MSE200_S08_practice_exam2_solution

MSE200_S08_practice_exam2_solution - Sample Test Materials...

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Unformatted text preview: Sample Test Materials Science and Engineering Department MSE 200 Exam #2 Spring 2008 ID number First letter afyaar last name: No notes, books, or information stored in calculator memories may be used. Cheating will be punished severely. All of your work must be written on these pages and turned in. To receive fill! or partial credit on numerical problems, you must Show your calculations in step-by—Step fashion. Units must be shown when applicable and all plots must have labeled axes. Be sure that you read and answer all parts ofeaclr question. Constants, equations, and other data are given on the last page of the exam. I. Multiple choice (3 points each): ,1) l, lithe grain size is reduced at. the yield strength will be increased M Jul-EL G b, the hardness will be increased 3 ' c. the ductility will be decreased (1. all of the above The ductility of Cu{FCC] is greater than Zn{HCP) beeausa ‘Fcc : a, FL“; 3 '3 dent. on; . Cu melts at a higher temperature . FCC metals have a greater number of active slip systems, “‘5 l7— 1' S The bonding of Cu is metallic. : Noncol‘theabove HG? Z 1rfl4hl X K&Wcl:mu$ The resolved shear stress in a slip system depends on: 5‘) 3 “IQP $3ng a. the orientation of the slip plane b. the orientation of the slip direction ECQ‘MQOU S W e, the magnitude of the applied stress (1. all of the above Which is an impact test ? a. Rockwell b. Vickers Harrell-M55 c. Brinell d. Charpy The number of cycles a test specimen will survive at a given stress amplitude is called the a. endurance limit (-2an the.“ = :Fataw. b. Fatigue strength as: as.“ at x a if an; ! E 6. Brittle fracture is characterized by a. large permanent deformation prior to failure h. abrupt (catastrophic) failure with little or no wanting. c. blunting ol'erack tips d. All of the above _ C _7. Recovery and recrystallization processes 2:. occur after grain growth is completed b. cause increased dislocation density (J. cause tensile strength to decrease (1. none of the above _ 3 8. The addition of Ni solute to Cu 3. eliminates grain boundaries b. increases tensile strength c. increases the ductility d. none of the above _ 9. One of the primary functions of a Charpy impact test is to determine a. K.c values b. ductile—to—brittlc transition temperatures c. the fatigue limit d. b. and c. j) 10. Failure by creep occurs a. for BCC metals at cryogenic temperatures where dislocation slip is difficult b. for FCC metals at tcmperatures above half of their melting point in degrees Kelvin Q wotanJ-k . for all metals subjected to variah loads that cause veryr high strain rates _ all of the above 1 1. (I0 points) Sketch the miemstrueturc ofthc fracture surface for a fatigue fracture and identify the regions. ‘ _. M W £94 ‘ #LW‘h' d—Q /Abi~efiutJax Z —' alleviate Mada/t 3 ‘ Mfixlflh 12. (10 points) Sketch a Charpy impact toughness versus temperature diagram for an ECG and FCCmeial. IndieatetheDBTT : F -. : -- -.=-. :a - --.- -_-.- -: -- Weave—metals. M4 gal-"3% (Lose film-5:15 1”me 'DIRECTM )KTT: Emilee-m J, J mien-thratu W: (emu am) m was ,- 00¢» cachet 'KCL why-5 : £15; IHPQEmNOE 9F C7153! I3. (10 points) Sketch the ("madman diagram for a Steel whose ultimate tensile slrenglh is 60,000 psi and its endurance limil is 30,000 psi. What alternating stress amplitude can this steel withstand indefiniter in wnjunction with a static tensile stress of 20,000 psi? + Std»; ‘[ /? EMWQ LCM-J“: admin-b, hm!va ska-3‘0 20 $900 G: O 000 14. (m paints) Why is the slope for stage II crccE less than that for stage I creep?. Qwfiawm this (luna‘fiwimd MAJ MM W15. 15. {1'0 points) 011 the axes below, sketch a graph of stress amplitude vs. Log [number of cycles 10 failure) (S—N) curvc for a material having a fatigue (endurance) limit. {\ éuaLU-hamu (Fa-Lth Stress amplitude Lug (cycles) 16. (5 points} A plate is C.W. by passing it between rollers. It has an initial thickness of 0.5 cm and a width of 4 cm. If we wish to EiWa tflis mfg-36 what should baits thw‘ess after rolling? «4 d! n l'. ' - " «9mm 9: (£24 urns; = L__L_J._._‘l__r“_‘l.‘_m.___i_ ,‘ loo lam-.2 now: That...“ fl (0 '5' -- x) cw. 'FOK'THIS ‘ = ‘ X = ‘ CHE gb 0 a? OS cu. :D ...
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MSE200_S08_practice_exam2_solution - Sample Test Materials...

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