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Aductile 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: (a) σx = 100 mpa, σy = 50 mpa (b) σx = 100 mpa, τxy = –75 mpa (c) σx = –50 mpa, σy = –75 mpa, τxy = –50 mpa (d) σx = 100 mpa, σy = 20 mpa, τxy = –20 mpa
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