The state of plane stress at a point is shown on the element in Fig. 9-20a. Represent this state of stress on an element oriented 30° counterclockwise from the position shown. SOLUTION Construction of the Circle. From the problem data, 12 ksi 6 ksi 8 ksi EXAMPLE 9.8 90 МР 60 MPa 20 MPa The state of plane stress at a point is shown on the element in Fig. 9-19. Determine the maximum in-plane shear stress at this point. SOLUTION Construction of the Circle. From the problem data, 0,--20 MPa 0,- 90 MPa Tay-60 MPa