MATLS 1M03 - WebCT - Assignment 4 - Try 2

# MATLS 1M03 - WebCT - Assignment 4 - Try 2 - Learning System...

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View Results Assignment 4 (Ch 6 & 7) Name: BRIAN NIXON Attempt: 1 / 3 Out of: 19 Started: March 8, 2009 12:18am Finished: March 9, 2009 5:57am Time spent: 28 hr, 39 min., 24 sec. Question 1 (1 point) A stress-strain graph for a plain carbon steel is shown below. A cylindrical specimen of this alloy 565 mm long is pulled in tension. What is the radius of the specimen if an elongation of 1.13 mm occurs when a load of 28.2 kN is applied? Student response: Percent Value Correct Response Student Response Answer Choices 0.0% a. 3.08 mm 100.0% b. 4.74 mm 0.0% c. 3.55 mm 0.0% d. 5.18 mm General feedback: Find the strain using the equation in 6.2 Concepts of Stress and Strain , then use the graph to find the stress that produces that strain. Rearranging the equation for stress in section 6.2 to solve for cross-sectional area will allow you to find the radius. Score: 1 / 1 Question 2 (2 points) A 10 mm-diameter Brinell hardness indenter produced an indentation 1.4 mm in diameter in a steel alloy when a load of 474 kg was used. Calculate the HB (in HB) of this material. Use decimal notation, digits after decimal: 0 Student response: 3 HB Correct answer: 306 HB General feedback: The Brinell hardness may be calculated using the following equation: Page 1 of 5 Learning System Quiz Homepage 3/9/2009 http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_09/scripts/student/serve_quiz_marke...

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See the Hardness-Testing Techniques Table in the text for more information. Score: 0.2 / 2 Question 3 (2 points) A cylindrical metal specimen is pulled in tension until fracture occurs. The specimen has an original diameter of 8.0 mm and gauge length of 103 mm. At the point of fracture the diameter is 1.7 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: 95 % Correct answer: 95 % 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: 2 / 2 Question 4 (1 point) An alloy to be used for a spring application must have a modulus resilience of at least 8.25 x 10 5 J/m 3 (8.25 x 10 5 Pa).
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