If the plane strain deformation is occurring parallel to the XY plane, then strain in the z-direction is equal to zero. The stress in the z-direction will be equal to _______________(Given that stress in x and y-direction is x and y respectively).

If the plane strain deformation is occurring parallel to the XY plane,

1.	If the plane strain deformation is occurring parallel to the XY plane, then strain in the z-direction is equal to zero. The stress in the z-direction will be equal to _______________ (Given that stress in x and y-direction is _x and _y respectively).
A.	<sub>x</sub>+ <sub>y</sub>
B.	( <sub>x</sub>+ <sub>y</sub>)/2
C.	( <sub>x</sub>+ <sub>y</sub>)/3
D.	0
Answer» C. ( <sub>x</sub>+ <sub>y</sub>)/3