Effects of loading rate on rock fracture
Document identifier: oai:DiVA.org:ltu-7637
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10.1016/S0148-9062(99)00031-5Keyword: Engineering and Technology,
Civil Engineering,
Other Civil Engineering,
Teknik och teknologier,
Samhällsbyggnadsteknik,
Annan samhällsbyggnadsteknik,
Gruv- och Berganläggningsteknik,
Mining and Rock EngineeringPublication year: 1999Relevant Sustainable Development Goals (SDGs):
The SDG label(s) above have been assigned by OSDG.aiAbstract: By means of a wedge loading applied to a short-rod rock fracture specimen tested with the MTS 810 or SHPB (split Hopkinson pressure bar), the fracture toughness of Fangshan gabbro and Fangshan marble was measured over a wide range of loading rates, =10−2–106 MPa m1/2 s−1. In order to determine the dynamic fracture toughness of the rock as exactly as possible, the dynamic Moiré method and strain–gauge method were used in determining the critical time of dynamic fracture. The testing results indicated that the critical time was generally shorter than the transmitted wave peak time, and the differences between the two times had a weak increasing tendency with loading rates. The experimental results for rock fracture showed that the static fracture toughness KIc of the rock was nearly a constant, but the dynamic fracture toughness KId of the rock (≥104 MPa m1/2 s−1) increased with the loading rate, i.e. log(KId)=a log +b. Macroobservations for fractured rock specimens indicated that, in the section (which was perpendicular to the fracture surface) of a specimen loaded by a dynamic load, there was clear crack branching or bifurcation, and the higher the loading rate was, the more branching cracks occurred. Furthermore, at very high loading rates (≥106 MPa m1/2 s−1) the rock specimen was broken into several fragments rather than only two halves. However, for a statically fractured specimen there was hardly any crack branching. Finally, some applications of this investigation in engineering practice are discussed.
Authors
Z. X. Zhang
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S. Q. Kou
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J Yu
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Y Yu
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L. G. Jiang
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Per-Arne Lindqvist
Luleå tekniska universitet; Geoteknologi
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identifier: oai:DiVA.org:ltu-7637
datestamp: 2021-04-19T12:21:26Z
setSpec: SwePub-ltu
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recordCreationDate: 2016-09-29
identifier:
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-7637
10.1016/S0148-9062(99)00031-5
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titleInfo:
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lang: eng
title: Effects of loading rate on rock fracture
abstract: By means of a wedge loading applied to a short-rod rock fracture specimen tested with the MTS 810 or SHPB (split Hopkinson pressure bar) the fracture toughness of Fangshan gabbro and Fangshan marble was measured over a wide range of loading rates =10−2–106 MPa m1/2 s−1. In order to determine the dynamic fracture toughness of the rock as exactly as possible the dynamic Moiré method and strain–gauge method were used in determining the critical time of dynamic fracture. The testing results indicated that the critical time was generally shorter than the transmitted wave peak time and the differences between the two times had a weak increasing tendency with loading rates. The experimental results for rock fracture showed that the static fracture toughness KIc of the rock was nearly a constant but the dynamic fracture toughness KId of the rock (≥104 MPa m1/2 s−1) increased with the loading rate i.e. log(KId)=a log +b. Macroobservations for fractured rock specimens indicated that in the section (which was perpendicular to the fracture surface) of a specimen loaded by a dynamic load there was clear crack branching or bifurcation and the higher the loading rate was the more branching cracks occurred. Furthermore at very high loading rates (≥106 MPa m1/2 s−1) the rock specimen was broken into several fragments rather than only two halves. However for a statically fractured specimen there was hardly any crack branching. Finally some applications of this investigation in engineering practice are discussed.
subject:
@attributes:
lang: eng
authority: uka.se
topic:
Engineering and Technology
Civil Engineering
Other Civil Engineering
@attributes:
lang: swe
authority: uka.se
topic:
Teknik och teknologier
Samhällsbyggnadsteknik
Annan samhällsbyggnadsteknik
@attributes:
lang: swe
authority: ltu
topic: Gruv- och Berganläggningsteknik
genre: Research subject
@attributes:
lang: eng
authority: ltu
topic: Mining and Rock Engineering
genre: Research subject
language:
languageTerm: eng
genre:
publication/journal-article
ref
note:
Published
6
Godkänd; 1999; 20071212 (ysko)
name:
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Zhang
Z. X.
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namePart:
Kou
S. Q.
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namePart:
Yu
J
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Yu
Y
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Jiang
L. G.
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type: personal
authority: ltu
namePart:
Lindqvist
Per-Arne
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affiliation:
Luleå tekniska universitet
Geoteknologi
nameIdentifier: pali
originInfo:
dateIssued: 1999
relatedItem:
@attributes:
type: host
titleInfo:
title: International Journal of Rock Mechanics And Mining Sciences
identifier:
1365-1609
1873-4545
part:
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@attributes:
type: volume
number: 36
@attributes:
type: issue
number: 5
extent:
start: 597
end: 611
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