MATLS 1M03 - WebCT - Assignment 5 - Try 5

MATLS 1M03 - WebCT - Assignment 5 - Try 5 - Learning System...

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View Results Name: SIAMAK KIANI Attempt: 2 / 3 Out of: 15 Started: March 25, 2009 2:38am Finished: March 25, 2009 2:56am Time spent: 18 min. 15 sec. Question 1 (1 point) True or False? The degree of brittleness of a material is not a function of temperature. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: False . Most materials become more ductile as the temperature increases. For more information, see the section on Fundamentals of Fracture in the text. Score: 1 / 1 Question 2 (1 point) What is the magnitude of the maximum stress (in MPa) that exists at the tip of an internal crack having a radius of curvature of 1.75 x 10 -4 mm and a crack length of 0.393 mm when a tensile stress of 153 MPa is applied? Use scientific notation, significant figures in answer: 3 Student response: Not answered Correct answer: 1.03E4 (1.03 * 10 4 ) MPa General feedback: See equation 8.1 in the text. Remember that a = half the internal crack length. Score: 0 / 1 ( Question not answered. ) Question 3 (1 point) For a metal that has a yield strength of 181 MPa and a plane strain fracture toughness KIc of 48.8 MPa*m 1/2 , compute the minimum component thickness (in mm) for which the condition of plane strain is valid. The thickness B for which the condition of plane strain is valid may be computed using the following equation: Use decimal notation, digits after decimal: 0 Student response: Not answered Correct answer: 182 mm General feedback: Use the equation given to solve for B . Score: 0 / 1 ( Question not answered. ) Question 4 (1 point) A fatigue test was conducted in which the mean stress was 49 MPa and the stress amplitude was 191 MPa. Calculate the minimum stress level (in MPa). Use decimal notation, digits after decimal: 0
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This note was uploaded on 02/08/2010 for the course MATLS 1M03 taught by Professor Okon during the Winter '09 term at McMaster University.

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MATLS 1M03 - WebCT - Assignment 5 - Try 5 - Learning System...

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