11hw3-28jan - of yield strength for the aluminum alloys in...

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EML 4321 HW #3 --- Due 28 Jan 2011 1. Let’s say that we have some grade 30 US Steel 1008 cold rolled structural sheet. (see http://www.ussteel.com/corp/sheet/cr/cold-rolled-sheet.asp ) The sheet is four feet wide and we want to reduce the thickness from 16 gage to 18 gage in one pass between six inch diameter rolls turning at 2000 rpm. (see http://www.engineersedge.com/gauge.htm ) a. What is the peripheral velocity of the rolls in SFM? b. What is the separating force on the rolls in tons? c. What is the torque required to turn a single roll in pounds-feet? d. What is the total power required to drive both rolls in horsepower? e. What is the minimum coefficient of friction required to insure that end of the sheet is pulled into the rolls? 2. Using different symbols for casting and wrought alloys, plot elongation as a function
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Unformatted text preview: of yield strength for the aluminum alloys in Tables 2.7 and 2.8. 3. Using different symbols for casting and wrought alloys, plot ultimate tensile stress as a function of yield strength for the aluminum alloys in Tables 2.7 and 2.8. 4. You have one ton of Fe 2 O 3 iron ore which you will reduce to pure iron. a. How many pounds of C are needed assuming you are 100% efficient at producing CO 2 ? b. How many pounds of iron will you get? 5. You have a cube of liquid that takes five minutes to solidify. a. If each side of the cube is increased 50% in length, how long will it take the cube to solidify? Use equation 3.13. b. If instead , only one dimension of the cube is increased by 50%, how long will it take for the new item to solidify? (all sides are still rectangular or square)...
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