2.8 The normal stresses at a point in an elastic material are 100 MPa and 60...

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2.8 The normal stresses at a point in an elastic material are 100 MPa and 60 MPa respectively at right angle to each other with a shearing stress of 50 MPa. Determine the principal stresses and the position of principal planes if (i) both normal stresses are tensile, and (ii) 100 MPa stress is tensile, and 60 MPa stress is compressive. Also determine the maximum shear stress and its plane in the two cases. (133.8 MPa tensile, 26.2 MPa tensile, 34.1° and 124.1°, 53.8 MPa, 79.1°; 114.3 MPa tensile , 74.3 MPa comp., 16° and 106°, 94.3 MPa, 61°) 2.8 The normal stresses at a point in an elastic material are 100 MPa and 60 MPa respectively at right angle to each other with a shearing stress of 50 MPa. Determine the principal stresses and the position of principal planes if (i) both normal stresses are tensile, and (ii) 100 MPa stress is tensile, and 60 MPa stress is compressive. Also determine the maximum shear stress and its plane in the two cases. (133.8 MPa tensile, 26.2 MPa tensile, 34.1° and 124.1°, 53.8 MPa, 79.1°; 114.3 MPa tensile , 74.3 MPa comp., 16° and 106°, 94.3 MPa, 61°)