ss_7 - [—_—— I 25 Consider a rolling operation as...

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Unformatted text preview: [—'_____——__ I 25. Consider a rolling operation as described schematically below with a metallic alloy having a pre-deformation microstructure given on side I and a post-deformation microstructure given by side II. a) If you were to make hardness measurements from material sampled from side I and from side II, which would be higher? Briefly why? b) Draw a schematic stress-strain diagram for tensile bars cut from side I and from side II. c) Suppose samples from side I and side 11 are heated to 0.8Tm. Briefly describe how the microstructure of each sample would change under annealing. d) Suppose the rolling process were done not on a metallic alloy but instead on a ceramic material like silicon nitride (Si3N4). Briefly sketch the microstructures you might expect for side I and side 11. e) Suppose the rolling process were done not on a metallic alloy but instead on a thermoplastic polymer like poly(ethylene). Briefly sketch the microstructures you might expect for side I and side II. "DVBQL-E mun as; mesa. we “w W C2903 WWL 09- We emermnw stead/e533, Swamp mum”! WWW’ t ‘\ W's sum when“; :95 “Wm M" B ' “S View mm > “- mvtk wwwmkfix @1me Uth Ml» new?» U: B WWNEW who , “05MB \SC Kiowa: Ut {It “Wes. 9"" ‘I 6:) M. esteem 69' W wk mist: Safe/t: we m- 903:» memma 6 "“J M at N New Mass WEN Woom WT Wk 5%” W ' DEW: all P0 Wit? W kax more. Mesqle zen—Ht: was We.) WW Emil emcee, w heretth l——_———_——____l 27. Suppose you make tensile bar from a piece of window glass. When it is loaded in tension you find that it breaks at a stress substantially lower than that listed in ASTM databases. How do you explain your experimental finding? We WT” YQE. Odie; eat. hearse ‘b‘ifi’fiZ/CS $006 we, 3% Wad; 0‘2“- NW Woes NM“ vexce—Es Wt all/(filed Ya, no Caxfi QUE/fl W game $51k CTLM \g mew q. 2am, M— k Em33 New” No m.x.lhw wee-3x33 LE. [——————-———____ 28. The yield strengths and fracture toughness values characteristic of several engineering alloys are given in the table below. Consider a structural application where a material must support a tensile stress of 730 MPa. If nondestructive testing equipment is available which can detect internal cracks and surface defects larger than 2 mm, which of the three materials would you recommend for the application? Justify your answer. Alloy KIC (MPa-m'm) 0y (MPa) 7178-T651 A1 23.1 570 Ti—6Al-4V 55 1035 4340 steel 60.4 1515 W :er‘ifi M M07 cm at; V'LLxMHk-Wr}: \MMemmew‘ Realise or tapas; we owe k e; Lissa}. Vacuum We anem- m Nfi‘mdmm Tweak was as: 112,0 ma)... To moose ‘3‘:wa We 0W3} om hos-r (3951592 MW. WSQ>W To 13:95.1“; RmRE {WY Lu: (7"! SET” 3‘) CWT : W Q V ‘2, we: U W Te 1 egg was: 1. 1AM; wow/16c: w: 0&0 Na». tr *— m’ ... ~73 - KW kéonl \ 36m) w WW. : “" "' W 6M "1"“: 1mm Wm C(QM’ (3°50) TV - WA;er ammo; k3ka = 0.0071 b 1 21”“ 1\ mm. is; "gem... musk ' $uwk k clump mods» Vest" swam Va‘r We we . tum; \VHW. tema- We W3‘W ail-"W1 SWAT PM”? W U‘M’U‘ mamas re Mama? \5 m‘r a warez, W H3110 mu Plioxlxbfi, us. who: lamp at 3%. [——_____———— I 29. A steel cylinder containing C02 gas at a pressure of 1500 psi is being transported along a major US. highway. A rock thrown up by a passing vehicle strikes the tank and creates a 1 cm diameter hole. a) Describe the conditions which would cause the cylinder to explode in response to the bullet hole sending steel fragments in all directions at high velocity; b) Similarly, explain the circumstances under which the gas would simply vent from the cylinder harmlessly. M my two TU WWW we» WT W CV LW\HIL VOWK EML kw EVA‘WLBL th \C— \TS Maven ‘WUM \8 Low Epsom NT Pr \ch ms sous. guests 5* $5?— Ps Mme ec— \sbvpsx \L-ge as“ R *— bsmpsxgwgux -. $0on -—- ' \OlS-S Vs:— m? WUWWL WOWSEE WMWQ o:- TY?\M\ ?U\u¢* 059%» gm NEE ~ k«VD-5713‘ ¥J>'~ QT.) 5» we”: sew Fr, $1: ESQ/mac mum WM 3 no"? OCCUR, m \X‘Dbfiz, 03?. RLW- P: CRNLL\ wagon “vii 'TU EEC Mm»; mt,qu TD CNUS‘L CNY'QSWDQ‘MC “Mum. emu»st M 0% hawk SiMU-y Lest. OJ . $30le NM“ \T— M mums: \s WV” hid» WW3 W1. WAY. Cm NOT“ Mk F“ W EPOW Nb swexmfi N NML. \ © W8 \9 No EKWMR afi— ancmi Whaua. m Hmsmfi- my “.3 Ha: Fuxsmauw 530% N 33392., \T Mxl‘ oqogmpmm \usz M; 6:25 \T, W xxx; @Lhaxmkuy EWEB \T M EACH TME W HAT \T WEN—o mud: scam 01w: 69 Wmflr HC‘L Mk WN\ N E953- mm WEBB SUEVrTLV H33 EEW“: QW$SWWOUI WSW ms WW Harm: wachww gamma mamas Lufik‘g FazMEis Q’s? b\S\OC/\P~;T\CN kang‘ RN‘A (sods TRWEm W: Fpr\ V;me FEACTUBEU r—_____—-‘——I 32. Differentiate between creep and fatigue. Cite at least one example where each type of failure may occur. 546:, km WWWWXWM R $\5~J\HCNI WDWP 65 Wm ‘50 bxFFUSmx-b 0%“ OCCUR. Chm FMUJUL us thhcuwaW Ext, 095% Fara 709-bth Ram w W FRT\0\JQ\J 0:: k W \HL\S\00$b/\ EJme C577 mam \WEDUWCTS w {it awm‘. \JOWCH- W8 M Comb mm “W w \s WNEL Mfume) mm W Wu CH cue-Amy Efikm‘: mx (ENDS , ...
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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_7 - [—_—— I 25 Consider a rolling operation as...

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