HW5solution

HW5solution - is fixed, there is no degree of freedom).

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Louisiana State University Mechanical Engineering Department Professor Meletis ME 2733 Fall 2004 Materials of Engineering Homework Assignment #5 Solution 1 . The worse case scenario is that the entire length of the defect acts as a stress concentrator, thus, a = 0.04 cm, K IC = 105 ksi in , Y=1.1 a Y K IC π σ = , a Y K IC = ksi 429 54 . 2 04 . 0 1 . 1 105 = × × = _______________________________ 2 . Phase rule: F = C – P + 2 For C=3; P=5; F=0 So, observation possible but only at a specific T. P and composition of all 5 phases (everything
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Unformatted text preview: is fixed, there is no degree of freedom). _______________________________ 3 . (a) Solubility of Pb in Mg: ~41 wt% Pb at ~ 460 o C. (b) Phases present: pure Mg and Mg 2 Pb Composition: 0% Pb, and ~81% Pb Weight fractions: % 32 81 55 81 = − − = Mg f % 68 2 = Pb Mg f _________________________________ Primary α (Mg); f Mg = 48% Eutectic (Mg) Eutectic Mg 2 Pb 4. 5. 6....
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This note was uploaded on 01/22/2012 for the course ME 2733 taught by Professor Meng during the Fall '10 term at LSU.

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HW5solution - is fixed, there is no degree of freedom).

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