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ENGR-45_Lec24A_MTE2_Exam-Review.ppt 1 Bruce Mayer, PE Engineering-45: Materials of Engineering Bruce Mayer, PE Registered Electrical.

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Presentation on theme: "ENGR-45_Lec24A_MTE2_Exam-Review.ppt 1 Bruce Mayer, PE Engineering-45: Materials of Engineering Bruce Mayer, PE Registered Electrical."— Presentation transcript:

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

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

3 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 minutes

4 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 ENGR-45_Lec24A_MTE2_Exam-Review.ppt 5 Bruce Mayer, PE Engineering-45: Materials of Engineering

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

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

8 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 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 ENGR-45_Lec24A_MTE2_Exam-Review.ppt 10 Bruce Mayer, PE Engineering-45: Materials of Engineering

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

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

14 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)  Given Xform Data  Then find the time Required for 95% Transformation

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

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

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

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

19 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 = >> Y2 = log(log(1/0.4)) Y2 = >> X1 = log(280) X1 = >> X2 = log(425) X2 = >> P = [X1, 1; X2, 1] >> Q =[Y1; Y2] Q = >> z = P\Q z = >> n =z(1) n = >> k = exp(z(2)) k = e-009 >> t = ((log(1/.05))/k)^(1/n) t =

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


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