scholarly journals A rate- and state-dependent ductile flow law of polycrystalline halite under large shear strain and implications for transition to brittle deformation

2010 ◽  
Vol 37 (9) ◽  
pp. n/a-n/a ◽  
Author(s):  
Hiroyuki Noda ◽  
Toshihiko Shimamoto
Keyword(s):  
Shear Strain ◽  
Brittle Deformation ◽  
State Dependent ◽  
Ductile Flow ◽  
Flow Law ◽  
Large Shear Strain

Gelation of Cross-Linked Casein under Small and Large Shear Strain

2013 ◽  
Vol 45 (2) ◽  
pp. 130-137 ◽  
Author(s):  
Harald Rohm ◽  
Franziska Ullrich ◽  
Carolin Schmidt ◽  
Jürgen Löbner ◽  
Doris Jaros
Keyword(s):  
Shear Strain ◽  
Large Shear Strain

Evidence that viscous shear zones spontaneously establish hydro-mechanical anisotropy

2020 ◽  
Author(s):  
James Gilgannon ◽  
Marius Waldvogel ◽  
Thomas Poulet ◽  
Florian Fusseis ◽  
Alfons Berger ◽  
...  
Keyword(s):  
Shear Strain ◽  
Transport Properties ◽  
Fluid Transport ◽  
Shear Zones ◽  
Mechanical Anisotropy ◽  
Carrara Marble ◽  
Dynamic Permeability ◽  
Viscous Shear ◽  
Porous Domain ◽  
Large Shear Strain

<p>We revisit large shear strain deformation experiments on Carrara marble and observe that anisotropic porous domains develop spontaneously during shearing. Specifically, as samples are deformed periodic porous sheets are documented to emerge and are found to transfer mass. These results imply that viscous shear zones may naturally partition fluids into highly anisotropic bands. As this hydro-mechanical anisotropy is produced by creep, each porous sheet is interpreted to represent a transient dynamic pathway for fluid transport. It is unclear how long each porous domain is uniquely sustained but it is clear that sheets are persistently present with increasing strain. Our results forward the idea that viscous shear zones have dynamic transport properties that are not related to fracturing or chemical reaction. We believe these new results provide experimental foundation for changing the paradigm of viscosity in rocks to include dynamic permeability. In our view making this change in perspective could alter many classical interpretations in natural banded mylonite zones, for example shear zone parallel syn-kinematic veining may be the result of pore sheet instability and ductile fracturing.</p>

scholarly journals Effect of Sand Fouling on the Dynamic Properties and Volume Change of Gravel During Cyclic Loadings

2020 ◽  
Author(s):  
Meysam Bayat
Keyword(s):  
Shear Modulus ◽  
Shear Strain ◽  
Dynamic Behavior ◽  
Volume Change ◽  
Dynamic Properties ◽  
Damping Ratio ◽  
Confining Pressure ◽  
Triaxial Tests ◽  
Practical Applications ◽  
Large Shear Strain

Understanding the factors that influence the dynamic behavior of granular soils during cyclic loading is critical to infrastructure design. Previous research has lacked quantitative study of the effects of fouling index (FI), mean effective confining pressure, relative density, shear strain level and anisotropic consolidation, especially when the effective vertical stress is lower than the effective horizontal stress on the dynamic behavior of gravelly soils. The objective of the present study was to evaluate the dynamic behavior and volume change of both clean and fouled specimens for practical applications. To this end, cyclic triaxial tests with local strain measurements under both isotropic and anisotropic confining conditions were conducted. It is found that the fouled specimen with 50 % sand (i.e. the specimen which contains 50 % gravel and 50 % sand) has the highest shear modulus at low shear strain levels and the largest volume reduction and damping ratio at large shear strain levels. The results of tests indicate that the effect of fouling index on the shear modulus is reduced at large shear strain levels. Volumetric contraction due to the increase in mean effective confining pressure is more significant at large shear strain levels. The results also indicate that the stiffness of the specimens under anisotropic compression mode are larger than those in extension or isotropic mode.

scholarly journals Publisher Correction: Ferroelastic-switching-driven large shear strain and piezoelectricity in a hybrid ferroelectric

2021 ◽  
Author(s):  
Yuzhong Hu ◽  
Lu You ◽  
Bin Xu ◽  
Tao Li ◽  
Samuel Alexander Morris ◽  
...  
Keyword(s):  
Shear Strain ◽  
Large Shear Strain

scholarly journals Determination of geometrically necessary dislocations in large shear strain localization in aluminum

2016 ◽  
Vol 118 ◽  
pp. 383-394 ◽  
Author(s):  
Chaoyi Zhu ◽  
Tyler Harrington ◽  
Veronica Livescu ◽  
George T. Gray ◽  
Kenneth S. Vecchio
Keyword(s):  
Shear Strain ◽  
Strain Localization ◽  
Large Shear Strain

Reverse Transformation Behavior Induced by Shot-Peening for SUS410S Martensitic Stainless Steel

2016 ◽  
Vol 879 ◽  
pp. 2003-2007
Author(s):  
Nagomi Tsuboi ◽  
Serika Higa ◽  
Hisashi Sato ◽  
Yoshimi Watanabe
Keyword(s):  
Stainless Steel ◽  
Shear Strain ◽  
Shot Peening ◽  
Martensitic Stainless Steel ◽  
Volume Fraction ◽  
Martensite Phase ◽  
Reverse Transformation ◽  
Transformation Behavior ◽  
Thermally Induced ◽  
Large Shear Strain

Reverse transformation behavior of thermally-induced martensite phase (α’) in martensitic stainless steel by the shot-peening is investigated. It is found that volume fraction of austenite phase (γ) on the peened surface is increased by the shot-peening under elevated temperature. This means that reverse transformation from thermally-induced α’ to γ can be induced by the shot-peening. Moreover, with decreasing the distance between blast nozzle and specimen (blast distance), the reverse transformation occurs more remarkably. This is because that larger shear strain can be induced by the shot-peening with shorter blast distance. Furthermore, thickness of the deformation-induced layer becomes larger as the blast distance decreases. It can be concluded that the reverse transformation in SUS410S with thermally-induced α’ occurs by large shear strain during the shot-peening.

scholarly journals Deformation rates in combined compression and shear for ice which is initially isotropic and after the development of strong anisotropy

1996 ◽  
Vol 23 ◽  
pp. 247-252 ◽  
Author(s):  
Li Jun ◽  
T.H Jacka ◽  
W.F. Budd
Keyword(s):  
Shear Stress ◽  
Steady State ◽  
Stress State ◽  
Strain Rate ◽  
Shear Strain ◽  
Uniaxial Compression ◽  
Simple Shear ◽  
Strain Rates ◽  
Shear Strain Rate ◽  
State Dependent

Laboratory-prepared fine-grained, initially isotropic polycrystalline ice samples were deformed under conditions of simple shear with simultaneous uniaxial compression at a constant temperature of −2.0°C. The aim was to investigate the effects of stress configuration on the flow rate of initially isotropic ice and on ice with subsequent stress and strain-induced anisotropy. Experiments were carried out for various combinations of shear and compression with shear stress ranging from 0 to 0.49 MPa and compressive stress ranging from 0 to 0.98 MPa, but such that for every experiment the octahedral shear stress was 0.4 MPa.The strain curves resulting from the experiments clearly exhibit minimum strain rates while the ice is still isotropic, and steady-state tertiary strain rates along with the development of steady-state anisotropic fabric patterns. With constant octahedral stress (root-mean-square of the principal stress deviators), the minimum octahedral shear-strain rate has no dependence on stress configuration. This result supports the hypothesis that the flow of isotropic ice is dependent only on the second invariant of the stress tensor. This fundamental assumption has been used to provide a general description of ice-flow behaviour independent of the stress configuration (e.g. Nye, 1953; Glen, 1958; Budd, 1969).For the tertiary flow of anisotropic ice, the octahedral strain rate is stress-state dependent as a consequence of the developed crystal-orientation fabric, which is also stress-state dependent, and which develops with strain and rotation. The present tests indicate that the enhancement factor for steady-state tertiary octahedral shear-strain rate depends on the shear or compression fraction and varies from about 10 for simple shear (with zero compression) to about 3 for uniaxial compression (with zero shear).

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