Stress tensor and partial derivatives of a force field

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SUMMARY

The discussion centers on the physical significance of the partial derivatives of a force field, specifically F = Fxi + Fyj + Fzk. The derivatives ∂²Fx/∂x², ∂²Fx/∂y², ∂²Fx/∂z², and their mixed forms are examined. While these derivatives share dimensions with stress, they do not have a direct relationship with the components of the stress tensor. The key conclusion is that the dimensional similarity does not imply a physical connection between the derivatives and the stress tensor.

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If F = Fxi + Fyj +Fzk is a force field, do the following derivatives have physical significance and are they related to the components of the stress tensor? I notice they have the same dimensions as stress.​

2Fx / ∂x2

2Fx / ∂y2

2Fx / ∂z2

2Fx / ∂zy

2Fx / ∂yz

2Fx / ∂zx

2Fx / ∂xz

2Fx / ∂yx

2Fx / ∂xy

The same partial derivatives of Fy and Fz
 
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They have a physical significance in that they tell you something about how the force field changes. They have a priori nothing to do with the stress tensor. That two quantities have the same physical dimension does not imply that they have to be related.
 
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