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  2. Frictional contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Frictional_contact_mechanics

    This theory is exact for the situation of an infinite friction coefficient in which case the slip area vanishes, and is approximative for non-vanishing creepages. It does assume Coulomb's friction law, which more or less requires (scrupulously) clean surfaces. This theory is for massive bodies such as the railway wheel-rail contact.

  3. Friction - Wikipedia

    en.wikipedia.org/wiki/Friction

    Friction is the force resisting the ... Coulomb investigated the influence of four main factors on friction: ... Surface roughness and contact area affect kinetic ...

  4. Friction loss - Wikipedia

    en.wikipedia.org/wiki/Friction_loss

    Jean Le Rond d'Alembert, Nouvelles expériences sur la résistance des fluides, 1777. In fluid dynamics, friction loss (or frictional loss) is the head loss that occurs in a containment such as a pipe or duct due to the effect of the fluid's viscosity near the surface of the containment.

  5. Contact mechanics - Wikipedia

    en.wikipedia.org/wiki/Contact_mechanics

    Frictional contact mechanics emphasizes the effect of friction forces. Contact mechanics is part of mechanical engineering. The physical and mathematical formulation of the subject is built upon the mechanics of materials and continuum mechanics and focuses on computations involving elastic, viscoelastic, and plastic bodies in static or dynamic ...

  6. Minor losses in pipe flow - Wikipedia

    en.wikipedia.org/wiki/Minor_Losses_in_pipe_flow

    Just as certain aspects of the system can increase the fluids energy, there are components of the system that act against the fluid and reduce its energy, velocity, or momentum. Friction and minor losses in pipes are major contributing factors. [1] [2] [3] [4]

  7. Parasitic drag - Wikipedia

    en.wikipedia.org/wiki/Parasitic_drag

    Skin friction drag imparts some momentum to a mass of air as it passes through it and that air applies a retarding force on the body. As with other components of parasitic drag, skin friction follows the drag equation and rises with the square of the velocity. Skin friction is caused by viscous drag in the boundary layer around the object. The ...

  8. Friction torque - Wikipedia

    en.wikipedia.org/wiki/Friction_torque

    In mechanics, friction torque is the torque caused by the frictional force that occurs when two objects in contact move. [1] Like all torques, ...

  9. Fretting - Wikipedia

    en.wikipedia.org/wiki/Fretting

    This may however, also cause the opposite effect as a lower coefficient of friction may lead to more movement. [13] Thus, a solution must be carefully considered and tested. In the aviation industry, coatings are applied to cause a harder surface and/or influence the friction coefficient.