Question: At a certain critical point in a steel beam, on a vertical plane the compressive stress is 115 MPa and the shearing stress is 31.5

At a certain critical point in a steel beam, on a vertical plane the compressive stress is 115 MPa and the shearing stress is 31.5 MPa. There is no normal stress on the longitudinal (horizontal) plane. Find the stresses acting on the principal planes and the orientation of principal planes with the horizontal. (After Taylor, 1948.)?

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