Initial Deformation Process in Granular Matter

2004 ◽  
Author(s):  
So Kitsunezaki
Keyword(s):  
Deformation Process ◽  
Granular Matter ◽  
Initial Deformation

Comparison of Substructures Between Uniaxial and Biaxial Deformation in 1100-0 Aluminum

1981 ◽  
Vol 39 ◽  
pp. 52-53
Author(s):  
D. L. Rohr ◽  
S. S. Hecker
Keyword(s):  
Plastic Strain ◽  
Cell Walls ◽  
Room Temperature ◽  
Mechanical Response ◽  
Biaxial Tension ◽  
Initial Deformation ◽  
Uniaxial Deformation ◽  
Biaxial Deformation ◽  
Stress States ◽  
Comprehensive Study

As part of a comprehensive study of microstructural and mechanical response of metals to uniaxial and biaxial deformations, the development of substructure in 1100 A1 has been studied over a range of plastic strain for two stress states.Specimens of 1100 aluminum annealed at 350 C were tested in uniaxial (UT) and balanced biaxial tension (BBT) at room temperature to different strain levels. The biaxial specimens were produced by the in-plane punch stretching technique. Areas of known strain levels were prepared for TEM by lapping followed by jet electropolishing. All specimens were examined in a JEOL 200B run at 150 and 200 kV within 24 to 36 hours after testing.The development of the substructure with deformation is shown in Fig. 1 for both stress states. Initial deformation produces dislocation tangles, which form cell walls by 10% uniaxial deformation, and start to recover to form subgrains by 25%. The results of several hundred measurements of cell/subgrain sizes by a linear intercept technique are presented in Table I.

Principle of Accuracy Calculation of Measurements during Deformation Process Monitoring

2019 ◽  
Vol 14 (1) ◽  
pp. 59-66
Author(s):  
Yu.I. Pimshin ◽  
Yu.V. Zayrov ◽  
G.A. Naumenko
Keyword(s):  
Process Monitoring ◽  
Deformation Process

Automated system for work preparation of parts production by sheet stamping

2020 ◽  
pp. 108-114
Author(s):  
L.R. Kashapova ◽  
D.L. Pankratov ◽  
V.G. Shibakov
Keyword(s):  
Deformation Process ◽  
Automated System ◽  
Tool Performance ◽  
Sheet Stamping ◽  
Mechanical And Physical Properties ◽  
Preparation Stage ◽  
Process Reliability ◽  
Recurrent Defects ◽  
Automated Process ◽  
Reliability Performance

The procedure of automated process reliability evaluation is developed in order to prevent recurrent defects in parts manufactured by die stamping. The procedure is based on the analysis of such factors as part design, material, its mechanical and physical properties; equipment parameters, tool performance, etc. The list of reliability factors may vary according to type of operation as deformation process is different for each group of operations. The adjustment of stamping process reliability performance prevents any defects emerging during production of critical parts as early as the work preparation stage.

scholarly journals Continuously Sheared Granular Matter Reproduces in Detail Seismicity Laws

2019 ◽  
Vol 122 (21) ◽  
Author(s):  
S. Lherminier ◽  
R. Planet ◽  
V. Levy dit Vehel ◽  
G. Simon ◽  
L. Vanel ◽  
...  
Keyword(s):  
Granular Matter

scholarly journals Un-jamming due to energetic instability: statics to dynamics

2021 ◽  
Vol 23 (4) ◽  
Author(s):  
Stefan Luding ◽  
Yimin Jiang ◽  
Mario Liu
Keyword(s):  
Granular Matter ◽  
Numerical Data ◽  
Soft Materials ◽  
Material Point ◽  
Solid States ◽  
Granular Gas ◽  
Granular Solid Hydrodynamics ◽  
Particle Simulations ◽  
Points Of View ◽  
Deformation Modes

Abstract Jamming/un-jamming, the transition between solid- and fluid-like behavior in granular matter, is an ubiquitous phenomenon in need of a sound understanding. As argued here, in addition to the usual un-jamming by vanishing pressure due to a decrease of density, there is also yield (plastic rearrangements and un-jamming that occur) if, e.g., for given pressure, the shear stress becomes too large. Similar to the van der Waals transition between vapor and water, or the critical current in superconductors, we believe that one mechanism causing yield is by the loss of the energy’s convexity (causing irreversible re-arrangements of the micro-structure, either locally or globally). We focus on this mechanism in the context of granular solid hydrodynamics (GSH), generalized for very soft materials, i.e., large elastic deformations, employing it in an over-simplified (bottom-up) fashion by setting as many parameters as possible to constant. Also, we complemented/completed GSH by using various insights/observations from particle simulations and calibrating some of the theoretical parameters—both continuum and particle points of view are reviewed in the context of the research developments during the last few years. Any other energy-based elastic-plastic theory that is properly calibrated (top-down), by experimental or numerical data, would describe granular solids. But only if it would cover granular gas, fluid, and solid states simultaneously (as GSH does) could it follow the system transitions and evolution through all states into un-jammed, possibly dynamic/collisional states—and back to elastically stable ones. We show how the un-jamming dynamics starts off, unfolds, develops, and ends. We follow the system through various deformation modes: transitions, yielding, un-jamming and jamming, both analytically and numerically and bring together the material point continuum model with particle simulations, quantitatively. Graphic abstract

scholarly journals Effect of viscosity on the avalanche dynamics and flow transition of wet granular matter

Particuology ◽  
2021 ◽  
Author(s):  
Jens H. Kasper ◽  
Vanessa Magnanimo ◽  
Sjoerd D.M. de Jong ◽  
Arjan Beek ◽  
Ahmed Jarray
Keyword(s):  
Granular Matter ◽  
Flow Transition ◽  
Avalanche Dynamics

scholarly journals Granular matter under microgravity

2008 ◽  
Vol 39 (4) ◽  
pp. 28-30
Author(s):  
P. Evesque ◽  
Y. Garrabos ◽  
A. Garcimartin ◽  
N. Vandewalle ◽  
D. Beysens
Keyword(s):  
Granular Matter
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