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(2)
II P-K Stress
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is defined in terms of fictitious force
applied
to undeformed surface
.
This force is related to the real force
(applied
to dS) in the same way that a material vector
at
is
related by the deformation to the corresponding spatial vector
at
.
The angle
is
the same
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Or

Next: 4.10(f) Second P-K (final)