The compound shaft consists of solid steel and bronze shafts and hollow aluminum shaft (D= 2.25" and d=0.90''). It is subjected to two torques as shown in the figure. The moduli of rigidity for steel, aluminum, and bronze are 12x106 psi, 4x106 psi, and 6x106 psi, respectively. Determine the shearing stress developed in each material. Also, calculate the angle of twist incurred by the aluminum shaft.

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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.