A plate in equilibrium is subjected to uniform stresses along its edges with magnitude σxx = 30 MPa and σyy = 50 MPa as shown in the figure.The Young’s modulus of the material is 2 × 1011 N/m2 and the Poisson’s ratio is 0.3. If σzz is negligibly small and assumed to be zero, then the strain εzz is

A plate in equilibrium is subjected to uniform stresses along its edge

1.	A plate in equilibrium is subjected to uniform stresses along its edges with magnitude σxx = 30 MPa and σyy = 50 MPa as shown in the figure.The Young’s modulus of the material is 2 × 1011 N/m2 and the Poisson’s ratio is 0.3. If σzz is negligibly small and assumed to be zero, then the strain εzz is
A.	-120 × 10-6
B.	– 60 × 10-6
C.	0.0
D.	120 × 10-6
Answer» B. – 60 × 10-6