Numerical simulation of large shear strain drops during jog failure for echelon faults based on a heterogeneous and strain-softening model

2013 ◽  
Vol 608 ◽  
pp. 667-684 ◽  
Author(s):  
X.B. Wang ◽  
J. Ma ◽  
L.Q. Liu
Keyword(s):  
Numerical Simulation ◽  
Shear Strain ◽  
Strain Softening ◽  
Large Shear Strain

scholarly journals Normal and Fibrotic Rat Livers Demonstrate Shear Strain Softening and Compression Stiffening: A Model for Soft Tissue Mechanics

PLoS ONE ◽  
2016 ◽  
Vol 11 (1) ◽  
pp. e0146588 ◽  
Author(s):  
Maryna Perepelyuk ◽  
LiKang Chin ◽  
Xuan Cao ◽  
Anne van Oosten ◽  
Vivek B. Shenoy ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Shear Strain ◽  
Strain Softening ◽  
Tissue Mechanics ◽  
Soft Tissue Mechanics ◽  
Rat Livers

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

Analysis of Influences of Weak Joints and Confining Pressure on Rock Mass Strength by Numerical Simulation

2013 ◽  
Vol 438-439 ◽  
pp. 607-611 ◽  
Author(s):  
Da Hai Wang ◽  
Hao Ran Guo ◽  
Hui Zhao ◽  
Yan Wei Guo
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Plastic Zone ◽  
Influencing Factors ◽  
Rock Strength ◽  
Strain Softening ◽  
Confining Pressure ◽  
Plasticity Model ◽  
Rock Mass Strength

Principal influencing factors of the strength of rock mass with weak joints were studied in this paper. Dip angles of weak joints in addition with the confining pressure is studied based on strain-softening/hardening plasticity model. The broken mechanism from the perspective of plastic zone was analyzed. The strength of rock mass with weak joints is mainly under control of the joints occurrence, the joints dip and the rock strength, and great influenced by the confining pressure. A higher strength is obtained with a higher confining pressure, the broken mechanisms varies with different joints dips.

Numerical Simulation of Twin-Twin Interaction in Magnetic Shape-Memory Alloys

2008 ◽  
Vol 1090 ◽  
Author(s):  
Markus Chmielus ◽  
David Carpenter ◽  
Alan Geleynse ◽  
Michael Hagler ◽  
Rainer Schneider ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Shear Stress ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Shear Strain ◽  
Twin Boundary ◽  
Boundary Motion ◽  
Magnetic Shape Memory ◽  
Magnetic Shape Memory Alloys ◽  
Line Defects

AbstractTwin boundary motion is the mechanism that drives the plastic deformation in magnetic shape memory alloys (MSMAs), and is largely dependent on the twin microstructure of the MSMA. The twin microstructure is established during the martensitic transformation, and can be influenced through thermo-magneto-mechanical training. For self-accommodated and ineffectively trained martensite, twin thickness and magnetic-field-induced strain (MFIS) are very small. For effectively trained crystals, a single crystallographic domain may comprise the entire sample and MFIS reaches the theoretical limit. In this paper, a numerical simulation is presented describing the twin microstructures and twin boundary motion of self-accommodated martensite using disclinations and disconnections (twinning dislocations). Disclinations are line defects such as dislocations, however with a rotational displacement field. A quadrupole solution was chosen to approximate the defect structure where two quadrupoles represent an elementary twin double layer unit. In the simulation, the twin boundary was inclined to the twinning plane which required the introduction of twinning disconnections, which are line defects with a stress field similar to dislocations. The shear stress - shear strain properties of self-accommodated martensite were analyzed numerically for different initial configurations of the twin boundary (i.e. for different initial positions of the disconnections). The shear stress - shear strain curve was found to be sensitive to the initial configuration of disconnections. If the disconnections are very close to boundaries of hierarchically higher twins – such as is the case for self-accommodated martensite, there is a threshold stress for twin-boundary motion. If the disconnections are spread out along the twin boundary, twinning occurs at much lower stress.

Stability analysis of strain-softening slopes based on the gravity increase method

2019 ◽  
Vol 26 (1) ◽  
pp. 30-38
Author(s):  
Wenmin Yao ◽  
Chong Ma ◽  
Zhang Wang ◽  
Xiaolong Chen
Keyword(s):  
Slope Stability ◽  
Shear Strain ◽  
Strain Softening ◽  
Progressive Failure ◽  
Failure Process ◽  
Friction Angle ◽  
Sliding Surface ◽  
Plastic Shear Strain ◽  
Gravity Increase Method ◽  
Strain Threshold

With traditional slope stability analysis methods, it is difficult to accurately describe the progressive failure process and dynamic variation law of slope stability. The strain-softening constitutive model was therefore used to simulate the progressive failure process of a strain-softening slope based on the gravity increase method (GIM), with the displacement interface employed to determine the sliding surface. A sensitive analysis of the characteristic parameters within the softening stage was then conducted. The results are as follows: There are similar space-time evolution laws of residual strength factor and shear strain increment, with failure starting from the slope toe and extending gradually. The sliding surface of strain-softening slopes is located between that of the slope with peak strength and the sliding surface of the slope with residual strength. The stability coefficient shows an exponential growth trend with the increase of residual cohesion and residual plastic shear strain threshold, with a positive linear correlation between the residual friction angle and stability factor. The residual friction angle is the most sensitive factor in slope stability, followed by the residualcohesion, with the residual plastic shear strain threshold being the least sensitive.

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>

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