Strain localization in planar shear of granular media: the role of porosity and boundary conditions.
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F21%3A00548154" target="_blank" >RIV/67985858:_____/21:00548154 - isvavai.cz</a>
Alternative codes found
RIV/44555601:13440/21:43896372
Result on the web
<a href="http://hdl.handle.net/11104/0324317" target="_blank" >http://hdl.handle.net/11104/0324317</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epje/s10189-021-00138-2" target="_blank" >10.1140/epje/s10189-021-00138-2</a>
Alternative languages
Result language
angličtina
Original language name
Strain localization in planar shear of granular media: the role of porosity and boundary conditions.
Original language description
Shear strain localization into shear bands is associated with velocity weakening instabilities and earthquakes. Here, we simulate steady-state plane-shear flow of numerical granular material (gouge), confined between parallel surfaces. Both constant shear stress and constant strain-rate boundary conditions are tested, and the two types of boundary conditions are found to yield distinct velocity profiles and friction laws. The inertial number, I, exerts the largest control on the layers’ behavior, but additional dependencies of friction on normal stress and thickness of the layer are observed under constant stress boundary condition. We find that shear-band localization, which is present in the quasistatic regime (I < 10−3) in rate-controlled shear, is absent under stress-controlled loading. In the latter case, flow ceases when macroscopic friction coefficient approaches the quasistatic friction value. The inertial regime that occurs at higher inertial numbers (I > 10−3) is associated with distributed shear, and friction and porosity that increase with shear rate (rate-strengthening regime). The finding that shear under constant stress boundary condition produces the inertial, distributed shear but never quasistatic, localized deformation is rationalized based on low fluctuations of shear forces in granular contacts for stress-controlled loading. By examining porositynwithin and outside a shear band, we also provide a mechanical reason why the transition between quasistatic and inertial shear coincides with the transition between localized and distributed strain.n
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
<a href="/en/project/GJ19-21114Y" target="_blank" >GJ19-21114Y: Granular mechanics of dynamically-triggered earthquakes</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal E
ISSN
1292-8941
e-ISSN
1292-895X
Volume of the periodical
44
Issue of the periodical within the volume
11
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
134
UT code for WoS article
000714359800001
EID of the result in the Scopus database
2-s2.0-85118735960