We know that the velocity gradient  L = F'F-1      [ F ' is the time derivative of F ]

 

Using multiplicative decomposition, F =FeFp

we have , L = F'eFe -1 + Fe F'p Fp -1 Fe -1 = Le + Fe Lp Fe -1

Each of the above velocity gradients ( Le &  Fe Lp Fe-1) could be decomposed into corresponding stretch and spin tensors as

Le = De + We

Fe Lp Fe-1 = Dp + Wp

Questions :

1) How do we intuitively understand We , Dp and Wp

2) Can we say that skew-symmetric part of Lp alone is ZERO , since there is no rotation involved  in the intermediate configuration  ?

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