Materials Assignement 5 Attempt 3

Materials Assignement 5 Attempt 3 - WebCT Quiz Homepage

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_06_newRestore/s. .. 1 of 4 25/03/2006 4:16 AM View Results Name: BRYCE JONES Attempt: 3 / 3 Out of: 9 Started: March 24, 2006 1:05pm Finished: March 24, 2006 1:33pm Time spent: 28 min. 51 sec. Question 1 (1 point) Which kind of fracture is associated with the intergranular crack propagation mechanism? Student response: Correct Response Student Response Answer Choices a. Ductile b. Brittle c. Either ductile or brittle General feedback: Intergranular fractures are brittle in nature, and crack propagation is along grain boundaries . For more information, see the section on Brittle Fracture in the text. Score: 1 / 1 Question 2 (1 point) A structural component in the shape of a flat plate 25.7 mm thick is to be fabricated from a metal alloy for which the yield strength and plane strain fracture toughness values are 507 MPa and 38.0 MPa-m 1/2 , respectively. For this particular geometry, the value of Y is 1.76. Assuming a design stress of 0.384 times the yield strength, calculate the critical length of a surface flaw (in mm). The critical length of a surface flaw is given by Here σd is the design stress. Use decimal notation, digits after decimal: 2 Student response: 3.91 mm Correct answer: 3.91 mm General feedback: Use the equation given to solve for ac . Remember that σd = 0.384 * σy. Score: 1 / 1 Question 3 (1 point) A large plate is fabricated from an alloy that has a plane strain fracture toughness of 57.9 MPa-m 1/2 . While it is in service the plate is exposed to a tensile stress of 216 MPa. The value of Y for the plate is 1.3. Determine the
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Materials Assignement 5 Attempt 3 - WebCT Quiz Homepage

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