The shaft consisting of steel and aluminum segments carries the torques T and 2T. Find the largest allowable value of T if the working shear stresses are 12500 psi for steel and 7800 psi for aluminum and the angle of rotation at the free end must not exceed 6 degrees. Use G = 12×10^6 psi for steel and G = 4×10^6 psi for aluminum.

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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.