For the plane stress situation shown in the figure, the

For the plane stress situation shown in the figure, the maximum shear stress and the plane on which it acts are:

1. – 50 MPa, on a plane 45° clockwise w.r.t. x-axis
2. – 50 MPa, on a plane 45° anti-clockwise w.r.t. x-axis
3. 50 MPa, at all orientations
4. Zero, at all orientations

τ_θ =	σ_x - σ_y	= sin2θ + τ_xycos2θ
	z

τ_xy = 0
σ_x and σ_y are equal.
∴ τ_θ = 0 + 0 = 0 (in all direction orientations)