EML6324 HW 1 - l f The true strain ε f at fracture is...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Fall 2011 EML6324 Fundamentals of Production Engineering HW 1 (Due on Sept. 9, 2011) 1 Q1. What is the difference between engineering stress and true stress in a tensile test? Q2. Which of the two tests, tension or compression, requires a higher capacity testing machine than the other? Explain. Q3. In addition to Brinell and Rockwell hardness testing methods, the following are hardness test methods in practical use: (a) Vickers hardness test, (b) Knoop hardness test, (c) Shore hardness test, and (d) Mohs hardness test. Explain the hardness testing methods (a-d) listed above. Q4. Describe ductility and toughness . Q5. The Hall-Petch relationship states that the tensile yield stress is related to grain size. Write the Hall-Petch equation and explain the mechanism behind the equation. Q6. A rod with initial length l 0 is plastically elongated to a length l 1 = 1.4 l 0 . Calculate the true strain ε for this plastic deformation. Q7. A rod with initial length l 0 is plastically elongated until it fractures at length
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: l f . The true strain ε f at fracture is 0.912. If the initial diameter d is 12.7 mm, calculate the diameter at fracture d f . Q8. A test specimen with a gage length of 50 mm and an area of 200 mm 2 is used in a tensile test. During the test, the specimen yields under a load of 98,000 N. The corresponding gage length is 50.23 mm. This is the 0.2 percent yield point. The maximum load of 168,000 N is reached at a gage length of 64.2 mm. Determine the (1) yield strength, (2) modulus of elasticity, and (3) tensile strength. Q9. In Question 8, fracture occurs at a gage length of 67.3 mm. (1) Determine the percent elongation. (2) Determine the percent reduction in area if the specimen necked to an area of 92 mm 2 . Q10. The figure below illustrates the phase diagram of two components with no solid solubility. (1) What is the name of the composition at point C? (2) Describe its characteristics....
View Full Document

This note was uploaded on 09/27/2011 for the course MAE 6324 taught by Professor Greenslet during the Fall '11 term at University of Florida.

Ask a homework question - tutors are online