Normal stress can be total or effective but why the same does not apply to shear stress.
Why don't we use total and effective shear stresses?
Howdy Faseel Suleman Kahn,
This may open a path of exploration for you:
Buscombe, D., and D. C. Conley (2012), Effective shear stress of graded sediments, Water Resour. Res., 48, W05506,
doi:10.1029/2010WR010341.
"We define the quantity
effective shear stress, e, as the stress applied by the flow
on the bed which is expended on processes other than mobilization of sediment."
Happy Trails, Len
Howdy Caleb Onah,
". . . the frictional properties of the materials involved." Agreed. With water in the pores the material grains of the soil are more weakly bound and the soil shears more easily. Consider "mud" and the dry soil from which it came as an obvious example. To refer to the change as effective shear stress (Buscombe and Conley, 2012) apparently introduces the concept, but there it is.
Happy Trails,
Len
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