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# 1M03 2009 ASSIGNMENT 4-3 Â¿Â¯ - View

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View Results Name: SOO NAM Attempt: 3 / 3 Out of: 19 Started: March 9, 2009 11:28pm Finished: March 9, 2009 11:30pm Time spent: 1 min. 44 sec. Question 1 (1 point) Consider a brass alloy the stress-strain behavior of which is shown below. A cylindrical specimen of this alloy 20 mm in diameter and 188 mm long is to be pulled in tension. What is the stress (in MPa) necessary to cause a 0.0105 mm reduction in diameter? Assume a value of 0.34 for Poisson's ratio. Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. 120 MPa 100.0% b. 135 MPa 0.0% c. 155 MPa 0.0% d. 160 MPa General feedback: The transverse strain (x or y) for a cylinder of diameter d o is: You can calculate the longitudinal strain by using Poisson's ratio: which is the negative ratio of transverse (x and y) and longitudinal (z) strains. Intercepting the longitudinal strain with the stress-strain curve can show the amount of stress needed to cause the specified reduction in diameter. For more information, see the section on Elastic Properties of Materials in the text. Score: 1 / 1 Question 2 (2 points)

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A cylindrical metal specimen is pulled in tension until fracture occurs. The specimen has an original diameter of 7.4 mm and gauge length of 104 mm. At the point of fracture the diameter is 1.4 mm, and the gauge length is 111 mm. Calculate the ductility in terms of percent reduction in area (in % ). Use decimal notation, digits after decimal: 0 Student response: Not answered Correct answer: 96 % General feedback: Percent reduction in area is defined by the equation For more information, see the section on Tensile Properties: Ductility in the text. Score: 0 / 2 ( Question not answered. ) Question 3 (2 points) A 10 mm-diameter Brinell hardness indenter produced an indentation 1.6 mm in diameter in a steel alloy when a load of 407 kg was used. Calculate the HB (in HB) of this material. Use decimal notation, digits after decimal: 0 Student response: Not answered Correct answer: 201 HB General feedback: The Brinell hardness may be calculated using the following equation: See the Hardness-Testing Techniques Table in the text for more information. Score:
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## This note was uploaded on 04/04/2011 for the course MATLS 1M03 taught by Professor Okon during the Spring '09 term at McMaster University.

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1M03 2009 ASSIGNMENT 4-3 Â¿Â¯ - View

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