At a point in a stressed material, the major principal stress is 66 kPa compression and the minor principal stress is 34 kPa tension. (a) Use the Mohr’s circle to determine the shear and normal stress on a plane 45° ccw from the major principal plane. (b) Determine the stress combination acting on the plane 75° ccw from the major principal plane.

At a point on the free surface of a stressed body, a normal stress magnitude of S, = 51 MPa (C) and an unknown positive shear stress exist on a horizontal plane. One principal stress at the point is 11 MPa (C). The absolute maximum shear stress at the point has a magnitude of 64 MPa. Determine the unknown stresses on the horizontal and vertical planes and the unknown principal stress at the point. Sgy S Answers: O, = i MPa i MPa Txy = MPa Op2 =

Strength For the state of plane stress shown, determine the largest value of o, for which the maximum in plane shear stress is equal to or less than 75 MPa. After you determine the value, draw Mohr circle for the case

Consider the state of plane stress shown. (Hint: Consider both in-plane and out-of-plane shearing stresses.) 7 ksi Determine the maximum shearing stress when ox- 18 ksi and ay = 8 ksl. The maximum shearing stress is ksi.