Experimental tests of buckling folds in relation to strain ellipsoid in simple shear deformations: A discussion

1968 ◽  
Vol 5 (4) ◽  
pp. 341-342 ◽  
Author(s):  
R.P. Singh
Keyword(s):  
Simple Shear ◽  
Experimental Tests ◽  
Shear Deformations ◽  
Strain Ellipsoid

scholarly journals Correction: Transition rates for slip-avalanches in soft athermal disks under quasi-static simple shear deformations

Soft Matter ◽  
2019 ◽  
Vol 15 (17) ◽  
pp. 3627-3627 ◽  
Author(s):  
Kuniyasu Saitoh ◽  
Norihiro Oyama ◽  
Fumiko Ogushi ◽  
Stefan Luding
Keyword(s):  
Simple Shear ◽  
Soft Matter ◽  
Transition Rates ◽  
Shear Deformations

Correction for ‘Transition rates for slip-avalanches in soft athermal disks under quasi-static simple shear deformations’ by Kuniyasu Saitoh et al., Soft Matter, 2019, DOI: 10.1039/c8sm01966e.

Shear properties of passive ventricular myocardium

2002 ◽  
Vol 283 (6) ◽  
pp. H2650-H2659 ◽  
Author(s):  
Socrates Dokos ◽  
Bruce H. Smaill ◽  
Alistair A. Young ◽  
Ian J. LeGrice
Keyword(s):  
Shear Deformation ◽  
Simple Shear ◽  
Ventricular Myocardium ◽  
Left Ventricular ◽  
Shear Deformations ◽  
Shear Properties ◽  
Nonlinear Viscoelastic ◽  
Myocardial Layers ◽  
Shear Modes ◽  
Simple Shear Deformation

We examined the shear properties of passive ventricular myocardium in six pig hearts. Samples (3 × 3 × 3 mm) were cut from adjacent regions of the lateral left ventricular midwall, with sides aligned with the principal material axes. Four cycles of sinusoidal simple shear (maximum shear displacements of 0.1–0.5) were applied separately to each specimen in two orthogonal directions. Resulting forces along the three axes were measured. Three specimens from each heart were tested in different orientations to cover all six modes of simple shear deformation. Passive myocardium has nonlinear viscoelastic shear properties with reproducible, directionally dependent softening as strain is increased. Shear properties were clearly anisotropic with respect to the three principal material directions: passive ventricular myocardium is least resistant to simple shear displacements imposed in the plane of the myocardial layers and most resistant to shear deformations that produce extension of the myocyte axis. Comparison of results for the six different shear modes suggests that simple shear deformation is resisted by elastic elements aligned with the microstructural axes of the tissue.

On classical solutions of the Prandtl-Reuss equations of perfect elastoplasticity

1996 ◽  
Vol 126 (6) ◽  
pp. 1297-1308 ◽  
Author(s):  
Sergej B. Kuksin
Keyword(s):  
Simple Shear ◽  
Functional Equations ◽  
Classical Solutions ◽  
Antiplane Deformation ◽  
System Of Equations ◽  
Elastoplastic Medium ◽  
Shear Deformations ◽  
Nonlinear Functional

We study the elasticity domain for an antiplane deformation of a perfect elastoplastic medium, which is described by the Prandtl-Reuss equations. We prove that a boundary of this domain can be found by solving a system of nonlinear functional equations. In the simplest case of simple shear deformations, this system of equations is studied in detail.

Insights into a dextral transtensional shear zone in NW Anatolia, Turkey: Preliminary results from the three dimensional strain and kinematic analyses of the Marmara Granitoid. 

2021 ◽  
Author(s):  
Salim Birkan Bayrak ◽  
Alp Ünal ◽  
Işıl Nur Güraslan ◽  
Ömer Kamacı ◽  
Erdinç Yiğitbaş ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Simple Shear ◽  
Boundary Migration ◽  
Pure Shear ◽  
Three Dimensional ◽  
Ductile Deformation ◽  
Kinematic Vorticity ◽  
Strain Ellipsoid ◽  
Kinematic Analyses ◽  
Mean Trend

<p>Marmara Granitoid (MG) is an E-W trending sill-like magmatic body exposed in the center of the Marmara Island, NW Anatolia, Turkey. MG is lower Eocene in age and was concordantly emplaced into metamorphic basement rocks of Saraylar Marble and Erdek Complex. It is represented by a deformed granodiorite which widely displays protomylonitic-mylonitic textures with prominent foliation and lineation. Foliation planes display a mean dip direction-angle of 335/29 and mineral stretching lineations show mean trend-plunge of 286/34. Mica-fishes, rotated porphyroclasts and micro-faults are commonly observed and serve as shear gauges pointing out to a dextral movement. Mineral deformation thermometers such as myrmekite development, chessboard extinction, grain boundary migration (GBM), sub-grain rotation recrystallization (SGR), and bulging recrystallization (BLG) in quartz crystals indicate that solid-state deformation of the MG has experienced a high-temperature ductile deformation and superimposed ductile to brittle deformation.</p><p>Three-dimensional strain ellipsoid measurements are investigated on the MG in order to determine the relative amounts of pure shear and simple shear deformation and the mean kinematic vorticity number (W<sub>m</sub>). The image processing of quartz grains is used as strain markers to obtain the three-dimensional best-fit ellipsoids. The results show that, Lode’s ratio (ν) of the samples change between -0.010 and -0.650 and Flinn’s k-values range from 1.026 to 11.157 indicating to a general constrictional (prolate) deformation. The calculated kinematic vorticity numbers change between 0.429 and 0.958 which show that shear deformation of MG is mostly dominated by simple shear. All of these micro and meso structural properties and three-dimensional strain and kinematic analyses collectively suggest that MG has experienced a dextral transtensional deformation.</p>

Non-cylindrical folds, linear structures in the X direction and mylonite developed during translation of the Caledonian Kalak Nappe Complex of Finnmark

1977 ◽  
Vol 114 (5) ◽  
pp. 329-341 ◽  
Author(s):  
S. Rhodes ◽  
R. A. Gayer
Keyword(s):  
Simple Shear ◽  
Large Strains ◽  
Linear Structures ◽  
Individual Layer ◽  
Shear Model ◽  
Strain Ellipsoid ◽  
Nappe Complex ◽  
Cylindrical Folds

SummaryStructural evidence from the Kalak Nappe Complex suggests the operation of layer parallel shearing stresses during the translation of the nappes. A simple shear model invoking irregular areas of high cohesion within individual layer boundaries is used to explain the development of both intra-folial, cylindrical and non-cylindrical folds and a regular zone of syn-folding blasto-mylonite at the base of the nappe(s). Fold hinges that are initially developed parallel to the Y axis of the strain ellipsoid during layer parallel shearing may be rotated towards the X direction as a result of large strains concentrated at points of high cohesion within the layering boundaries.

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