AE 753 Fall 2012 Quiz1.pdf - iif/Ligfr 155_ofCompos:tes QUIZ No.1 Fall 2012"if I Answer the foilowing(5 points each 56/6 1 BLEK describe the thee major

AE 753 Fall 2012 Quiz1.pdf - iif/Ligfr 155_ofCompos:tes...

This preview shows page 1 - 15 out of 15 pages.

Image of page 1

Subscribe to view the full document.

Image of page 2
Image of page 3

Subscribe to view the full document.

Image of page 4
Image of page 5

Subscribe to view the full document.

Image of page 6
Image of page 7

Subscribe to view the full document.

Image of page 8
Image of page 9

Subscribe to view the full document.

Image of page 10
Image of page 11

Subscribe to view the full document.

Image of page 12
Image of page 13

Subscribe to view the full document.

Image of page 14
Image of page 15

Unformatted text preview: éiiéfiffi/Ligfifr 155;_ofCompos:tes QUIZ No.1 Fall 2012 "if? I. Answer the foilowing (5 points each) 56/6? 1' BLEflK describe the thee major PIOCCSSES for. filament extrusion « I I; .- III . P .. III, I Mag-PI Sgig’fififlfll .I. WII-Pm‘; Iii-P2. PIPI n22: “£5"? PIP-“PP II P 52¢. IIIIIIIPIIII . {PIPES 51 fi-Pngwmi ”its: $93!!”sz it ”If, 17 I fl“: ‘3??? "6M% PPPWQPT‘E fl "-P\Pf2P“P 9‘- ”if Pig‘afP-‘IIII. I III III PI P" :‘PP’ ffififi'fiPI‘PIM-E - :1 Vb? I??? ?§‘ij III: erP PM If a . -. _ R W In “Iii? {Lgflgwc “W; Imgiffigj . III II M . :«fl'fif’r 2. List five differences between thermostats and thennoplastics? gifgffiflfii?'g E‘WI’L: {$59,111 nmé‘mgfi éfig “g'fififr (In, (VEM‘IW\ 3' {I‘éktffiflffifgéfi EP-E :IE' ("Z-LL?“ F Vfl‘gg “18;: 3.: I’Vfir Jr- ‘P ESP”? PPPP P IiIPPP-PPI .- III-P HEP; ; [112:2 APP-5P Irma 4m; '- !’ I I iI-P‘P I IMQEEZ'IE 3. What is the approximate range of diameters of a sinwgment in advanced fiber—polymer composites? , 0 - 05’! j; E? @08- i‘mieesg [1— 20 Mm) 4. Why are carbon fibers the most mmon fibers used in fiberipolymer composites for highitech applications? gmamSc lisj lave; Wale? Efficma SiW-v‘hf”: lm‘filfi SFmX-Qe MPJWfbfi. So lifrej awe- Stifmtfii Mal 391g, gWL lama/He werblfii’ fmwhfig. / 5. Carbon fibers have superior fatigue strength Qi TRUE FALSE / 6. What unique characteristics differentiate polymeric solids from metals under ordinary circumstances? I VEMPEWPEME Wm‘ifiym ‘6. W" 7'13ng Witt film” @5in 735awa¥€m Erémffifmfiwe "fie Pygmy-Fe $053233 “ism {Mia a mat; foliage anaiesimi- .. ‘ 3 Level fickle @Efiewwm, w. WWW lanai wait: is ifihwfi figment. $0M; JWQ ifiha$4§fifi Emilie, Etna—EMA), If m!" “‘ PM sigma aria s WW 5‘- {Ween-“t" as} a app/Ike! W a lamfi raisin—m l JL 5M9: Momma) E: ‘9?ng £651” Pom .— Srlygss cleareages: wiren a {DRE-$2914" SPfi'agm ES mfifla‘fiéd; WV a bra Wise! of aim / 7. To account for the Poisson’s effects in the micromechanics models for transverse modulus E2, one has to replace the Young’s modulus of matrix Em by (circle the correct answer) 3.. Em (l—Uf) )K 53.. “ fwfiy Wm Ffig—Eaa‘g ErM-fjgwm’j‘ ”(9:5 Em W b- m ’6 a: an 9 E f 5"? ' '5“ EE‘VW C. %——U:) 7: fifé e. ’" (1+0:] 74 8. Identify the weave styles for the following fabric reinforcements H! I IL :unun—nrr Mlllllflll ! [L is] II’MUUUUI 5: HM $49.1??? Wemva‘ 8 Harm EQA‘HA {Mame / 9 What is the single most important advantage of using any composite matefial? TmiaMéfifffi” %r%€ +0 UVLCJCIQMSJ desijlrxa Miami wflie cififiii‘fiei‘ Material Figs-fig / _ 10. Name the three major constituents of fiber-polymer composites and state the function(s) of each ‘ x , 'r . 3 l fiégga — (we as fie Wigmifi 0.? fie lavage? —- a! fie rise 4' ether 1: Mix vicinite‘i's five 23;: 990W abyessfiéfifl‘ xi Wfifi Erasgm'flfirmgm 753 — Wth‘erei-r lapel besiweem fibers i/ :fl. (maple? 936%. ., figs fielhegiam 0?? 4&8?” meg} mafiX 11. Name and briefly describe the various fiber assemblages lei; (as/rimmoag asiyeis‘iecl immjie 51$ko ism-filmis M Email?” wfl’flmfls [R5 50,0570 wkwwg. w‘ 7 I A; 9w- F M hmgl‘e- cgfiiawvee’ilfi‘ ~ "W (You/h :1... 53‘ (Pav:llec§) can 9" S Melee! gram-S- : Phil YaM“ 9Q» hnméle an? Mafia? {Mi/mi ,7 V// 12. State whether the foflowmg statements are true or false 1. [T] [=T(— 9)] TRUE i __ / 11 [T(—9)] :[T] ./FALSE / k“- 111 1V[SWT=[T]‘1[Su] HT] TRUE FALSE / [T][T] =[I]@ ]./FALSE 1/ V. Vd4.3’t[T ]¢l TRUE 13. The micromechanjcs models for stiffness of composite assume EY'S’EFT' $9ij - between fiber and II. A unidirectional lamina made 0fIM6G/3501—6 is subjected to stresses {6x37} as shown in the figure below. _ Compute the strain {812} in the local co—ordinate system. (15 points) y 5; [fi 0 xpo Fm 750/" { j}: g 50} IOOMPa / T -58 a I .4"; l E3123:- .4: MN: 0 M0 3%, {:5 Q 5%.} / a: “LED / lSOMPa m: cases- 0365‘? m: Sim? =2 ~0~253g was 0.957 —o.5 [T] = 0. 0W :9 933 0 *5 o ‘35 ~o-25 *9 3% / {a} mi 6%.} £512} 7— Eglzj~i57z3 ”“' ESELJLFE—j‘ir “3:; 6‘9} ii if as} >< M W W; 50533 3 III. A unidirectional composite is made up of isotropic fibers with Young’s modulus EE and matrix with Young’s modulus Ern (assume that E is greater than Em). With a fiber volume fraction of 50%, the longitudinal and transverse Young s modulii fof the composite were experimentally measured as E =3OOGP2, and E2 2.20GPa 0. Estimate the fiber and matrix modulii using the rule of mixtures (10 points){ E! ; 300 = E; (019* Em ((05)‘ 11g, fivha’c wquld be the '.15an W5“ wmi' IV. Given the basic lamina properties E1, E2“ 1' V mrfi" “ " 3 limitng value of the shear modulus GB, for the case of a h1g6 stiffness 13151113. orieIiEdr at 9=45° t0 the x- axis [0 (10 points) 1 [E 753 MECHANICS OF COMPOSITES QUIZ N0. 2 l. A balanced 8; symmetric laminate is subjected to bending load Mk [f the twisting curvature of the laminate has to be zero, what additional bending load IVL _ has to be applied to the laminate (4 points) 4". a _. m ’ """ r i M? EM {it} 2. a laminate is fabricated using AS4/3501--6 maiéfigli‘éefifi £"§£5é’1§fi§”§"é&ifiéfiéé b'f""’[d790]1he 131}? thickness is 0.005 inches. Determine the component DSS of the [D] matrix for the laminate ( 6 points) £2 [4 .’ Fall 2012 pn—l 5. A AS4/ 3501-6 lamina shown below (refer to'help sheet for elastic properties) is subjected to global stress Ux=+p. Using the Maximum Strain failure theory, (30 points) a. determine the angle 9 at which the failure mode transitions from a transverse tensile failure to a matrix shear failure. b. What is the value of ‘p’ for this angle at failure? a? F1, = 300.5ksi EC = 250.5ksi 1+; = 10.80ksi F26 = 35.7ksi F5 2 9.86ksi ‘7 W o 59:: £0025 5:— «HLg-afi '- 9 “Rs-rises is, X _ .. D I" n+1: 1/6' - i. 5” ' Fall 2012 ' 4’8 0 2 4. For the laminates listed in the table below, a. check the boxes corresponding to the components of [A] and [D] manices, whose value will be ZERO b. List the total number of plies for each laminate . I 55/,9/w/{9/f9/L9/493 [+/— Fay/#3923928? +6 LAMINATE 7923] /—3(9] Am 537K525 0%ngfiefzs/o ] [o / +25 / 90 / ‘25]; [ [0/+9l—9/1,80] [+QI—QL [0/90L [+45 / —452 /+30]ZS [+(9/(1r 49)]23 _l: 9 é: {fusifiyj/o/fiI—S /+ 93/0) [0 / +45 / —45 1’ 0L X I >< AYS A55 2‘3 (20xpoints) X 7L.» 4%, X x. 9/ I cw -. e,» II a» NOTE: 6 :2 0 or 90 (same applies] tot? thickness CEO/.30 /;a/— 30‘5/423 /$0//30/3aj Fall 2012 1 , (92) ; All Xplies are made of same material and have same ply 5. ANSWER THE FOLLOWING QUESTIONS (8X5 points each) @? a. The in—plane normal strains and in—plane shear strains in a lamina are uncoupled when fig: : flgfi 3' 0 (/L/ b. The bending and twisting deformation in a laminate are uncoupled when “Dr 3 . _ =4 § 5/ c. The in—plane normal strains and iniplane shear strains in a laminate are coupled when fixer A“: 9 f d. The ability to predict failure modes is desirable for conducting Qfogfifisi V3 ’éf/Wfi farm £73k . e. The shear strength Of a lamina is associated with the following loading (circle your choice) f. HashimeRotern criterion is a (circle the correct answer) i. Independent criterion ii Interactive criterion V" iii Both in ependent and interactive iv. None of the above g. List 5 assumptions of the classical laminated plate theory I Sires/9mg 5’6”}?th fit? a mem am,- exymfiec! 9% “b9”? dag—5‘95. (ca Wfihfi . (Comm #1; Jamaal? aw 91.53 3 Small flaw-15f $65355?st 5‘5‘9 flSSWMfigé. / a: slim Assigns 3... its... m aa'?v%»‘céms altars; 3" Flame 911355 W253 f5 0%wa £63; , C74: 1323;», m} neglifiiiéé) 5 @7556 it} £VJ€WWWA§¢W? :12 plying. Sac-£2996 Feflnm‘rj Pi4n6./ h- Give two CXMFPIES of laminates for which the bending & twisting deformation can be decoupled. L +£55z—967 , Sig; =0 ii. loifiggj ism/’5; . 9x gs Fall 2012 4 a J 13.1“} :zczmed to g,» e um w ‘1 4.... flfiw 20 that]: i fl 1' Cflfid IE: : c)? 5;. G‘CCDIS due 5 E g 11 $6 1 elm 1‘ 1 13d (3 {mating} w L Ci"; _ ”2% {9 1-131: (J p {5 ‘ fir pit? ‘pa-x: ...
View Full Document

  • Spring '14
  • SureshR.Keshavanarayana

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Ask Expert Tutors You can ask 0 bonus questions You can ask 0 questions (0 expire soon) You can ask 0 questions (will expire )
Answers in as fast as 15 minutes