Investigation of the rate dependence of fracture propagation in rocks using digital image correlation (DIC) method

Gao, Guiyun; Yao, Wei; Xia, Kaiwen; Li, Zeyu

doi:10.1016/j.engfracmech.2015.02.021

Cited by 128 publications

(37 citation statements)

References 31 publications

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“…Also the loading rate has a strong effect on the fracture strength and fracture toughness of rocks and other brittle materials [1,2]. One of the most obvious engineering applications where both confinement and loading rate have significant roles is the percussive drilling of hard rocks, where the drill hammer impacts the rock at high speed causing extremely high pressures on the rock under the relatively small cross sectional area of the hammer buttons.…”

Section: Introductionmentioning

confidence: 99%

Effects of strain rate and confining pressure on the compressive behavior of Kuru granite

Hokka

Black

Tkalich

et al. 2016

International Journal of Impact Engineering

164

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Section: Introductionmentioning

confidence: 99%

Effects of strain rate and confining pressure on the compressive behavior of Kuru granite

Hokka

Black

Tkalich

et al. 2016

International Journal of Impact Engineering

164

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“…Image Correlation to Capture Dynamic Ruptures. The digital image correlation method has been successfully applied in a variety of dynamic applications [88][89][90][91][92][93][94]. However, quantifying with DIC the full-field evolution of dynamic ruptures traveling at speeds in the range of several kilometers per second (typically 1 km/s for a sub-Rayleigh rupture and up to about 2.6 km/s for a supershear rupture) has its own set of challenges, requiring a temporal acquisition on the order of 1-2 MHz, in order to capture the Fig.…”

Section: Challenges In Developing Ultrahigh-speed Digitalmentioning

confidence: 99%

Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation

Rosakis

Rubino

Lapusta

2020

Journal of Applied Mechanics

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The last few decades have seen great achievements in dynamic fracture mechanics. Yet, it was not possible to experimentally quantify the full-field behavior of dynamic fractures, until very recently. Here, we review our recent work on the full-field quantification of the temporal evolution of dynamic shear ruptures. Our newly developed approach based on digital image correlation combined with ultrahigh-speed photography has revolutionized the capabilities of measuring highly transient phenomena and enabled addressing key questions of rupture dynamics. Recent milestones include the visualization of the complete displacement, particle velocity, strain, stress and strain rate fields near growing ruptures, capturing the evolution of dynamic friction during individual rupture growth, and the detailed study of rupture speed limits. For example, dynamic friction has been the biggest unknown controlling how frictional ruptures develop but it has been impossible, until now, to measure dynamic friction during spontaneous rupture propagation and to understand its dependence on other quantities. Our recent measurements allow, by simultaneously tracking tractions and sliding speeds on the rupturing interface, to disentangle its complex dependence on the slip, slip velocity, and on their history. In another application, we have uncovered new phenomena that could not be detected with previous methods, such as the formation of pressure shock fronts associated with “supersonic” propagation of shear ruptures in viscoelastic materials where the wave speeds are shown to depend strongly on the strain rate.

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“…Mahanta et al [19] studied the strain rate sensitivity to rock fracture toughness, and the results indicated that, with increasing strain rates, the fracture toughness and tensile strength gradually increased. Previous studies have shown that the parameters of fracture velocity, rock strength, and fracture initiation toughness exhibited significant loading rate dependence [20][21][22][23][24]. However, the conventional monitoring methods, including AE and strain gauge, cannot supply adequate information about crack propagation, which restrict its application.…”

Section: Introductionmentioning

confidence: 99%

“…However, experimental investigations of mechanical properties and fracture behaviour of rocks were commonly performed at a macroscopic level [23]. In order to obtain the microcracking and microdeformation characteristics around the crack tip more accurately, combining a microscopic imaging platform with high spatial resolution with the DIC technique is an important trend to further develop rock fracture mechanical experiments [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Microscopic Investigation of Rate Dependence on Three‐Point Notched‐Tip Bending Sandstone

Shaikh

Wang

et al. 2019

Shock and Vibration

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The cracking process in rock or concrete is usually characterized by the formation of microcracks that eventually form a propagating macrocrack. A series of three-point bending experiments were performed on sandstone containing Mode I crack under different loading rates. The microscopic monitoring system was established to capture the cracking process at notch tip. The loading rate dependence of microcracking behaviour was analysed based on load-time curves, acoustic emission (AE), microscopic images, and micrograph-based digital image correlation (DIC) technology. Results showed that the specimens underwent a short period of compression and elastic deformation stage under high loading rate, and the peak loads increased with the increase in loading rate. The AE results revealed that the fracturing process can be divided into elastic stage, damage stage, and postpeak stage, and more extensive damage occurred before the peak under low loading rate. It can be observed from microscopic images that the crack was initiated during the elastic stage, which was earlier than that determined from the AE monitoring. In addition, the microcracks were initiated at multiple locations and were mainly located at the interfaces between dense grains under low loading rate, while microcracks were observed inside the grains under high loading rate. Furthermore, the DIC results showed that the crack opening displacement (COD) of 0.6 mm/min at the peak was almost twice than that of 3.0 mm/min. The COD under the same loading rate at the peak can be considered as the material property of sandstone.

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Investigation of the rate dependence of fracture propagation in rocks using digital image correlation (DIC) method

Cited by 128 publications

References 31 publications

Effects of strain rate and confining pressure on the compressive behavior of Kuru granite

Effects of strain rate and confining pressure on the compressive behavior of Kuru granite

Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation

Microscopic Investigation of Rate Dependence on Three‐Point Notched‐Tip Bending Sandstone

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