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مکانیک::
آرایش مرجع
Consider an elementary tetrahedron in the reference configuration (Fig. 7.1) such that its vertices P0, Q0,
Now suppose that the material in the volume element P0Q0R0 S0 has mass 8m in the reference configuration.
For a given tensor C this determines an extension ratio A for each set of direction cosines As in the reference configuration.
three of whose faces are normal to the coordinate axes in the reference configuration, it can be shown that the traction f (N) (measured per unit area in the reference configuration) on a ma- terial surface which has unit normal N in the reference configura- tion is given by
By considering the resultant surface and body forces on an arbit- rary region of a body, and referred to the body in its reference configuration, the equations of motion can be expressed in the form
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