Multi-scale dynamic fracture model for quasi-brittle materials

Petrov, Yu. V.; Karihaloo, Bhushan Lal; Bratov, Vladimir; Bragov, A. M.

doi:10.1016/j.ijengsci.2012.06.004

Cited by 54 publications

(27 citation statements)

References 20 publications

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“…The fracture criterion based on the concept of incubation time, proposed in [7][8][9][10][11][12][13][14], makes it possible to predict the EPJ Web of Conferences unstable behaviour of the dynamic-strength characteristics observed in experiments on the dynamic fracture of solids. The fracture criterion can be written in the following general form:…”

Section: Incubation Time Criterionmentioning

confidence: 99%

“…According to the supposed concept in [13], fixed temporal and spatial characteristics of a scale level define lower and upper bounds of the characteristic size of the test specimen. Taking into account the change of material dimensions the failure characteristics of the incubation time approach can be modified within the limits only one or several failure levels.…”

Section: Size and Scale Effectmentioning

confidence: 99%

“…It should be noted that notions of "size effect" and "scale effect" in [6] were nonselective. In this paper, "size effect" and "scale effect" concrete and rocks is considered based on structuraltemporal approach, described in [7][8][9][10][11][12][13][14]. The static compressive strength and the fracture stress decreases at the growth of specimen's length (size effect) and rises at the increases of specimen's width (scale effect).…”

Section: Introductionmentioning

confidence: 99%

“…The static compressive strength and the fracture stress decreases at the growth of specimen's length (size effect) and rises at the increases of specimen's width (scale effect). Petrov et al [13] proposed, that the main characteristics of the material (incubation time and static strength) of incubation time criterion establish at a given scale level.…”

Section: Introductionmentioning

confidence: 99%

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Scale and size effects in dynamic fracture of concretes and rocks

Petrov

Selyutina

2015

EPJ Web of Conferences

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Abstract. Structural-temporal approach based on the notion of incubation time is used for interpretation of strain-rate effects in the fracture process of concretes and rocks. It is established that temporal dependences of concretes and rocks are calculated by the incubation time criterion. Experimentally observed different relations between ultimate stresses of concrete and mortar in static and dynamic conditions are explained. It is obtained that compressive strength of mortar at a low strain rate is greater than that of concrete, but at a high strain rate the opposite is true. Influence of confinement pressure on the mechanism of dynamic strength for concretes and rocks is discussed. Both size effect and scale effect for concrete and rocks samples subjected to impact loading are analyzed. Statistical nature of a size effect contrasts to a scale effect that is related to the definition of a spatio-temporal representative volume determining the fracture event on the given scale level.

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Section: Incubation Time Criterionmentioning

confidence: 99%

Section: Size and Scale Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Scale and size effects in dynamic fracture of concretes and rocks

Petrov

Selyutina

2015

EPJ Web of Conferences

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“…By the choice of the element size to be equal to d -characteristic size of the fracture process zone, the linear increment of a single fracture event will also be equal to d, as implied by the incubation time approach [12]. Once fracture condition is executed somewhere in the plate, rupture should take place and this is simulated by splitting the nodes in the point where the fracture criterion was executed.…”

Section: Simulation Techniquementioning

confidence: 99%

Numerical simulation of ZrO2(Y2O3) ceramic plate penetration by cylindrical plunger

Bratov

Kazarinov

Petrov

2015

EPJ Web of Conferences

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Abstract. In this paper dynamic fracture process due to high-speed impact of steel plunger into ceramic sample is simulated. The developed numerical model is based on finite element method and a concept of incubation time criterion, which is proven to be applicable in order to predict brittle fracture under high-rate deformation. Simulations were performed for ZrO2(Y2O3) ceramic plates. To characterize fracture process quantitatively fracture surface area parameter is introduced and controlled. This parameter gives area of new surface created during dynamic fracture of a sample and is essentially connected to energetic peculiarities of fracture process. Multiple simulations with various parameters made it possible to explore dependencies of fracture area on plunger velocity and material properties. Energy required to create unit of fracture area at fracture initiation (dynamic analogue of Griffith's surface energy) was evaluated and was found to be an order of magnitude higher as comparing to its static value.

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A New Method for Seismically Safe Managing of Seismotectonic Deformations in Fault Zones

Ruzhich

Shilko

2020

Springer Tracts in Mechanical Engineering

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The authors outline the results of long-term interdisciplinary research aimed at identifying the possibility and the methods of controlling tangential displacements in seismically dangerous faults to reduce the seismic risk of potential earthquakes. The studies include full-scale physical and numerical modeling of P-T conditions in the earth’s crust contributing to the initiation of displacement in the stick-slip regime and associated seismic radiation. A cooperation of specialists in physical mesomechanics, seismogeology, geomechanics, and tribology made it possible to combine and generalize data on the mechanisms for the formation of the sources of dangerous earthquakes in the highly stressed segments of faults. We consider the prospect of man-caused actions on the deep horizons of fault zones using powerful shocks or vibrations in combination with injecting aqueous solutions through deep wells to manage the slip mode. We show that such actions contribute to a decrease in the coseismic slip velocity in the fault zone, and, therefore, cause a decrease in the amplitude and energy of seismic vibrations. In conclusion, we substantiate the efficiency of the use of combined impacts on potentially seismically hazardous segments of fault zones identified in the medium-term seismic prognosis. Finally, we discuss the importance of the full-scale validation of the proposed approach to managing the displacement regime in highly-stressed segments of fault zones. Validation should be based on large-scale tests involving advanced technologies for drilling deep multidirectional wells, injection of complex fluids, and localized vibrational or pulse impacts on deep horizons.

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Multi-scale dynamic fracture model for quasi-brittle materials

Cited by 54 publications

References 20 publications

Scale and size effects in dynamic fracture of concretes and rocks

Scale and size effects in dynamic fracture of concretes and rocks

Numerical simulation of ZrO2(Y2O3) ceramic plate penetration by cylindrical plunger

A New Method for Seismically Safe Managing of Seismotectonic Deformations in Fault Zones

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