T‐stress and Poisson's ratio have a remarkable influence on the mixed mode fracture resistance based on the EMTSN criterion. Theoretical values of both the EMTSN and the GMTS criteria are in very good agreement with the test results. Moreover, the EMTSN criterion provides a better prediction for pure mode II.

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Experimental study on the fracture toughness of rust stone under mixed mode loading condition

Cited by 11 publications

References 16 publications

Experimental Study on Mixed Mode Fracture Behavior of Sandstone under Water–Rock Interactions

Experimental Study on Mixed Mode Fracture Behavior of Sandstone under Water–Rock Interactions

Numerical Investigation on Crack Propagation for a Central Cracked Brazilian Disk Concerning Friction

Mixed mode fracture analysis of CCBD specimens based on the extended maximum tangential strain criterion

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