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Micromechanics of composites/Average velocity gradient in a RVE

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Average velocity gradient in a RVE

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The time rate of the deformation gradient is given by

The average time rate of the deformation gradient is defined as

Following the same procedure as in the previous section, we can show that

The velocity gradient () is given by

where is the velocity.

The average velocity gradient in a RVE is defined as

Note that only if .