- For the state of plane stress shown on the element below, draw a Mohr's circle, and a) Determine the principal stresses and show them on an element with the appropriate orientation. b) Determine the maximum shear stress with corresponding normal stress and show them on an element with the appropriate orientation. c) The material has a plane of weakness inclined at an angle $\theta$ to the vertical, as shown. Determine the range of $\theta$ for which the normal stress on the plane of weakness is tensile. [3 Marks]
28 MPa
4 MPa
$\theta$
16 MPa