2.2 TWO-DIMENSIONAL STATE OF STRESSES
It is convenient to presume one of the principal stresses (or stress components in a particular direction) or principal strains (or strain components in a particular direction) as zero and convert the problem to a 2D state. In many occasions, 2D problems are easy to solve.
Thus, in certain situations, the stress components in a particular direction may all be zero and only the components perpendicular to that direction may exist. This is referred to as case of plane stress.
For example, if pz = qxz = qyz = 0 (i.e., all the stress components in the z-direction are zero) and the components px, py and qxy exist, then it is a case of plane stress.
Thus, a state of plane stress may be defined as that condition ...
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