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. | S, Sy Answers: o, = MPa MPa Try = MPа Op2 =

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Solid Mechanics

Engineering mechanics is a branch of science that deals with forces causing bulk motion in bodies and the effect that these forces cause on the bodies. Engineering mechanics does not deal with the internal changes that occur on account of these external forces. The internal effects in a body or a material under the action of external forces are studied in a new branch of science called solid mechanics, the strength of materials, or the mechanical behavior of engineering materials.