Exam3 Fall2010

# Exam3 Fall2010 - BE 1300 Exam 3 Exam 3 BE 1300 Materials...

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BE 1300 Exam 3, November 23, 2010 1 Exam 3 BE 1300 Materials Science for Engineering 11:45AM to 1:05PM NAME ____________________ ID# _______________ Quiz Section (Time, Day, and TA's name): ______________________________________________ CLOSED BOOK/CLOSED NOTES: Nothing except this exam, your calculator (devoid of programmed equations) and a pen may be on your desk or in your line-of-sight at any time. Do not use pencils. Scratch work may be done on the reverse sides of this exam or on the two blank sheets. However, credit for any problem at those locations that you want graded will not be given unless you tell us, at the original problem, where it is. College policy states that anyone giving or receiving information during an exam will be given an immediate failing grade for the course. I understand and agree to abide by the above rules. SIGNATURE: ___________________________________ NO EXAM WILL BE GRADED WITHOUT A SIGNATURE . Scores Problem One _______ Problem Two _______ Problem Three _______ Problem Four _______ Problem Five _______ TOTAL _______

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BE 1300 Exam 3, November 23, 2010 2 You may need the some of following information and formulas: Boltzmann’s constant k = 8.62 10 -5 eV/(atom K). Gas constant R = 8.314 J/mol-K. Avogadro’s number N A = 6.023 10 23 atoms/mol. Stress: σ = F/A Relaxation Modulus: E r (t) = σ (t)/ ε 0 Strain: ε = ( L - L 0 ) / L 0 Hall-Petch equation: σ y = σ 0 + k y /d ½ Hooke’s Law: σ = E ε Poisson’s ratio: ν = - ε x / ε z = - ε y / ε z Flexural strength for rod geometry: σ fs = F f L/ ( π R 3 ) Do all of the Problems: Each one is worth 20 points. Problem One -- Circle the correct answer to each question. There is only one correct answer to each question! This problem is graded on answer only. 1. Strain hardening or cold work a) Increases the yield strength and ductility of alloys. b) Increases the yield strength and decreases the ductility of alloys. c) Decreases the yield strength and increases the ductility of alloys. d) Decreases the tensile strength and increases the ductility of alloys.