scholarly journals Controlling factors and effect of geologic age and depositional environment on cyclic shear deformation characteristics of soils

2010 ◽  
Vol 5 (3) ◽  
pp. 463-478 ◽  
Author(s):  
Kazue WAKAMATSU ◽  
Nozomu YOSHIDA ◽  
Takeko MIKAMI
Keyword(s):  
Shear Deformation ◽  
Depositional Environment ◽  
Controlling Factors ◽  
Deformation Characteristics ◽  
Cyclic Shear

Shear deformation characteristics and defect evolution of the biaxial ±45° and 0/90° glass non-crimp fabrics

2020 ◽  
Vol 193 ◽  
pp. 108137 ◽  
Author(s):  
Ming Mei ◽  
Yujia He ◽  
Xujing Yang ◽  
Kai Wei ◽  
Zhaoliang Qu ◽  
...  
Keyword(s):  
Shear Deformation ◽  
Deformation Characteristics ◽  
Defect Evolution

Rheological Behavior of Semisolid Al-6.5wt%Si Alloy under Cyclic Shear Deformation

2011 ◽  
Vol 306-307 ◽  
pp. 104-107
Author(s):  
Hong Chao Luo ◽  
Jun Mei Yang ◽  
Li Yuan Sun ◽  
Li Ping Ju
Keyword(s):  
Experimental Data ◽  
Shear Rate ◽  
Hysteresis Loop ◽  
Shear Deformation ◽  
Rheological Behavior ◽  
Qualitative Agreement ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Cyclic Shear ◽  
The Difference

In the present work, the MCF model for semisolid metal slurries (SSMS) is applied to investigate the thixotropy of the Al-6.5wt%Si alloy under cyclic shear deformation. The study shows that the semisolid Al-6.5wt%Si alloy has the behavior of thixotropy. The area of the hysteresis loop increases with decreasing the up-time, the initial shear rate and increasing resting time, solid volume fraction and maximum shear rate, respectively. These results have qualitative agreement with the experimental data. The origin of the hysteresis loop is atrributed to the difference between the deagglomeration rate and the agglomeration rate.

scholarly journals Unified phase diagram of reversible–irreversible, jamming, and yielding transitions in cyclically sheared soft-sphere packings

2020 ◽  
Vol 117 (19) ◽  
pp. 10203-10209 ◽  
Author(s):  
Pallabi Das ◽  
H. A. Vinutha ◽  
Srikanth Sastry
Keyword(s):  
Phase Diagram ◽  
Shear Deformation ◽  
Soft Matter ◽  
Granular Matter ◽  
Colloidal Suspensions ◽  
Localized States ◽  
Sphere Packings ◽  
Cyclic Shear ◽  
Soft Sphere ◽  
Wide Range

Self-organization, and transitions from reversible to irreversible behavior, of interacting particle assemblies driven by externally imposed stresses or deformation is of interest in comprehending diverse phenomena in soft matter. They have been investigated in a wide range of systems, such as colloidal suspensions, glasses, and granular matter. In different density and driving regimes, such behavior is related to yielding of amorphous solids, jamming, memory formation, etc. How these phenomena are related to each other has not, however, been much studied. In order to obtain a unified view of the different regimes of behavior, and transitions between them, we investigate computationally the response of soft-sphere assemblies to athermal cyclic-shear deformation over a wide range of densities and amplitudes of shear deformation. Cyclic-shear deformation induces transitions from reversible to irreversible behavior in both unjammed and jammed soft-sphere packings. Well above the minimum isotropic jamming density (ϕJ), this transition corresponds to yielding. In the vicinity of the jamming point, up to a higher-density limit, we designate ϕJcyc, an unjammed phase emerges between a localized, absorbing phase and a diffusive, irreversible, phase. The emergence of the unjammed phase signals the shifting of the jamming point to higher densities as a result of annealing and opens a window where shear jamming becomes possible for frictionless packings. Below ϕJ, two distinct localized states, termed point- and loop-reversible, are observed. We characterize in detail the different regimes and transitions between them and obtain a unified density-shear amplitude phase diagram.

scholarly journals The role of annealing in determining the yielding behavior of glasses under cyclic shear deformation

2021 ◽  
Vol 118 (16) ◽  
pp. e2100227118
Author(s):  
Himangsu Bhaumik ◽  
Giuseppe Foffi ◽  
Srikanth Sastry
Keyword(s):  
Shear Deformation ◽  
Strain Amplitude ◽  
Threshold Energy ◽  
Cyclic Shear ◽  
Annealing Regime ◽  
Uniform Shear ◽  
High Annealing ◽  
Wide Range ◽  
Yielding Behavior

Yielding behavior in amorphous solids has been investigated in computer simulations using uniform and cyclic shear deformation. Recent results characterize yielding as a discontinuous transition, with the degree of annealing of glasses being a significant parameter. Under uniform shear, discontinuous changes in stresses at yielding occur in the high annealing regime, separated from the poor annealing regime in which yielding is gradual. In cyclic shear simulations, relatively poorly annealed glasses become progressively better annealed as the yielding point is approached, with a relatively modest but clear discontinuous change at yielding. To understand better the role of annealing on yielding characteristics, we perform athermal quasistatic cyclic shear simulations of glasses prepared with a wide range of annealing in two qualitatively different systems—a model of silica (a network glass) and an atomic binary mixture glass. Two strikingly different regimes of behavior emerge. Energies of poorly annealed samples evolve toward a unique threshold energy as the strain amplitude increases, before yielding takes place. Well-annealed samples, in contrast, show no significant energy change with strain amplitude until they yield, accompanied by discontinuous energy changes that increase with the degree of annealing. Significantly, the threshold energy for both systems corresponds to dynamical cross-over temperatures associated with changes in the character of the energy landscape sampled by glass-forming liquids.

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