Fall2011-ME382-MidtermI-Solutions

# Fall2011-ME382-MidtermI-Solutions - ME 382 Fall 2011...

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1/12 ME 382 Fall 2011 Mid term 1 Monday, October 10 th , 2011 This is a closed book exam; students are allowed an unmarked copy of the ME382 data book. Show all calculations for full credit. If you need more paper, staple it to the back of this exam. There are a total of 12 pages to this exam. Use a ruler / straight edge to read from any graphs. Name: Honor Pledge: Question 1: 25 points Question 2: 20 points Question 3: 15 points Question 4: 15 points Question 5: 25 points Total: 100 points

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Que (1a) For a Ans: Total Total (1b) FCC (1c) mate FCC. packe unde tough (1d) heigh stion 1 (25 (4 points) a BCC lattice l number of l number of (1 point) W (5 points) erial? Why? There are m ed planes c er the stress hness. (15 points ht 0.5 m, an The first the force figure be The atom It is one o 5 points tot What is th e? f atoms per u f atoms per u Which is the ) Which do ? more close p can slide ov strain curv total) You d told to fig thing you d that the cy low; ignore ic mass of y of the follow tal) he total num unit cell, FCC unit cell, BCC e more dens o you expe packed plane ver each oth ve the hig u are given a gure out wha do is hang t linder impa the mass o your elemen wing elemen mber of atom C = face + co C = center + sely packed ct to be a es in FCC str her easie gher ductili a cylinder of at it is. Here the cylinder arts on the l f the load ce nt is 80 g/ m nts: ms per unit orners = (6/2 corners = (1 structure – tougher st ructures, en er to yield) ity of FCC st f element “X e is what yo r from a loa load cell as ell compone mol. t cell for an /2) + (8/8) = (1) + (8/8) = – FCC or BCC tructure, a nhancing du . Toughness tructures en X” with radi ou know: ad cell, whi 0.69 N (as s ents and wi 2/1 n FCC lattice = 4 = 2 C? FCC or BC ctility (close s is the are nhances the ius 5mm an ch measure shown in th re). 12 e? CC e ea ir nd es he
3/12 o Materialius (BCC, atomic radius 0.23 nm) o Wolverinium (FCC, atomic radius 0.48 nm) (1d 1) (5 points) What is the density of the material? mass ( kg ) volume ( m 3 ) 0.69 N 9.81 m s 2 (0.005 2 m 2 )(0.5 m ) 1800 kg m 3 (1d 2) (10 points) What is the element?

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## This note was uploaded on 11/22/2011 for the course ME ME382 taught by Professor Dowling during the Fall '11 term at University of Michigan.

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Fall2011-ME382-MidtermI-Solutions - ME 382 Fall 2011...

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