3.4-9 Four gears are attached to a circular shaft and transmit the torques shown in the figure. The allowable shear stress in the shaft is 70 MPa. (a) What is the required diameter d of the shaft if it has a solid cross section? (b) What is the required outside diameter d if the shaft is hollow with an inside diameter of 40 mm? 900 N-m emaldon avitsne d novi 2100 N-m D.m 450 N-m Amm 002 br 750 N-m В (b) 191 boriupet n oalAIM 0A = T22012 lle O a bas & 218o9 a99wiod saiwilo olgms s, 18 Coldewo PROBLEM 3.4-9

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Types and properties of steel

Steel is an alloy of iron. It is formed by heating iron and combining carbon (0.1-1.7%) with it and minor amounts of other elements such sulfur,  chromium, manganese, nickel, etc. Thousands of steel grades have been published, registered, or regulated around the world, each with its chemical composition, and special numbering systems have been devised in various countries to classify the vast number of alloys.