Hysteresis and Recovery Length in a Dry Solid Friction Experiment

1997 ◽  
Vol 7 (12) ◽  
pp. 1745-1751 ◽  
Author(s):  
J�r�me Crassous ◽  
Sergio Ciliberto ◽  
Elisabeth Charlaix ◽  
Claude Laroche
Keyword(s):  
Solid Friction

Energy dissipation in solid friction

1999 ◽  
Vol 9 (3) ◽  
pp. 551-558 ◽  
Author(s):  
S. Ciliberto ◽  
C. Laroche
Keyword(s):  
Energy Dissipation ◽  
Solid Friction

scholarly journals RTA Mathematic Simulation Principles at the Autotechnical Expertise

2021 ◽  
Vol 334 ◽  
pp. 02026
Author(s):  
Badrudin Gasanov ◽  
Artem Efimov ◽  
Jurij Grebennikov
Keyword(s):  
Mathematical Model ◽  
Road Transport ◽  
Road Accident ◽  
Momentum Vector ◽  
The Road ◽  
Solid Friction ◽  
Strain Stress ◽  
Determination Methods ◽  
Determine Step ◽  
Energy Conservation Law

The features of carrying out an autotechnical expertise (ATE) are considered in case the vehicles (V) participating in the road transport accident (RTA) don’t leave skid imprints. The examples of momentum and energy conservation law application are given at developing the road accident mathematical model. Special attention is paid to the determination methods of vehicle (V) velocity, travel directions in various RTA diagrams and archeology of deformation. For this purpose it is offered to draw a momentum vector diagram. It is reasonable that for the calculation of V deformation at RTA it is necessary to determine step by step the strain-stress state in a contact area on the basis of the theories of elasticity, plasticity, solid friction and finite-element methods. The technique of constructing an RTA mathematical model is developed. It is recommended to use at ATE of RTAs at the runs-over into the fixed obstacle (a stationary V) and collisions.

Le role de la pression fluide dans les deformations tectoniques

1959 ◽  
Vol S7-I (6) ◽  
pp. 571-573
Author(s):  
Jean Goguel
Keyword(s):  
Lateral Pressure ◽  
Fluid Pressure ◽  
Hydrostatic Equilibrium ◽  
Excess Pressure ◽  
Tectonic Deformation ◽  
Lithostatic Pressure ◽  
Solid Friction

Abstract It has been shown by K. Hubbert and W. W. Rubey that fluid pressure may play an important role in tectonic deformation when it becomes greater than that required for hydrostatic equilibrium. When the impregnating fluid in rock is under such excess pressure, the conditions of solid friction are drastically altered. The limit is reached when fluid pressure becomes equal to lithostatic pressure; rocks could then be displaced freely with respect to one another. Rough calculations show that this limit need not be reached; all overthrusts, whether due to lateral pressure or flow, can take place easily if fluid pressure is 95-98 percent of lithostatic pressure. Possible mechanisms for producing excess pressure are discussed.

Energy-based Solid Friction Model for Combustion Engines

MTZ worldwide ◽  
2016 ◽  
Vol 77 (7-8) ◽  
pp. 70-74
Author(s):  
Jens Hadler ◽  
Christian Lensch-Franzen ◽  
Morten Kronstedt ◽  
Tahsin Doğuer
Keyword(s):  
Friction Model ◽  
Combustion Engines ◽  
Solid Friction

Specific Heat of Tribological Wear Debris Material

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
Maria Maciąg
Keyword(s):  
Specific Heat ◽  
Thermodynamic Model ◽  
Wear Debris ◽  
Friction And Wear ◽  
Mass Conservation ◽  
Phenomenological Approach ◽  
Wear Testing ◽  
Physical Parameters ◽  
Friction Process ◽  
Solid Friction

Stationary processes of solid friction, heating and wear are analyzed in this paper on the basis of the first principle of thermodynamics. Analytical dependences between physical parameters of a tribological system have been determined. Densities of extensive quantity fluxes are referred to elementary surface and elementary time, which has permitted to include intensive quantities, especially temperature, in the model presented here. Although the discussion is restricted to the phenomenological approach, conclusions regarding some microscopic properties of the matter in the process of fragmentation are drawn directly from the laws of energy and mass conservation. Differences between specific heat of the starting material cp and of the debris produced cp′ are emphasized. The model of the friction process described by Maciąg, M. (2010, “Thermodynamic Model of the Metallic Friction Process,” ASME J. Tribol., 132(3), pp. 1–7) has been modified and a new method of evaluating cp′ is proposed. Results of standard friction and wear testing are used to describe selected tribological systems in quantitative terms based on the thermodynamic model discussed here (Sadowski, J., and Żurowski, W., 1992, “Thermodynamic Aspects of Metals' Wear-Resistance,” Tribol. Lubr. Eng., 3, pp. 152–159). Very high specific heat of tribological wear debris material is found at the moment of the material's production. To conclude, results of theoretical and experimental analysis are discussed and their interpretation is proposed. Applicability of the system magnitudes C and D to modeling of friction and wear is highlighted.

Physically Motivated Simulation of Dynamic Hydraulic Seals

2019 ◽  
Author(s):  
Julian Angerhausen ◽  
Hubertus Murrenhoff ◽  
Bo N. J. Persson ◽  
Katharina Schmitz
Keyword(s):  
Total Solid ◽  
Qualitative Comparison ◽  
Theoretical Understanding ◽  
Detailed Understanding ◽  
Solid Friction ◽  
Hydraulic Cylinders ◽  
Machine Elements ◽  
Ring Seal ◽  
Sealing Mechanism ◽  
Oscillating Motion

Abstract Seals are crucial machine elements, for example in hydraulic cylinders. However, especially in regard to dynamic seals, the theoretical understanding of the sealing mechanism is still insufficient. A physically motivated simulation can help to gain a more detailed understanding. In this contribution a elastohydrodynamic (EHD) seal simulation is presented. It is directly implemented in the commercial Software ABAQUS. The fluid film is considered by implementing the Reynolds equation. For a physically motivated simulation Persson’s theory of contact mechanics and rubber friction is used to calculate the solid contribution to the total friction of a hydraulic seal. Simulations for an oscillating motion of a cylinder rod, sealed by an O-ring seal, are carried out for different velocities and pressures. A qualitative comparison between measurement and simulation is provided. Hysteresis effects and the contributions from both, adhesive and viscoelastic friction to the total solid friction are investigated. The physical origin of these effects is discussed in order to provide a detailed understanding of the dynamic sealing mechanism.

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