Manufacturing Engineering & Technology
Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 6, Problem 21QLP

If aircraft, such as a Boeing 757, are made of 79% aluminum, why are automobiles made predominantly of steel?

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Modern commercial airliners are largely made of aluminum, a light and strong metal. But the fact that aluminum is cheap enough that airplanes can be made out of it is a bit of historical luck. Before the discovery of the Hall-Hèroult process in 1886, aluminum was as rare and expensive as gold. What would happen if airplanes had to be made of steel? The fuselage of the Boeing 777, which can carry 305 passengers, is approximately a hollow aluminum cylinder without ends, 64.0 m long, 6.2 m wide, and 2.5 mm thick (see sketch at right). The fuselage of an airplane Suppose this fuselage was made of steel (density 7.87 g/cm') Instead of aluminum (density 2.70 g/cm ), and let's say the average passenger has a mass of 80 kg. We'll also assume the engines can't lift any greater mass than they already do. Calculate the number of passengers that the Boeing 777 could 'carry if its fuselage was made of steel.
Calculate the impacts on size (diameter) and mass/unit length of replacing a natural bone in the leg with one made of steel, aluminum, or titanium. Use compressive strengths and densities provided in class for bone, steel, and aluminum. Use r=0.00443 kg/cm3, and s=848 MPa for titanium. Assume the bone is hollow with outside diameter 2.5 cm and inside diameter 3 cm. Maintain the same inside diameter. HINT: first calculate the load on the bone..

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