Hw1Solution

# Hw1Solution - LOUISIANA STATE UNIVERSITY Mechanical...

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LOUISIANA STATE UNIVERSITY Mechanical Engineering Department Professor Meletis ME 2733 Fall 2004 Materials of Engineering Homework Assignment #1 Solution 1. The potential energy (V) between two adjacent ions is: (a) 0 2 / 1 0 5 3 4 2 2 0 4 2 a a A B a a B a A da dV a B a A V = = = = + = The value of a o is substituted in V to obtain V o () ( ) 2 2 0 4 2 A B B A B A V + = B A V o 4 2 = 2. Zn 10 2 6 2 6 2 2 3 , 4 , 3 , 3 , 2 , 2 , 1 d s p s p s s Co 2 7 6 2 6 2 2 4 , 3 , 3 , 3 , 2 , 2 , 1 s d p s p s s K 1 6 2 6 2 2 4 , 3 , 3 , 2 , 2 , 1 s p s p s s N 3 2 2 2 , 2 , 1 p s s Ge 2 2 10 6 2 6 2 2 4 , 4 , 3 , 3 , 3 , 2 , 2 , 1 p s d p s p s s 3. The geometry of the H 2 O molecules, which are hydrogen bonded to one another, is more restricted in the solid phase than for the liquid. This results in a more open molecular structure in the solid, and a less dense solid phase. 4. (a) (b) 0 10 20 30 40 50 60 0 2 04 06 08 0 1 0 0 Elastic Modulus (1000 Ksi) Thermal expansion Coefficient o C -1 x10 6 10 3 ksi

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High E (W, Mo, Cr) – Potential well has high curvature; as T is raised mean atom separation increases only slightly due to relatively high symmetry of well. This means low
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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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Hw1Solution - LOUISIANA STATE UNIVERSITY Mechanical...

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