The role of shear in the transition from continuous shear thickening to discontinuous shear thickening

2015 ◽  
Vol 106 (15) ◽  
pp. 151902 ◽  
Author(s):  
Weifeng Jiang ◽  
Shouhu Xuan ◽  
Xinglong Gong
Keyword(s):  
Shear Thickening ◽  
Continuous Shear

scholarly journals Hydrodynamic and Contact Contributions to Continuous Shear Thickening in Colloidal Suspensions

2015 ◽  
Vol 115 (22) ◽  
Author(s):  
Neil Y. C. Lin ◽  
Ben M. Guy ◽  
Michiel Hermes ◽  
Chris Ness ◽  
Jin Sun ◽  
...  
Keyword(s):  
Shear Thickening ◽  
Colloidal Suspensions ◽  
Continuous Shear

scholarly journals The Essential Role of Frictional Contact in Shear Thickening

2014 ◽  
Vol 28 (3) ◽  
pp. 296-303
Author(s):  
Ryohei SETO ◽  
Romain MARI ◽  
Jeffrey F. MORRIS ◽  
Morton M. DENN
Keyword(s):  
Essential Role ◽  
Frictional Contact ◽  
Shear Thickening

On the Cutting of Metals: A Mechanics Viewpoint

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
Dinakar Sagapuram ◽  
Anirudh Udupa ◽  
Koushik Viswanathan ◽  
James B. Mann ◽  
Rachid M’Saoubi ◽  
...  
Keyword(s):  
Plastic Flow ◽  
Chip Formation ◽  
Metal Cutting ◽  
Large Strain ◽  
Shear Banding ◽  
Continuous Shear ◽  
Recent Developments ◽  
Flow Phenomena ◽  
The Stability

Abstract The mechanics of large-strain deformation in cutting of metals is discussed, primarily from viewpoint of recent developments in in situ analysis of plastic flow and microstructure characterization. It is shown that a broad range of deformation parameters can be accessed in chip formation—strains of 1–10, strain rates of 10–105/s, and temperatures up to 0.7Tm—and controlled. This range is far wider than achievable by any other single-stage, severe plastic deformation (SPD) process. The resulting extreme deformation conditions produce a rich variety of microstructures in the chip. Four principal types of chip formation—continuous, shear-localized, segmented, and mushroom-type—as elucidated first by Nakayama (1974, “The Formation of ‘Saw-Toothed Chip’ in Metal Cutting,” Proceedings of International Conference on Production Engineering, Tokyo, pp. 572–577) are utilized to emphasize the diverse plastic flow phenomena, especially unsteady deformation modes that prevail in cutting. These chip types are intimately connected with the underlying flow, each arising from a distinct mode and triggered by an instability phenomenon. The role of plastic flow instabilities such as shear banding, buckling, and fracture in mediating unsteady flow modes is expounded, along with consequences of the flow modes and chip types for the cutting. Sinuous flow is shown to be the reason why gummy (highly strain-hardening) metals, although relatively soft, are so difficult to cut. Synthesizing the various observations, a hypothesis is put forth that it is the stability of flow modes that determines the mechanics of cutting. This leads to a flow-stability phase diagram that could provide a framework for predicting chip types and process attributes.

Continuous Shear Thickening and Colloid Surfaces

1996 ◽  
Vol 77 (22) ◽  
pp. 4660-4663 ◽  
Author(s):  
J. R. Melrose ◽  
J. H. van Vliet ◽  
R. C. Ball
Keyword(s):  
Shear Thickening ◽  
Continuous Shear

scholarly journals Role of Characteristics of External Mechanical Stress and Substrate on the Characteristics of Insulin Aggregates

2018 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Mechanical Stress ◽  
Shear Force ◽  
Chemical Nature ◽  
Secondary Structures ◽  
Random Coil ◽  
Adsorbed Protein ◽  
Continuous Shear ◽  
Α Helix ◽  
Β Sheet

The role of chemical nature of the surface and mechanical stress on the properties of insulin in solution kept in the container is explored. The mechanical stress can be applied in the form of shear force or shaking of content in vials. The process of shear can be continuous or intermittent periodic stoppage of shear. We have observed the secondary structures of insulin present over the surface and in the solution. In addition, we have observed the distribution of insulin size, which arises due to their aggregation in solution. The properties are found to depend on the processes of applying mechanical force on a solution. The conversions of α-helix to β-sheet for continuous shear, but to intermolecular β-sheet in presence of the interrupted shear are found. The later phenomenon leads to the formation of a bigger particle. The shaking of the content of vials leads to the formation of particles with the higher random coil. The combined effect of shaking and chemical nature of surface on the aggregates’ properties is also observed. The size distribution and secondary structures of aggregates of insulin in solution are strongly dependent on the chemical nature of the surface. These are explained through desorption of the adsorbed protein. The higher rate desorption of protein from lesser hydrophobic surfaces leads to the formation of bigger insulin aggregates.

Shear Thickening of Concentrated Suspensions: Recent Developments and Relation to Other Phenomena

2020 ◽  
Vol 52 (1) ◽  
pp. 121-144 ◽  
Author(s):  
Jeffrey F. Morris
Keyword(s):  
Shear Thickening ◽  
Contact Forces ◽  
Concentrated Suspensions ◽  
Solid Deformation ◽  
Dense Suspensions ◽  
Recent Developments ◽  
Extreme Change ◽  
Thickening Behavior ◽  
Relationship Of

Shear thickening is the increase of the apparent viscosity as shear rate or shear stress increases. This phenomenon is pronounced in concentrated (dense) suspensions of both colloidal-scale and larger particles, with an abrupt form, known as discontinuous shear thickening, observed as the maximum flowable solid fraction is approached. An overview of observed shear thickening behavior is presented, with a discussion of present understanding of the relationship of suspension shear thickening to granular jamming. Mechanistic arguments for the extreme change in rheological properties are outlined, and recent evidence from experiment and simulation for the role of contact forces is presented. Interactions of particles by fluid mechanical lubrication, contact, and steric and electrostatic forces, together with extreme stresses that may lead to solid deformation, require consideration of surface interactions and their tribological consequences in describing shear thickening.

scholarly journals Role of particle orientational order during shear thickening in suspensions of colloidal rods

2020 ◽  
Vol 101 (4) ◽  
Author(s):  
Vikram Rathee ◽  
Srishti Arora ◽  
Daniel L. Blair ◽  
Jeffrey S. Urbach ◽  
A. K. Sood ◽  
...  
Keyword(s):  
Orientational Order ◽  
Shear Thickening ◽  
Colloidal Rods

Tuning the Rheology of Nano-Sized Silica Suspensions with Silicon Nitride Particles

2019 ◽  
Vol 56 ◽  
pp. 63-70 ◽  
Author(s):  
Selim Gürgen
Keyword(s):  
Silicon Nitride ◽  
Shear Rate ◽  
Shear Thickening ◽  
Critical Shear Rate ◽  
Rheological Measurements ◽  
Additive Particles ◽  
Thickening Behavior ◽  
Silica Suspensions ◽  
Nanosized Silica

In this paper, a non-Newtonian fluid was fabricated dispersing nanosized silica particles in a polyethylene glycol medium. The rheology of the suspension was investigated in a stress-controlled rheometer under increasing shear rate. Based on the rheological measurements, the suspension exhibited shear thickening behavior which gives a drastic viscosity grow with the increase in the shear rate. In order to investigate the role of the micro-sized additive particles on the rheology of silica based suspension, silicon nitride particles were included in the suspension with three different concentrations. The results were discussed in terms of important parameters for the shear thickening mechanism such as critical shear rate, peak viscosity, thickening ratio and initial viscosity. According to the results, shear thickening behavior can be controlled altering the amount of silicon nitride particles in the suspension.

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