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Question: the maximum shear stress in a solid round bar of...

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The maximum shear stress in a solid round bar of diameter. d, due to an applied torque, T, is given by Tmaz ( nd) A round.cold-drawn 1018 steel rod is subjected to a mean torsional load of T - 1.3 kN.m with a standard deviation of 160 Nm The rod material has a mean shear yield strength of S ,-312 MPa with a standard deviation is 30 MPa Assuming the strength and load have normal distributions, what value of the design factor nd corresponds to a reliability of 0.99 against yielding? Determine the corresponding diameter of the rod The design factor is The diameter of the rod is mm.
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