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On the Mechanical Behavior of Granite Material With Particular Emphasis on the Influence From Pre-Existing Cracks and Defects
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). Atlas Copco Rock Drills AB, SE-70225 Orebro, Sweden..
Grenoble Alpes Univ, Lab 3SR, F-38041 Grenoble, France..
Atlas Copco Rock Drills AB, SE-70225 Orebro, Sweden..
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
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2018 (English)In: Journal of Testing and Evaluation, ISSN 0090-3973, E-ISSN 1945-7553, Vol. 46, no 1, p. 33-45Article in journal (Refereed) Published
Abstract [en]

In this investigation, experiments were carried out in order to determine the mechanical properties of Bohus granite considering the influence from pre-existing cracks and defects. The experimental investigation aimed at a complete material characterization, for the purpose of mechanical analyses using advanced constitutive models, based on a variety of tests. In doing so, direct tensile and compression tests were performed to evaluate the stiffness and strength; quasi-oedometric tests were carried out in order to obtain the deviatoric and volumetric behavior of the material at different levels of hydrostatic pressure (up to 860 MPa); three-point bend tests were performed to evaluate the quasi-static strength of the rock and its distribution. Weibull statistics was then employed to describe the strength distribution. The intact specimens indicated a rather low scatter in the mechanical properties such as Young's modulus and tensile strength. However, specimens with large initial defects behaved differently. The failure mechanism in these specimens was not as brittle as the intact ones. The crack was opened on the tensile surface of such specimens during the three-point bend test at an early stage during loading, as demonstrated by digital image correlation results.

Place, publisher, year, edition, pages
AMER SOC TESTING MATERIALS , 2018. Vol. 46, no 1, p. 33-45
Keywords [en]
granite, constitutive characterization, pre-existing cracks, quasi-oedometric, three-point bending, digital image correlation (DIC)
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-225332DOI: 10.1520/JTE20160072ISI: 000425663000005OAI: oai:DiVA.org:kth-225332DiVA, id: diva2:1194582
Note

QC 20180403

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-04-03Bibliographically approved

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