1. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 1 Bruce Mayer, PE Engineering-45: Materials of Engineering Bruce Mayer, PE Registered Electrical & Mechanical Engineer BMayer@ChabotCollege.edu Engineering 45 MT2 Exam Review

2. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 2 Bruce Mayer, PE Engineering-45: Materials of Engineering Paper Creep

3. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 3 Bruce Mayer, PE Engineering-45: Materials of Engineering Paper Creep A. Dwan, “Paper Complexity And The Interpretation Of Conservation Research ”, Journal of the American Institute of Conservation, Vol. 26, No. 1, pp. 1-17), 1987 Find a LINEAR equation, ε(t), that approximates the creep of paper over 1-100 minutes

4. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 4 Bruce Mayer, PE Engineering-45: Materials of Engineering Draw “Good” Line, Find 2-pts  2.47%  2.16%

5. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 5 Bruce Mayer, PE Engineering-45: Materials of Engineering

6. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 6 Bruce Mayer, PE Engineering-45: Materials of Engineering

7. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 7 Bruce Mayer, PE Engineering-45: Materials of Engineering

8. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 8 Bruce Mayer, PE Engineering-45: Materials of Engineering Lever-Law vs. T Problem  Pb-Mg Alloy → 45 wt% Pb  Quenched from Hi-Temp at Which The Alloy is a solid with Phase Fractions: W α = 65% andW Mg2Pb = 35%  Find the Approximate Temperature from Which the Alloy was Quenched

9. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 9 Bruce Mayer, PE Engineering-45: Materials of Engineering Freeze-In Problem 45  For T room Equil  “Freeze In

10. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 10 Bruce Mayer, PE Engineering-45: Materials of Engineering

11. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 11 Bruce Mayer, PE Engineering-45: Materials of Engineering

12. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 12 Bruce Mayer, PE Engineering-45: Materials of Engineering T for Pure α = 26.5%Pb 25.6  “Freeze in from 360C 360

13. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 13 Bruce Mayer, PE Engineering-45: Materials of Engineering Lever-Law vs. T Problem Ans

14. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 14 Bruce Mayer, PE Engineering-45: Materials of Engineering Prob 10.9 → Avrami Eqn  Given that A→P Transformation obeys the Avrami Eqn: % Xformed, yTime, t (S) 20420 60425  Given Xform Data  Then find the time Required for 95% Transformation

15. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 15 Bruce Mayer, PE Engineering-45: Materials of Engineering

16. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 16 Bruce Mayer, PE Engineering-45: Materials of Engineering

17. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 17 Bruce Mayer, PE Engineering-45: Materials of Engineering

18. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 18 Bruce Mayer, PE Engineering-45: Materials of Engineering

19. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 19 Bruce Mayer, PE Engineering-45: Materials of Engineering P10.9 MATLAB Solution >> Y1 = log(log(1/0.8)) Y1 = -1.4999 >> Y2 = log(log(1/0.4)) Y2 = -0.0874 >> X1 = log(280) X1 = 5.6348 >> X2 = log(425) X2 = 6.0521 >> P = [X1, 1; X2, 1] 5.6348 1.0000 6.0521 1.0000 >> Q =[Y1; Y2] Q = -1.4999 -0.0874 >> z = P\Q z = 3.3849 -20.5732 >> n =z(1) n = 3.3849 >> k = exp(z(2)) k = 1.1620e-009 >> t = ((log(1/.05))/k)^(1/n) t = 603.0849

20. BMayer@ChabotCollege.edu ENGR-45_Lec24A_MTE2_Exam-Review.ppt 20 Bruce Mayer, PE Engineering-45: Materials of Engineering Pb-Sn Solders