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1M03 2009 ASSIGNMENT 5-1 &Acirc;&iquest;&Acirc;&macr;

# 1M03 2009 ASSIGNMENT 5-1...

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Name: SOO NAM Attempt: 1 / 3 Out of: 15 Started: March 23, 2009 10:31pm Finished: March 24, 2009 1:54pm Time spent: 15 hr, 23 min., 1 sec. Question 1 (1 point) True or False? A brittle material typically exhibits substantial plastic deformation with high energy absorption before fracture. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: False . A brittle material exhibits little or no plastic deformation with low energy absorption before fracture. For more information, see the section on Fundamentals of Fracture in the text. Score: 1 / 1 Question 2 (1 point) For a metal that has a yield strength of 139 MPa and a plane strain fracture toughness K Ic of 31.6 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: 129 mm Correct answer: 129 mm General feedback: Use the equation given to solve for B . Score: 1 / 1 Question 3 (1 point) Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane-strain fracture toughness of 26 MPa-m 1/2 . It has been determined that the wing component will fracture when a stress of 112 MPa is applied and the maximum (or critical) internal crack length is 8.6 mm. Will the wing component fracture when 125 MPa is applied to it and the critical internal crack length is 6.0 mm? Student response: Correct Response Student Response Answer Choices a. Yes, the wing component will fracture under those conditions. b. No, the wing component will not fracture under those conditions. General feedback:

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1M03 2009 ASSIGNMENT 5-1...

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