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  2. Severe plastic deformation - Wikipedia

    en.wikipedia.org/wiki/Severe_Plastic_Deformation

    Severe plastic deformation ... creating a strain rate on the order of 10 2 –10 3 s −1. ... (Q p is the activation energy for pipe diffusion along dislocations, ...

  3. Shear rate - Wikipedia

    en.wikipedia.org/wiki/Shear_rate

    The shear rate at the inner wall of a Newtonian fluid flowing within a pipe [2] is ˙ =, where: ˙ is the shear rate, measured in reciprocal seconds; v is the linear fluid velocity; d is the inside diameter of the pipe.

  4. Flow plasticity theory - Wikipedia

    en.wikipedia.org/wiki/Flow_plasticity_theory

    Plastic deformation of a thin metal sheet. Flow plasticity is a solid mechanics theory that is used to describe the plastic behavior of materials. [1] Flow plasticity theories are characterized by the assumption that a flow rule exists that can be used to determine the amount of plastic deformation in the material.

  5. Strain-rate tensor - Wikipedia

    en.wikipedia.org/wiki/Strain-rate_tensor

    A two-dimensional flow that, at the highlighted point, has only a strain rate component, with no mean velocity or rotational component. In continuum mechanics, the strain-rate tensor or rate-of-strain tensor is a physical quantity that describes the rate of change of the strain (i.e., the relative deformation) of a material in the neighborhood of a certain point, at a certain moment of time.

  6. Creep (deformation) - Wikipedia

    en.wikipedia.org/wiki/Creep_(deformation)

    The rate of deformation is a function of the material's properties, ... materials experience plastic deformation rather than creep. ... pipes carry steam at high ...

  7. Strain rate - Wikipedia

    en.wikipedia.org/wiki/Strain_rate

    The definition of strain rate was first introduced in 1867 by American metallurgist Jade LeCocq, who defined it as "the rate at which strain occurs. It is the time rate of change of strain." In physics the strain rate is generally defined as the derivative of the strain with respect to time. Its precise definition depends on how strain is measured.

  8. Plasticity (physics) - Wikipedia

    en.wikipedia.org/wiki/Plasticity_(physics)

    Plastic materials that have been hardened by prior deformation, such as cold forming, may need increasingly higher stresses to deform further. Generally, plastic deformation is also dependent on the deformation speed, i.e. higher stresses usually have to be applied to increase the rate of deformation.

  9. Bingham plastic - Wikipedia

    en.wikipedia.org/wiki/Bingham_plastic

    Figure 1. Bingham Plastic flow as described by Bingham. Figure 1 shows a graph of the behaviour of an ordinary viscous (or Newtonian) fluid in red, for example in a pipe. If the pressure at one end of a pipe is increased this produces a stress on the fluid tending to make it move (called the shear stress) and the volumetric flow rate increases proportionally.