scholarly journals Plastic deformation treated as material flow through adjustable crystal lattice

2014 ◽  
Vol 63 ◽  
pp. 012130 ◽  
Author(s):  
P Minakowski ◽  
J Hron ◽  
J Kratochvíl ◽  
M Kružík ◽  
J Málek
Keyword(s):  
Plastic Deformation ◽  
Crystal Lattice ◽  
Material Flow ◽  
Flow Through

scholarly journals Possible Chromatographie Effect of Liquid-Crystalline Permeation

1973 ◽  
Vol 28 (12) ◽  
pp. 1967-1968 ◽  
Author(s):  
W. Helfrich
Keyword(s):  
Material Flow ◽  
Liquid Crystalline ◽  
Permeation Rate ◽  
Flow Through

Permeation, i. e. material flow through cholesteric and smectic layers, may vary in speed for the components of a mixture. We derive qualitative formulas for the permeation rate of solute molecules in cholesterics as a function of their size. The possibility of a new kind of chromatography based on permeation in cholesterics or smectics is discussed.

Crystal Lattice Distorsions in Ultrafine-Grained Metals Produced by Severe Plastic Deformation

2000 ◽  
pp. 127-132 ◽  
Author(s):  
A. N. Tyumentsev ◽  
M. V. Tretiak ◽  
A. D. Korotaev ◽  
Yu. P. Pinzhin ◽  
R. Z. Valiev ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Crystal Lattice ◽  
Ultrafine Grained

Parallel Extrusion of Aluminum Alloy Heat Sink with Round-Fin

2013 ◽  
Vol 739 ◽  
pp. 131-135
Author(s):  
Li Han Zhang ◽  
Ke Sheng Wang ◽  
Yu Han ◽  
Jia Yu Ying
Keyword(s):  
Heat Sink ◽  
Material Flow ◽  
Extrusion Process ◽  
Element Analysis ◽  
Automotive Lighting ◽  
Metal Sheets ◽  
The Finite Element Analysis ◽  
Alloy Heat ◽  
Flow Through ◽  
Good Agreement

Parallel extrusion is a combined extrusion process for forming round-fin heat sink on thick metal sheets. In this paper, the parallel extrusion has been applied to manufacture the round-fin heat sink in the automotive lighting. Numerical simulations on the round-fin heat sink forming using the software DEFORM were carried out. The tooling structure with counterpressure on the heat sink formation was investigated. The results show that the tooling structure with counterpressure is helpful to the formation of round-fin heat sink, which not only ensures the height of each round-fin on the heat sink is uniform but also retards the initiation of flow-through on the reverse side of round-fin. In addition, the experiments of press forging process were conducted to validate the finite element analysis, it is shown that the friction at the punch-blank interface has more significant effect on preventing the initiation of flow-through compared with the friction at the die-blank interface, which implies that the punch-blank interface has more significant effect on the material flow in the formation of round-fin, and the simulation results are in good agreement with the experimental data.

Characterization of Plastic Deformation Induced by Microscale Laser Shock Peening

2004 ◽  
Vol 71 (5) ◽  
pp. 713-723 ◽  
Author(s):  
Hongqiang Chen ◽  
Jeffrey W. Kysar ◽  
Y. Lawrence Yao
Keyword(s):  
Plastic Deformation ◽  
Single Crystal ◽  
Crystal Lattice ◽  
Electron Backscatter Diffraction ◽  
Fem Analysis ◽  
Copper Sample ◽  
Laser Shock Peening ◽  
Lattice Rotation ◽  
Laser Shock ◽  
Shock Peening

Electron backscatter diffraction (EBSD) is used to investigate crystal lattice rotation caused by plastic deformation during high-strain rate laser shock peening in single crystal aluminum and copper sample on 110¯ and (001) surfaces. New experimental methodologies are employed which enable measurement of the in-plane lattice rotation under approximate plane-strain conditions. Crystal lattice rotation on and below the microscale laser shock peened sample surface was measured and compared with the simulation result obtained from FEM analysis, which account for single crystal plasticity. The lattice rotation measurements directly complement measurements of residual strain/stress with X-ray micro-diffraction using synchrotron light source and it also gives an indication of the extent of the plastic deformation induced by the microscale laser shock peening.

Applying Lean Manufacturing Principles to Revolutionize Cubrside Equipment and Collection Processes

2007 ◽  
Author(s):  
Edward W. Smith ◽  
P. Judson Johnston ◽  
Joshua D. Summers
Keyword(s):  
Material Flow ◽  
Lean Manufacturing ◽  
Value Added ◽  
Manufacturing Companies ◽  
Production Flow ◽  
Environmentally Conscious ◽  
Collection Process ◽  
Flow Through ◽  
Similar Vein ◽  
Environmentally Conscious Design

The application of lean manufacturing principles has improved the production flow of manufacturing companies across the globe. In a similar vein, environmentally conscious design has been an increasingly important avenue of research which similarly seeks to reduce waste and thereby mitigate environmental impact. An analysis of the curbside municipal solid waste (MSW) and recycling collection process from a lean manufacturing standpoint reveals numerous non-value added activities which can be eliminated or reduced and value-added activities which can be made more efficient. Environmental America Inc. (EAI) has proposed a collection process which will improve the overall material flow through the use of a collection vehicle specializing in the combined collection of raw waste and recyclable waste. This collection vehicle, combined with localized, low-impact material offloading facilities has the potential to revolutionize the curbside collection process. Our research supports this vision by configuring the truck layout and process operations, as discussed in this paper.

scholarly journals Investigating the Mechanics of Hybrid Metal Extrusion and Bonding Additive Manufacturing by FEA

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 811 ◽  
Author(s):  
Jørgen Blindheim ◽  
Torgeir Welo ◽  
Martin Steinert
Keyword(s):  
Additive Manufacturing ◽  
Material Flow ◽  
Deposition Process ◽  
Feed Speed ◽  
Element Analysis ◽  
Reduced Pressure ◽  
Metal Structures ◽  
Material Deposition ◽  
Flow Through ◽  
Metal Extrusion

Hybrid Metal Extrusion & Bonding Additive Manufacturing (HYB-AM) is a hybrid manufacturing technology for the deposition of layered metal structures. This new deposition process is a complex metal forming operation, yet there is significant lack of knowledge regarding the governing mechanisms. In this work, we have used finite element analysis (FEA) to study material flow in the extruder, as well as the conditions at the interfaces of the deposited extrudate and the substrate, aiming to identify and characterize the process parameters involved. Analysis of the material flow shows that the extrusion pressure is virtually independent of the deposition rate. Furthermore, from the simulations of the material deposition sequence, it is clearly visible how the contact pressure at the interface will drop below the bonding threshold if the feed speed is too high relative to the material flow through the die. The reduced pressure also leads to the formation of a ‘gas-pocket’ inside the die, thus further degrading the conditions for bonding. The analyses of the process have provided valuable insights for the further development and industrialization of the process.

Press Forging Forming of the Round-Fin on Heat Sink

2013 ◽  
Vol 706-708 ◽  
pp. 448-451
Author(s):  
Chong Chao Lin ◽  
Ke Sheng Wang ◽  
Yu Han ◽  
Li Han Zhang
Keyword(s):  
Friction Coefficient ◽  
Friction Factor ◽  
Heat Sink ◽  
Material Flow ◽  
Extrusion Process ◽  
Metal Sheets ◽  
Flow Through ◽  
Good For

Press forging forming is a combined extrusion process for forming round-fin on heat sink on thick metal sheets. A series of simulations on the round-fin forming using the program DEFORM were carried out. The blank thickness and friction coefficient on the formation of round-fin were studied. The results show that the blank thickness is very good for the round-fin formation, and the thicker the blank is, the better the round-fin can be formed; and also when both the punch-blank interface and the die-blank interface have the same value of friction factor, the larger value of friction factor is in favor of round-fin forming, the further investigation reveals that the friction at the punch-blank interface has more significant effect on preventing the initiation of flow-through compared with the friction at the die-blank interface, which implies that the punch-blank interface has more significant effect on the material flow in the formation of round-fin.

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