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Question: problem 100 marks a ductile hotrolled steel bar has...

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Problem # 1:00 Marks) A ductile hot-rolled steel bar has a minimum yield strength in tension and compression of 350 MPa. Using the distortion-energy and maximum-shear-stress theories determine the factors of safety for the following plane stress states (α) σ.-100 MPa, σ.-50 MPa (b) σ.-100 MPa, tx,--75 MPa (c) σ.--50 MPa, σ.--75 MPa, tr,--50 MPa Problem#2:00 Marks) A brittle material has the properties Sut-210 MPa and S 630 MPa. Using the brittle Coulomb- Mohr and modified-Mohr theories, determine the factor of safety for the following states of plane stress (a) σ.-175 MPa, Oy = 105 MPa (b) σ = 140 MPa, tx,--70 MPa (c) σ.--105 MPa, σ.--70 MPa, try =-105 MPa
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