An Evaluation of the Plane Strain Compression Test. III. Experimental Study of the Friction Test: The Role of the Metallurgical Parameters of Die and Sheet

1982 ◽  
Vol 104 (4) ◽  
pp. 538-544 ◽  
Author(s):  
F. Delamare ◽  
J. Kubie´
Keyword(s):  
Experimental Study ◽  
Shear Stress ◽  
Chemical Nature ◽  
Marked Effect ◽  
Friction Test ◽  
Good Reliability ◽  
Plane Strain Compression Test ◽  
Kinetics Of Formation ◽  
Kinetics Of

This paper deals with the influence of the metallurgical parameters of dies and sheet on the friction shear-stress which could be measured by P.S.C.T. The metallurgical parameters of the dies have a marked effect on the kinetics of formation of transfer layers. The metallurgical parameters of the sheet have an effect both on the kinetics of formation, and the chemical nature of the transfer layers. Many parameters must be controlled to have good reliability in PSCT. Then the results can be correlated with boundary lubrication in cold rolling.

Role of ionic strength in the kinetics of formation of the monochelate of nickel(II) with heptane-3,5-dione

1992 ◽  
Vol 24 (4) ◽  
pp. 359-368 ◽  
Author(s):  
María Luisa Moyá ◽  
Amalia Rodriguez ◽  
Francisco Sánchez ◽  
Carlos Blanco ◽  
Michael J. Hynes
Keyword(s):  
Ionic Strength ◽  
Kinetics Of Formation ◽  
Kinetics Of

scholarly journals Studies on Pitting Corrosion of Al–Cu–Li Alloys Part III: Passivation Kinetics of AA2098–T851 Based on the Point Defect Model

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1912 ◽  
Author(s):  
Elmira Ghanbari ◽  
Alireza Saatchi ◽  
Xiaowei Lei ◽  
Digby D. Macdonald
Keyword(s):  
Barrier Layer ◽  
Potential Model ◽  
Electrochemical Impedance ◽  
Passive Layer ◽  
Charge Carriers ◽  
Theoretical Interpretation ◽  
Defect Model ◽  
Kinetics Of Formation ◽  
Kinetics Of

In this paper, the passivation kinetics of AA2098–T851 was investigated by a fundamental theoretical interpretation of experimental results based on the mixed potential model (MPM). The steady state passive layer formed on the AA2098–T851 in NaHCO3 solution in a CO2 atmosphere upon potentiostatic stepping in the anodic direction followed by stepping in the opposite direction was explored. Potentials were selected in a way that both anodic passive dissolution of the metal and hydrogen evolution reaction (HER) occur, thereby requiring the MPM for interpretation. Optimization of the MPM on the experimental electrochemical impedance spectroscopy (EIS) data measured after each potentiostatic step revealed the important role of the migration of Al interstitials in determining the kinetics of passive layer formation and dissolution. More importantly, it is shown that the inequalities of the kinetics of formation and dissolution of the passive layer as observed in opposite potential stepping directions lead to the irreversibility of the passivation process. Finally, by considering the Butler–Volmer (B–V) equation for the cathodic reaction (HER) in the MPM, and assuming the quantum mechanical tunneling of the charge carriers across the barrier layer of the passive film, it was shown that the HER was primarily controlled by the slow electrochemical discharge of protons at the barrier layer/solution (outer layer) interface.

scholarly journals A computational and experimental study inside microfluidic systems: the role of shear stress and flow recirculation in cell docking

2010 ◽  
Vol 12 (4) ◽  
pp. 619-626 ◽  
Author(s):  
Margherita Cioffi ◽  
Matteo Moretti ◽  
Amir Manbachi ◽  
Bong Geun Chung ◽  
Ali Khademhosseini ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shear Stress ◽  
Microfluidic Systems ◽  
Flow Recirculation

An Evaluation of the Plane Strain Compression Test. II. Experimental Study of the Friction Test: Role of Transfer Layers in Boundary Lubrication

1982 ◽  
Vol 104 (4) ◽  
pp. 545-551 ◽  
Author(s):  
F. Delamare ◽  
M. De Vathaire ◽  
Jan Kubie´
Keyword(s):  
Shear Stress ◽  
Plane Strain ◽  
Compression Test ◽  
Film Formation ◽  
Transfer Film ◽  
Plane Strain Compression ◽  
Plane Strain Compression Test ◽  
Shear Stress Level ◽  
The Mean

The Plane Strain Compression Test is used to measure the mean friction shear stress at the sheet-die interfaces. It is found that the shear-stress level is strongly influenced by transfer film formation on the dies. The thickness of these films, and their elementary chemical composition, have been determined by Auger Electron Spectroscopy and rugosimetry. The effect of contact mechanics and lubricant parameters on transfer film formation is discussed.

The Kinetics of Formation Of Nanocrystalline γ-Ni-Fe During Mechano-Chemical Synthesis

1999 ◽  
Vol 577 ◽  
Author(s):  
P. Knorr ◽  
B.S. Kim ◽  
J.S. Lee
Keyword(s):  
Solid Solution ◽  
Experimental Study ◽  
Chemical Synthesis ◽  
Reaction Rates ◽  
Kinetics Of Formation ◽  
Kinetics Of

ABSTRACTAn experimental study of the kinetics of the three partial processes involved in the mechano-chemical synthesis of nanocrystalline (nc) Ni-Fe is presented. These processes are the reduction of nc NiO, the reduction of nc Fe2O3, and the alloying of Ni and Fe to a γ-Ni-Fe solid solution. Fr the reaction rates of the reduction of nc NiO and nc Fe2O3 activation enthalpies of 82 kJ mol−1 and 47 kJ mol− were obtained. The progress of the overall synthesis was found to follow the sequence ‘NiO red. → Fe2O3 red. → γ-Ni-Fe form.’.

Kinetics of Formation and Dissolution of Weak Polyelectrolyte Multilayers:  Role of Salt and Free Polyions

Langmuir ◽  
2002 ◽  
Vol 18 (14) ◽  
pp. 5607-5612 ◽  
Author(s):  
D. Kovacevic ◽  
S. van der Burgh ◽  
A. de Keizer ◽  
M. A. Cohen Stuart
Keyword(s):  
Polyelectrolyte Multilayers ◽  
Kinetics Of Formation ◽  
Kinetics Of
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