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11hw2-21jan - Rockwell C from R C =20 to R C =50(You may...

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EML 4321 --- HW #2 --- Due 21 January 2011 1. Explain in a few sentences in your own words what the difference is between MRP and MRPII. (Just listing what “M”, “R”, and “P” represent is not sufficient.) 2. Textbook question Q1.1. 3. A cylindrical steel specimen for a tensile test has an initial gage length of 1” and a diameter of 0.25”. Under a load of 2500 lbs, the gage length is increased to 1.1”. (Assuming no necking at that point.) a. What is the engineering stress? b. What is the engineering strain? c. What is the new diameter? d. What is the true stress? e. What is the true strain? f. Assuming the current engineering stress equals the yield stress (no strain hardening), what was the gage length when plastic strain (yielding) started? Hint: assume g. If the load is removed, what will be the gage length? 4. Using Table 2.1, plot the ultimate tensile strength of steel (MPa) as a function of
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Unformatted text preview: Rockwell C from R C =20 to R C =50. (You may plot by spreadsheet, MATLAB, any plotting routine, or by hand.) 5. A steel specimen has a BHN of 200. a. What is the UTS in psi according to Table 2.1? b. What is the UTS in psi according to Equation 2.11? 6. A Charpy impact test is conducted according to Figure 2.5. Assume that the radius of the arm is 750 mm and the hammer has a mass of 2 kg. If the hammer is initially held horizontal before dropping, plot the energy (J) absorbed by the specimen as a function of the maximum angle of the hammer from the specimen after impact. Hint: want this plot Note: A copy of Figure 2.13 is on the reverse for your convenience. You may want to have this with you for the lectures on steel on other iron alloys....
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