MATLS 1M03 - WebCT - Assignment 5 - Try 6

MATLS 1M03 - WebCT - Assignment 5 - Try 6 - Learning System...

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View Results Name: SIAMAK KIANI Attempt: 3 / 3 Out of: 15 Started: March 25, 2009 3:05am Finished: March 25, 2009 3:05am Time spent: 0 min. 11 sec. Question 1 (1 point) Which kind of fracture is associated with the transgranular crack propagation mechanism? Student response: Correct Response Student Response Answer Choices a. Ductile b. Brittle c. Either ductile or brittle General feedback: Transgranular fractures are brittle in nature, and crack propagation is through the grains. For more information, see the section on Brittle Fracture in the text. Score: 0 / 1 Question 2 (1 point) A large plate is fabricated from an alloy that has a plane strain fracture toughness of 50.7 MPa-m 1/2 . While it is in service the plate is exposed to a tensile stress of 229 MPa. The value of Y for the plate is 1.2. Determine the minimum length of a surface crack (in mm) that will cause the plate to fracture. Use decimal notation, digits after decimal: 1 Student response: Not answered Correct answer: 10.8 mm General feedback: The minimum surface crack length that will cause the plate to fail is given by: For more information, see the section on Fracture Toughness
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MATLS 1M03 - WebCT - Assignment 5 - Try 6 - Learning System...

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