Frictional behaviour of simulated quartz fault gouges under hydrothermal conditions: Results from ultra-high strain rotary shear experiments

2008 ◽  
Vol 460 (1-4) ◽  
pp. 288-303 ◽  
Author(s):  
A.R. Niemeijer ◽  
C.J. Spiers ◽  
C.J. Peach
Keyword(s):  
High Strain ◽  
Hydrothermal Conditions ◽  
Rotary Shear ◽  
Fault Gouges ◽  
Frictional Behaviour

Frictional behaviour and transport properties of simulated fault gouges derived from a natural CO 2 reservoir

2016 ◽  
Vol 54 ◽  
pp. 70-83 ◽  
Author(s):  
Elisenda Bakker ◽  
Suzanne J.T. Hangx ◽  
André R. Niemeijer ◽  
Christopher J. Spiers
Keyword(s):  
Transport Properties ◽  
Fault Gouges ◽  
Frictional Behaviour

Evaluation of Friction at High Strain Rate using the Split Hopkinson Bar

2015 ◽  
Vol 651-653 ◽  
pp. 108-113 ◽  
Author(s):  
Archimede Forcellese ◽  
Edoardo Mancini ◽  
Marco Sasso ◽  
Michela Simoncini
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Dynamic Loading ◽  
High Strain ◽  
Outer Diameter ◽  
Loading Conditions ◽  
Split Hopkinson ◽  
Dynamic Loading Conditions ◽  
Static And Dynamic Loading ◽  
Frictional Behaviour

The present work aims at studying the influence of strain rate on the frictional behaviour of AA7075 aluminium alloy in the O-annealed temper state. To this purpose, ring compression tests were performed both under quasi-static and dynamic loading conditions. The high strain rate tests were carried out by means of the Split Hopkinson Tension-Compression Bar in the direct version. In both cases, hollow cylindrical samples, characterised by an initial outer diameter to inner diameter to height ratio of 6:3:2, were tested under dry condition and by lubricating with molybdenum disulphide grease. The different frictional behaviour exhibited by AA7075-O under quasi-static and dynamic loading conditions can be attributed to the strain rate effect both on the plastic flow behaviour of the deformed material, and on the thickness of the lubricant film.

scholarly journals Anisotropic transport and frictional properties of simulated clay-rich fault gouges

2020 ◽  
Author(s):  
Elisenda Bakker ◽  
Johannes H. P. de Bresser
Keyword(s):  
Co2 Storage ◽  
Shear Displacement ◽  
Direct Shear ◽  
Shale Formations ◽  
Frictional Properties ◽  
Effective Normal Stress ◽  
Storage Reservoirs ◽  
Order Of Magnitude ◽  
Fault Gouges ◽  
Frictional Behaviour

Abstract. We aimed to evaluate various factors that control the frictional and transport properties of gouge-filled faults cutting carbonate-bearing shales or claystone formations. The research experimentally determined the effect of shear displacement, dynamic shearing, static holding, and effective normal stress on fault gouge permeability, both parallel and perpendicular to the fault boundaries, as well as on frictional behaviour. The simulated gouge was prepared from crushed Opalinus Claystone (OPA), on which we performed direct shear experiments. The direct-shear experiments (σneff = 5–50 MPa, Pf = 2 MPa, and T ≈ 20 °C) showed ~1 order of magnitude decrease in permeability with shear displacement (up to ~6 mm), for both along- and across-fault fluid flow orientation. Moreover, our data showed an initial, pre-shear permeability anisotropy of up to ~1 order of magnitude, which decreased with increasing shear displacement (maturity) to ~0.5, with the along-fault permeability being consistently higher. Our results have important implications for calcite-rich claystones and shale formations, and in particular any pre-existing faults therein, that seal hydrocarbon reservoirs and potential CO2 storage reservoirs, as the current results point to a higher leakage potential of pre-existing faults compared to the intact caprock.

High shear strain behaviour of synthetic muscovite fault gouges under hydrothermal conditions

2010 ◽  
Vol 32 (11) ◽  
pp. 1685-1700 ◽  
Author(s):  
Esther W.E. Van Diggelen ◽  
Johannes H.P. De Bresser ◽  
Colin J. Peach ◽  
Christopher J. Spiers
Keyword(s):  
Shear Strain ◽  
High Shear ◽  
Hydrothermal Conditions ◽  
Strain Behaviour ◽  
Fault Gouges

Permeability evolution in quartz fault gouges under hydrothermal conditions

2007 ◽  
Vol 112 (B7) ◽  
Author(s):  
Silvio B. Giger ◽  
Eric Tenthorey ◽  
Stephen F. Cox ◽  
John D. Fitz Gerald
Keyword(s):  
Permeability Evolution ◽  
Hydrothermal Conditions ◽  
Fault Gouges

Amorphous material in high strain experimental fault gouges

1990 ◽  
Vol 95 (B10) ◽  
pp. 15589 ◽  
Author(s):  
R. A. Yund ◽  
M. L. Blanpied ◽  
T. E. Tullis ◽  
J. D. Weeks
Keyword(s):  
High Strain ◽  
Amorphous Material ◽  
Fault Gouges

Solid Solution Effects and Deformation Micros trueture of Shock-Loaded Iron Manganese Alloys

1970 ◽  
Vol 28 ◽  
pp. 420-421
Author(s):  
A. Christou ◽  
J. V. Foltz ◽  
N. Brown
Keyword(s):  
Solid Solution ◽  
Shock Loading ◽  
High Strain ◽  
Local Stress ◽  
Strain Rates ◽  
Local Stress Concentration ◽  
Bcc Metals ◽  
Manganese Alloys ◽  
Iron Manganese ◽  
Transmission Microscope

In general, all BCC transition metals have been observed to twin under appropriate conditions. At the present time various experimental reports of solid solution effects on BCC metals have been made. Indications are that solid solution effects are important in the formation of twins. The formation of twins in metals and alloys may be explained in terms of dislocation mechanisms. It has been suggested that twins are nucleated by the achievement of local stress-concentration of the order of 15 to 45 times the applied stress. Prietner and Leslie have found that twins in BCC metals are nucleated at intersections of (110) and (112) or (112) and (112) type of planes.In this paper, observations are reported of a transmission microscope study of the iron manganese series under conditions in which twins both were and were not formed. High strain rates produced by shock loading provided the appropriate deformation conditions. The workhardening mechanisms of one alloy (Fe - 7.37 wt% Mn) were studied in detail.

Plastic Deformation in Microtomed Sections

1971 ◽  
Vol 29 ◽  
pp. 458-459
Author(s):  
J. Temple Black
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Applied Stress ◽  
Elastic Strain ◽  
High Strain ◽  
Tool Material ◽  
Cutting Edge ◽  
Material Structure ◽  
Geometrical Constraints

The output of the ultramicrotomy process with its high strain levels is dependent upon the input, ie., the nature of the material being machined. Apart from the geometrical constraints offered by the rake and clearance faces of the tool, each material is free to deform in whatever manner necessary to satisfy its material structure and interatomic constraints. Noncrystalline materials appear to survive the process undamaged when observed in the TEM. As has been demonstrated however microtomed plastics do in fact suffer damage to the top and bottom surfaces of the section regardless of the sharpness of the cutting edge or the tool material. The energy required to seperate the section from the block is not easily propogated through the section because the material is amorphous in nature and has no preferred crystalline planes upon which defects can move large distances to relieve the applied stress. Thus, the cutting stresses are supported elastically in the internal or bulk and plastically in the surfaces. The elastic strain can be recovered while the plastic strain is not reversible and will remain in the section after cutting is complete.

Sign in / Sign up

Export Citation Format

Share Document