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                           مکانیک:: 
                            المان حجم
                        
                        We first  consider  the  effect  of  a  finite deformation  on a  volume  element.
Deformation of a volume element.
Figure 7.1 Deformation  of  a  volume element
Now suppose that the material in the volume element P0Q0R0 S0 has mass 8m in  the reference configuration.
Conservation  of  mass  requires  that  the mass  of  the  material  in  the  material  volume  element remains
 
                        
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