ss_6 - fift—i— — _ — _ _ l 1. A tensile test is to...

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Unformatted text preview: fift—i— — _ — _ _ l 1. A tensile test is to be performed on a piece of plain—carbon steel plate. Suppose its yield stress is 50 ksi and its ultimate tensile stress is 65 ksi. The plate is 16 gauge (i.e. thickness = 005082”). For a flat tensile specimen cut from this plate with a gauge width of 0.75 in, does the tensile test instrument have sufiicient capacity to break tensile bars of this steel if the maximum load it can apply is 10,000 lbs? Quantitativer justify your answer. mg” so : (gaggle-050%? “5 \ \ .A n 'L I: __ 0.050%? -:. 0.0233“, "5 ‘ VM : \qoovvos =5 q”: -‘——-————--* 2 M __..- ’ ' “mew-Z» DEA“: '2’ 0T3" (D H mws‘kfi |___m__—___——_l 3. Steel pipe employed for oil drilling operations is made up of many segments joined sequentially and suspended in an oil well. Suppose the pipe used in one such application has an outer diameter of 7.50111 and an inner diameter of 5cm, 3 density of 7.90Mg/m3, and a yield strength of 900MPa. If the pipe is designed with a safety factor of two [i.e. the maximum stress in the field must be less than half the rated yield stress], what is the maximum depth that can be safely reachedior drilling. Where does the maximum elastic strain occur in the pipe? .9 S. An 18—8 stainless steel is characterized by the following mechanical properties: 0,, = 120 ksi; 0T = 180 ksi; elongation to failure = 12%; E = 12,000 ksi Using these four properties as guides, sketch 3. wellmlabeled stress-strain diagram for this material. 7. For the 7075-T6 aluminum alloy described in the adjacent diagram, determine: a. the yield stress; b. the tensile stress; c. the elongation to failure; and d. the modulus. 100 03 0 Suppose a tensile bar of this alloy is deformed in tension to an engineering strain of 0.02, the load is released to F=0, then the same bar is used in a second identical tensile test. Sketch the stress-strain curve for the second test. Identify (i.e. give specific values) the elastic modulus, the yield stress, the ultimate tensile 0 stress, and the percent elongation to 0-05 0-10 0-15 0-20 faflura E gineering strain, mm/mm (in./in.) Ir? ' 400 2024-T351 O) 0 Engineering stress, MPa Engineering stress, ksi ® 6",: M¥fl rvo'\6 650 © Vssowxv a \Mxobtfl‘D/s (9 E; 52mm" -= mnéfi. o. oxe— 0.001 3:” $mc3¢ NV it gems sS~ 0.07. Sow: T’kaVC 0% W ~- (zmi‘nows one: Datum We 6:, KERR? 3 VB? E Zw‘mg mm ¥aic enemy VHW mm $UMY \oLuEzR. We no Wt \sTTw' €51i” Mk) ETC, bxnxx RWY—\w—b Wt _________l 9. The curves below describe experimental data characterizing changes in mechanical properties in Cu as a function of its Ni content. For pure Cu; Cu—20 wt% Ni; and (Eu-40 wt% Ni, draw on a single well-labeled diagram stress-strain curves for these three materials. Please carefully address the Young’s modulus. 130 25 60 400 160 a ,_. - E g g 140 20 .E .C u E 50 g E 120 3 a a g 300 g 3 15 w _ E 40 E 100 80 r 10 zoo 3° '60 0 10 20 30 4D 50 O 10 20 30 40 50 Nickel contenl (M96) Nickel content (was) (a) (b) 60 "r 50 .5 N .5 § 5 40 E. E 200 2 0 10 o 30 4 50 l , , _ , _ v lucunli 7.14 Vanatton With nlckel content of (a) tensile N'CKE' “mam M9") strength, (b) yield strength, and (c) ductility (%EL) for (c) copper—nickel alloys, showing strengthening. 9. The curves below describe experimental data characterizing changes in mechanical properties in Cu as a function of its Ni content. For pure Cu; Ctr-20 wt% Ni; and Cu-40 wt% Ni, draw on a single well-labeled diagram stress-strain curves for these three materials. Please carefiJlly address the Young’s modulus. 53 can 3; 3:" Era 50' E; w e r? e g 30:) g '3, an IE:- 2nn 3'3 n in 20 30 an 50 Nickel content [M331 (a) 50 E Eat] a E as ‘; 4n 2 s = 2 m an 20 CI 10 20 30 an en Yield strength [MPa} 180 25 1 ED 140 20 124:: 1cc 15 cc V 1 c 50 c m 20 an an sc Nickel ccntent {wtfié} (b) Fltjl'ltli 114 1|ir’ariatinn with nickel content of (a) tensile Nickel content {nutter} strength, (in) yield strength, and (c) ductility (%EL) for (c) copper—nickel alloys, shflwing strengthening. TN; \Wem'ux W TD Quarrmfi v: N“? “WW m1: w‘TN Ni Whmu‘! \meéS 01'! N456; «$5Ws m b\oom\ DD , Q £45 M97 "— ’ “ - k . C‘Jflwvflgvp y» 62' w “7%. L: ‘ Zap I 1 Cu II . \00 | I E 0A 0-1 053 OH 05' e 0.6 ’ Em" \Vx' 6% EV- '- 70) 5‘01 _ e; om 6;. Mus m. mm "Cu ‘4 Z'x'b’ 6'6 \Pr Cw 19L): ‘01 33° L“ (53" C»- km-r‘ \SB RGO '82. \S’ 3 |___—'__—_————_l 12. The modulus, yield strength, tensile strength, and percent elongation to failure of a type 6063 T6 aluminum alloy are: 69 GPa; 215 MPa; 240 MPa; and 12 %, respectively. Those of high-density poly(ethylene) at room temperature are: 1.08 GPa; 30 MPa; 31 MPa; and 200%, respectively. On the same stress-strain diagram, sketch the stress-strain curves for these two materials. For each material estimate the energy required to break tensile specimens of each of these two materials. Wage pm; W. WWW m was; gob aka" Vflt wfifi @W MA?) m» W: N RWY. HA5,“ WIT? §E 0H ‘ o'g ' \«Zr {Ni LES 6: ENG"? km}; W“; To :mwm : Muck W1 cams-be? ERQA‘H r&\ngz' ‘ KAJ ‘35:» W?“ S3“ '2. \DE )3: S}, M1 . r“ m \loumwt m Y My Faw- 9A 1 Ev; 3W“ 0 Wk“); 1‘5:- o.03\1 ~ \06 A} 1 7:3 6%;- -.=‘> fit; u {090.- 0.OB\1\L2LL0«‘L\S\~ éiLops‘fiCAgB = S’s} MT “ ‘ 1.9. A13 1’0 : O. 030 Fog. pelt 6‘1: n :5 p N mam» macaw "- 6v: “‘43 -‘g‘ '3 "2m. WW hw- gpmww kaa‘muwx W, W2»; w; 09°" “WM? W Mum m, fih—fifi —- .— _ _ __ 15. On a single diagram, sketch stress-strain curves for a typical ceramic, metal, and thermoplastic polymer. Briefly explain why these curves are so different from each other. Pr TWqu amt: M k mm Vobow': K» w B) \p m wsexam @5— SWJLSS Capt-W a. 7 \5 exam, k McNk M80 opts k Wm B \‘Y’ wow. W adfisWV trkky $01 5— > 5-? Nb W8 r» yaw/D e,wa “VD Hmfifz. ‘\\ WVLM “Wmmc bacon/ML “M: k Nut \pwcat e, Lemme» ma ‘2:ka W Vere/\ww/ Seems} Mb mm 5- ?:OV ix 0%»: \M'CN“: Howrah To __._________fi 21. Would you expect the indentation due to a 10 mm diameter ball under a 3000 g load to be larger for SAE 1340 steel or for 18-8 stainless steel? Briefly justify your answer. No calculations are needed. gamma}; \lxk éDDZVS; ow “ mayo; 5W \‘svxo sweat.” who?) Wm) emanates \% <2, a;th xi‘fs‘a @‘cm' 5x\k% -. \ELLD I _ 5mg) 2:: : SSCl \‘SRD EDN‘S") é: \wc 5:, ‘> at! We 3; \WWT w W "$3M "bV‘Mm/Fasx ":WEK Loxu KER. W. 22. Briefly explain how you could make a hardness measurement of an elastic band by indentation. YOU COO (ANA-r, WEN):sz MWK Wamfic ‘Fwavc Bailomm. gray/Magi 0(- \TK_. Low ELHSWC muwg Mk “edgy Wm EWSQC EEWW’NSWW‘A M cwm' fififiT/hwgw mksmwc-x [WW—T m Bkng FEMS” ...
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This note was uploaded on 10/03/2009 for the course E E344 taught by Professor Libera during the Spring '09 term at Stevens.

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ss_6 - fift—i— — _ — _ _ l 1. A tensile test is to...

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