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Friday, July 24, 2020 | History

5 edition of Brittle failure of rock materials found in the catalog.

Brittle failure of rock materials

test results and constitutive models

by George E. Andreev

  • 58 Want to read
  • 25 Currently reading

Published by A.A. Balkema in Rotterdam, Brookfield, VT .
Written in English

    Subjects:
  • Rock mechanics,
  • Brittleness,
  • Fracture mechanics

  • Edition Notes

    Includes bibliographical references (p. 413-446).

    StatementGeorge E. Andreev.
    Classifications
    LC ClassificationsTA706 .A57 1995
    The Physical Object
    Paginationx, 446 p. :
    Number of Pages446
    ID Numbers
    Open LibraryOL108150M
    ISBN 109054106026
    LC Control Number99226657

    The rheological behaviour of a rock is primarily dependent on its structure, that may either be brittle or ductile. The behaviour of brittle structures is discussed in this chapter. Crack propagation, the main mechanism for brittle failure, is explained in paragraph one.   Failure Mechanism In Ductile & Brittle Material 1. FAILURE MECHANISM In Ductile & Brittle Material 2. FRACTURE. DEFINATION: Simple fracture is the separation of a body into two or more pieces in response to an imposed stress that is static (i.e., constant or slowly changing with time) A fracture is the separation of an object or material into two or more pieces under the action of stress. .

    Material failure theory is the science of predicting the conditions under which solid materials fail under the action of external loads. The failure of a material is usually classified into brittle failure or ductile failure. Depending on the conditions (such as temperature, state of stress, loading rate) most materials can fail in a brittle or ductile manner or both.   Fault and Joint Development: In Brittle and Semi-Brittle Rock details the theoretical concepts about fault and joint development in rock when they behave as brittle or semi-brittle material. The title first covers the concepts and criteria of brittle failure, along with the limits of temperature and pressure below which rocks may behave in a Book Edition: 1.

    @article{osti_, title = {Mechanism of brittle fracture of rock. Parts }, author = {Bieniawski, Z T}, abstractNote = {In this study, presented in a series of 3 papers, a detailed mechanism of rock fracture in compression and tension has been propounded. On the basis of this mechanism, it is possible to explain all the significant processes taking place in rock from initial load.   The purpose of this review is to discuss the development and the state of the art in dynamic testing techniques and dynamic mechanical behaviour of rock materials. The review begins by briefly introducing the history of rock dynamics and explaining the significance of studying these issues. Loading techniques commonly used for both intermediate and high strain rate tests and measurement Cited by:


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Brittle failure of rock materials by George E. Andreev Download PDF EPUB FB2

1st Edition Published on January 1, by CRC Press This text comprises different basic aspects of brittle failure for rocks. It considers classical and conte Brittle Failure of Rock Materials - 1st Edition - G.E. Andreev - Rout Garland Science Website Announcement. Nonlinear fracture mechanics (NLFM) and the latest RILEM modeling techniques for testing nonlinear quasi-brittle materials; The use of R-Curves to describe cracking and fracture in quasi-brittle materials; The application of fracture mechanics to compression failure, creep, fatigue, torsion, and other advanced topicsCited by: Failuremay be defined as the stress condition at which the solid either starts to flow or break.

This stress condition thus defines the maximum stress or stress difference that the solid can sustain, that is, its load-bearing capacity. When the failure of the solid is through fracture formation, the failure is : Agust Gudmundsson.

Brittle fracture of rock 3 Figure Stress system acting on a potential failure plane in rock. Although these assumptions do introduce certain errors (Jaeger ), the magnitude of these errors is estimated to be less than ± 10% which is within the order of accuracy aimed at in this analysis. Brittle failure of rock is reviewed and multiaxial test methods are summarized.

Equations are presented to implement PMC for fitting Brittle failure of rock materials book data and determining the three material parameters. In order to get brittle shear characteristics of rock material, acoustic emission accompanied with triaxial stress-strain test was applied to monitor the emergence and development of micro cracks.

Theoretical analysis and data processing were conducted based on the theories of fracture mechanics and general rock mechanics, relations between the feature strength of three stages and the stress Cited by: 1. Brittle or quasi-brittle fracture loading is a wide field of research, which involves many researchers devoted to investigate different aspects of the mechanics and physics of fracture.

Materials usually treated include metal alloys, polymers, composites, rocks, ceramics. Brittle failure is not a phenomenon limited only to static loadings. The article reviews selected failure criteria for dry rock in the brittle regime and interprets experimental data to obtain material parameters that can be used to describe the stress state at failure.

For saturated rock, stresses should be replaced by Terzaghi effective by: 9. Introduction. Brittle failure is the product of the creation, growth and accumulation of micro- and macro-cracks.

Many researchers have reported slabbing and spalling as a dominant failure mode around underground excavations in massive to moderately jointed rock masses subjected to Cited by: Mobilised strength components in brittle failure of rock Article in Géotechnique 53(3) January with Reads How we measure 'reads'.

A novel method is developed for characterizing the mechanical response and failure mechanism of brittle rocks under dynamic compression-shear loading: an inclined cylinder specimen using a modified split Hopkinson pressure bar (SHPB) system.

With the specimen axis inclining to the loading direction of SHPB, a shear component can be introduced into the by: To simulate the failure of brittle rock materials under compressive loads, tangent bonds are introduced into the bond-based peridynamic theory.

By comparing the strain energy with peridynamic energy, the micro-peridynamic parameters can be expressed by the macromechanical parameters of rocks.

Brittle fracture of rock Under the low temperature and pressure conditions of Earth’s upper litho-sphere, silicate rock responds to large strains by brittle fracture.

The mecha-nism of brittle behavior is by the propagation of cracks, which may occur on all scales. We begin by studying this form of. Fracture initiation and propagation in intact rock e A review E. Hoeka, C.D. Martinb,* aWest Vancouver, () proposed that tensile failure in brittle materials such as glass initiates at the tips of minute defects which he rep- books on brittle failure of rock materials by Andriev () and.

Failure of a brittle rock - point when the rock loses all resistance to stress and crumbles. In plastic material, specific point of failure difficult to identify - because deformation continues indefinitely at a constant level of stress. Strength (in plastic materials) – is defined as the level of stress at failure.

Compressive Strength. Home > Journals > Canadian Geotechnical Journal > List of Issues > Vol Number 2, May > Brittle failure of rock materials: test results and constitutive model Article «Previous TOCCited by: 1. is said to occur when the ability of the to rock resist load decreases with increasing deformation.

Brittle failure is associated with materials that undergo little to no permanent deformation before failure and, depending om the test conditions, may occur suddenly and catastrophically. See brittleness. The initiation, propagation, coalescence and failure mode of brittle jointed rock mass influenced by fissure water pressure have always been studied as a hot issue in the society of rock mechanics and engineering.

In order to analyze the damage evolution process of jointed rock mass under fracture water pressure, a novel numerical model on the basis of secondary development in fast Lagrangian Cited by: 10 31 LE Brittle failure of intact rocks: Theory 3 here the μI’ is called the internal coefficient of friction, by analogy to the coefficient of sliding friction.

The prime symbol is included to indicate that the slope of the failure criterion is measured locally (small δσ 3).File Size: KB.

Mohr's theory is often used in predicting the failure of brittle materials, and is applied to cases of 2D stress. Mohr's theory suggests that failure occurs when Mohr's Circle at a point in the body exceeds the envelope created by the two Mohr's circles for uniaxial tensile strength and uniaxial compression strength.

out of 5 stars The Theory of Materials Failure by Richard M. Christensen Reviewed in the United States on June 7, This book is concerned with the development of materials failure theory that has the mathematical and physical by: Get this from a library!

Brittle failure of rock materials: test results and constitutive models. [George E Andreev].At high compressive stress, microcracks in rock lengthen in the stress direction. Slender columns of unbroken material are left between the cracks; SEM measurements of length/width ratio of these columns suggest that some could have buckled under the loads applied in the experiments, and thus been the source of the sudden instability at faulting.