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In continuum mechanics, the strain-rate te … In continuum mechanics, the strain-rate tensor or rate-of-strain tensor is a physical quantity that describes the rate of change of the deformation of a material in the neighborhood of a certain point, at a certain moment of time. It can be defined as the derivative of the strain tensor with respect to time, or as the symmetric component of the Jacobian matrix (derivative with respect to position) of the flow velocity. In fluid mechanics it also can be described as the velocity gradient, a measure of how the velocity of a fluid changes between different points within the fluid. Though the term can refer to the differences in velocity between layers of flow in a pipe, it is often used to mean the gradient of a flow's velocity with respect to its coordinates. The concept has implications in a variety of areas of physics and engineering, including magnetohydrodynamics, mining and water treatment. The strain rate tensor is a purely kinematic concept that describes the macroscopic motion of the material. Therefore, it does not depend on the nature of the material, or on the forces and stresses that may be acting on it; and it applies to any continuous medium, whether solid, liquid or gas. On the other hand, for any fluid except superfluids, any gradual change in its deformation (i.e. a non-zero strain rate tensor) gives rise to viscous forces in its interior, due to friction between adjacent fluid elements, that tend to oppose that change. At any point in the fluid, these stresses can be described by a viscous stress tensor that is, almost always, completely determined by the strain rate tensor and by certain intrinsic properties of the fluid at that point. Viscous stress also occur in solids, in addition to the observed in static deformation; when it is too large to be ignored, the material is said to be viscoelastic., the material is said to be viscoelastic.
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Scalar part
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, Symmetric part
, Non-linear residual
, Traceless part
, A velocity field
, Constant part
, Linear part
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The antisymmetric part of the linear term.
, Total field .
, The deviatoric part of the strain rate tensor .
, Constant part .
, The symmetric part of the linear term of the example flow.
, The spherical part of the strain rate tensor .
, Non-linear residual.
, Linear part .
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vertical
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The velocity field of an arbitrary flow around a point , at some instant , and the terms of its first-order Taylor approximation about . The third component of the velocity is assumed to be zero everywhere.
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| rdfs:comment |
In continuum mechanics, the strain-rate te … In continuum mechanics, the strain-rate tensor or rate-of-strain tensor is a physical quantity that describes the rate of change of the deformation of a material in the neighborhood of a certain point, at a certain moment of time. It can be defined as the derivative of the strain tensor with respect to time, or as the symmetric component of the Jacobian matrix (derivative with respect to position) of the flow velocity. In fluid mechanics it also can be described as the velocity gradient, a measure of how the velocity of a fluid changes between different points within the fluid. Though the term can refer to the differences in velocity between layers of flow in a pipe, it is often used to mean the gradient of a flow's velocity with respect to its coordinates. The concept has implications in rdinates. The concept has implications in
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Strain-rate tensor
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