Mid-term exam 02 - NAME MATERIALS SELECTION 530.352 FALL...

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NAME: ________________________________ MATERIALS SELECTION FALL SEMESTER 530.352 PROF. K.J. HEMKER MID-TERM EXAMINATION (Closed book - closed notes - open mind) October 28 th , 2002 1. We have covered a number of different topics in class. Briefly answer 5 out of the 6 questions listed here. Be sure to cross out the one that you do not want me to grade. (5 points each; 25 points total) i) Describe the atomic structure of polymers like polystyrine; what is the basic structure and how big is it? Explain the difference between thermoset and thermoplastic, between branched and cross-linked, and between T glass and T melting ii) Draw and label the (121) plane. Is there a <110>-type direction [uvw] on this plane? If so, what is it? What is the <111>-type direction on this plane? x y z 530.352 Materials Selection Mid-term Exam 2002 Page 1 of 9
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1. cont. (answer 5 out of 6) iii) You work for Ferrari and your boss would like you to design a new piston rod such that it is both light-weight and does not buckle when loaded in compression. You may assume that piston rod is cylindrical with a diameter of 6 mm and a length of 25 cm and that the following relations hold: m = π r 2 l ρ P buckling = 2 EI l 2 = 3 Er 4 4 l 2 Derive the [F][G][M] equation and give the materials index (M 1 ) to minimize the weight of the sticks. iv) One way to slow down dislocations and make a metal stronger is to add a second element and make a solid solution alloy. About how much solute is there in a solid solution alloy? Give the empirical relation for the solid solution
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This note was uploaded on 04/08/2008 for the course MECHENG 352 taught by Professor Hemker during the Spring '08 term at Johns Hopkins.

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Mid-term exam 02 - NAME MATERIALS SELECTION 530.352 FALL...

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