{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

quiz 1 answer sheet - r1 BMED 2100 Biomateriais Science&...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: r1 :- BMED 2100 Biomateriais Science & Eng Name ”q M 7 WLy; Spring 2009 QUIZ #1 — 2.5 points per question Open book, open notes, 40 minutes 1. Based on our case study of the fractured hip stem, list 3 problems that can arise due to issues involved with manufacturing hip stems by casting ASIM F 75 alloy Q MVIW-‘M 4W3 Ade/h m Cffla‘xmea Mafia/“I NeJ-l'rf’bien'g -*' irr*.¢»'1’.ie-a.¢ jg fflaagfima i ,) 45331-133. #13145?! swam gear-311.3) flagella! in All!“ 413,153, ffi’iflwfiuéuetbm a} jflé’fli} MM )2??? ”,3 3,3153! M Unfit/As) jg??? 61w! mflii meg-om dram .447. (A) Aft-.4911!“ 5‘11. ’4‘le Fg'r/fi‘fl ((1%... Alma {Maw (”Lug-*9 jg“, IK/Qtw) V/ {5?} flex-flax -‘r ""L’3-r3 ) 2. In Case B, below, the hip stem is loaded by a 475 lb downward load. Assume the annular area under the collar of'the stern = 0.25 i112, and that the stem extends into medullary canal. Assume that the Young’s modulus of bone is 17.4 GPa, and that there is no “bonding” between stem and bone in the medullary canal Assume also that the stem is a perfect rigid body (no deformation). Compute how far the stem’ 5 tip slides down relative to the bone. Alternative problem statement: what rs the change 1n height of a 10- inch tube of bone of cross- -sectional area 0 25 in2 when axially loaded with 475 lb. (1 lb3 4 448 N, l inch= 25.4 mm, 1 GPa— — 109 N/rn2 ) Fag. S A. Prosthetic replacement by external plates and compressive screws. .l’rosthetic replacement by ”inter- fer'enec fit‘ of intramedullarv stem combined with collar abutting on cut end of bone. .. I’1osthetic replacement using cement to transfer load to rough endosteal surface ot bone. Note aha-nee of collar on prosthesis since cut end of shaft of bone not used in this method of load transference. From Charnley, .I (1972) Aer ,1;er Cement In Or thopaedfc Surge; ,1» Churchill Livingstone. ‘1 . . - \._.—_W1~WA-4»---WA .. 7'! . 45-75-14!“ (4,1330 . r“ ,. [DJMC‘J'I‘ 5km? f i U E2; .. ( M4411 7.1:»: “t4 P“ a. m. ,1, L J Lg Mm; we!" 2%. i' : I / _ A“ L011 ‘ 0. 007g; Word/i.» 1 W fl ‘3 For the hip stem being loaded as shown, suppose a strain gage at the surface point A measures a longitudinal strain (ie., approximately along the axis of the stem) of'3000 microstrain (3000 pg) The Young’s elastic moduius of'the stem metal is 200 GPa Compute the longitudinal stress at point A ('3 E52» . a, G ‘ “w 31"” E” “I I L c237. me: Q Ji 5' ' ) Scam 0am I, a g _, firs {his ) at er: ( .~ i. ‘— C-ai’i} 3%: («M5 '33 lift §( ,4 {A UV“ f‘ in! y), 4M Lg Kim? MEL» W 4. Two samples of metal, A and B, are identical except in terms of grain size What’s the difference between the yield strengths of metal A and metal B if'metal A has a grain size of 1000 microns whereas metal B has a grain size of 10 microns? Assume the constant kin the Hall-Fetch relationshlp IS equal to the value 1864 MPa (microns)05 '7 v ,7 i: J. ' i. if t} i M -- ins-M E A. {th E :_ git; + am .4" E2. 7 *4 M ti“ 54%” ' W“ A: *3 ‘ E 1.1" ' ‘ ' i . r Ii ”i ””4 J"; —., M 3 {wt HM ‘ i P’ title ’ i ,‘ A 1 gr} a v? f E ... ’ 4. \ g " '4 F :1 Ebflm’o m _ 3 j .1 57'? 24:5 .2 , igazf-mik macaw (at *«54 ) i a; 4 J 4 7.. a .05" —/ A j: M ii 13¢ M W“ ] , m4 Mam [/ 20W) 2 _ Kimmy ] . \ r "t. \A . (r) a. Am a awwm. 5 20 2 Pa: ,1; 1i: L-r'i’”? ‘ M V . ' ' 7! g», k C \ lift {5:} (if) N 55%; wt; met-«5:113 Vii" €1§’£.FL€+'-CF m f i344 (5 "Wf‘i' 37?,” fl 5;}? a 37 Z, 01 1"“ ".4 i as , - Jr , F57 w- l + m LL a a“ i r C a m WWW WU isms. a 2 w an i 44 WU {a c 01.4 1 if! “Ci/i - I f~ I h k r .35 [0% V 0L j . 32,}, , /i A A...» LAW-j WW? ‘9 r “as“ n Wm M 2 g 1)? A3»... {5" 3 Q4343 WNW/7.9 JUQ {HA-fl ’4— fl 1 w a 5; pix/lye» 5 . m...) i ...
View Full Document

{[ snackBarMessage ]}