(principal stress tensor)

and a special case of this is the so-called "hydrostatic" stress system with equal principal stresses in all three directions, i.e. o\ = o2 = 03 = ër, and the tensor becomes:

As shown in §23.16 it is often convenient to divide a general stress into two parts, one due to a hydrostatic stress a = ^(o\ + o2 + the other due to shearing deformations.

Another convenient tensor notation is therefore that for pure shear, ie oxx = oyy = azz = 0 giving the tensor:

' 0

0 0

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