Quiz 3 - 2006 - MAT33 Engineering Materials and Processes...

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MAT33 Engineering Materials and Processes Fall 2006 Third Exam - Monday 18 th December 2006 NAME ……………………………………………………. . Section Professor Pearson Th 12.10pm .……. Q1………. . Professor Marder Th 1.10pm ……. . Q2………. . Professor Soukhojak Fr 8.10am ..…… Q3………. . Professor Soukhojak Fr 9.10am ……. . Q4………. . Professor Rickman Fr 10.10am ……. . Q5………. . Total………. ..% Closed book exam. Please write your final answers in the blanks provided, where appropriate. Partial credit for questions will only be considered if your workings are shown. Calculator policy: I have cleared my calculator’s memory prior to taking this exam. Signature ________________ Useful Equations σ c = 2 E γ s π a 1/2 K = Y σπ a + = 1 2 0 max t a ρ - = RT Q K c n s exp ε 2 2 5 . 1 bd FL fs = 3 R FL fs = Useful constants Avagadro’s number, N A 6.023 x 10 23 atoms/mol Boltzmann’s constant, k 8.62 x 10 -5 eV/atom-K = 1.38 x 10 -23 J/atom-K Gas constant, R 8.31J/mol-K 1
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1.) Failure of Materials (29 points) a.) A structural steel with a fracture toughness of 60MPa.m 1/2 has no surface crack greater than 3mm in length. By how much (in %) would this largest surface crack have to grow before the system would experience fast fracture under an applied stress of 500MPa? [Assume the geometrical factor Y=1] Crack growth (in %)………………………………………………… b.) The series of curves shown below describe the time dependant plastic deformation of a material under constant stress at different temperatures. i.)
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This note was uploaded on 02/09/2008 for the course MAT 33 taught by Professor Keith during the Fall '07 term at Lehigh University .

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Quiz 3 - 2006 - MAT33 Engineering Materials and Processes...

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