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1 Reove this page when instructed to do so. Work written on this page wi not be arked. UNIVERSITY OF TORONTO FULTY OF PPLIED SIENE ND ENGINEERING Ter Test, February 0, 05 First Year MSE0 INTRODUTION TO MTERILS SIENE Exa Type: Exainers M Hostetter, SD Rasay Perissibe acuators: asio FX-99MS or Sharp EL-50X g 9.8 /s N 6.0 x 0 o e.60 x F R 8.4 J o K k ev ato K J k.8 0 LD # /Length ato K ength of atos on vector LPF PD # /rea ength of vector area of atoson pane PPF area of pane V 4 π r π r bh n V N V ( + ) VS ' n VN PF V c a + b N N Q v N N kt v exp E G( +ν ) F o o τ F 0 γ tanθ i n n( + ) ( ) T o T F + E i τ G γ ν x z y z KI U r 0.5 y f o y f % eongation x Y π a 00 u (u v ) o v (v u ) t ( u+ v) w w i ( h+ k) θ cos uu + vv + ww ( u + v + w )( u + v + w) n w M w M n n n nλ d sin hk θ

2 Reove this page when instructed to do so. Work written on this page wi not be arked. Ec ( t) o w i i ( t) M wm M n ΣxiM i d hk a h + k + τ R app cosφ cosλ y τ RSS ( cosφcos λ) ax n 4 T K T a R a R B : h + k + ust be even F : h, k, a odd or a even a h + k b + ( S a ) ( ) % crystainity 00 S a exp 0 ( np) % W % F f L 0 9 point bend d E E (.9P + 0. P ) bd 0 + k d ½ ' y y 00% 00% + ' + ' n ' 00% ' 00% ' 00% n + n + + ave 00 + ave ' ' + ' ' + 00 ave + + ' ave 00 ' S W L R + S W α R R + S x b ± b 4ac a K t 0 a t

3 Student No First Nae: Last Nae: UNIVERSITY OF TORONTO FULTY OF PPLIED SIENE ND ENGINEERING Ter Test, February 0, 05 First Year MSE0 INTRODUTION TO MTERILS SIENE Marks Part : (/0) Part B:.(/0).(/0).(/0) Exa Type: Exainers M Hostetter, SD Rasay Perissibe acuators: asio FX-99MS or Sharp EL-50X TOTL: (/40) questions are NOT of equa vaue. Marks for each question are given parentheticay. nswer a questions on this exa. Part. Enter the correct answer for the foowing questions in the box to the right of each question. (Each question is worth ark.). Which of the foowing are not a possibe set of quantu nubers for a neutra ato in the ground state? a) n,, 0, s ½ b) n, 0, 0, s ½ c) n,, -, s - ½ d) n,, 0, s - ½. What is the eectron configuration of Fe +? a) s s p 6 s p 6 d 6 4s b) s s p 6 s p 6 d 6 c) s s p 6 s p 6 d 4 4s d) s s p 6 s p 6 d 8 4s Page of 6

4 . Which of the foowing appies to the description of a covaent bond? a) Transfer of an eectron b) Sea of eectrons c) Directiona d) Non-directiona 4. ceraic has a theoretica fexura strength at zero porosity of 70 MPa. If the porosity is 5%, and n., what is the fexura (bending) strength? a) 50. MPa b) 70.0 MPa c) 97.4 MPa d). 0 - MPa 5. The eting teperature of a poyer is near the teperature at the transition between rubbery fow and viscous fow. a) Fase b) True 6. hypothetica ceraic has both higher fracture strength and higher eastic constant (~Young s oduus) than a hypothetica eta. The ceraic ust have a greater toughness than the eta. a) True b) Fase 7. Which of the foowing best describes the onset of pastic deforation in a eta? a) of b), c) and d) are reasonabe descriptions b) When atos in a eta begin to ove to new equiibriu positions c) ose to the proportiona iit d) The sape diensions do not return to their origina diensions upon unoading 8. Which of the foowing represents the typica reative eastic odui (~Young s odui) of the three casses of soids? a) eraics > Metas > Poyers b) Metas > eraics > Poyers c) eraics > Poyers > Metas d) Poyers > Metas > eraics Student No Page of 6

5 9. Which of the foowing best describes why soe poyers are abe to continue supporting oad foowing the onset of necking? a) Poyers do not experience necking b) The cross-sectiona area of the poyer sape does not decrease during necking c) hain orientation increases the strength enough to deay further pastic deforation in the neck d) None of the above 0. heavy desk is paced on a carpeted foor and eft for year. The desk is then reoved and the depth of the indentation under the egs of the desk into the carpet is easured. What condition woud give the argest deforation? a) The roo was aintained at 0 b) The roo was aintained at 0 c) The roo was aintained at 0 d) The roo was aintained at 40 Student No Page of 6

6 Student No Part B.. copper cyinder under tensie stress has an initia ength of 5 and diaeter of 8. opper has a yied strength of 7 MPa and a Young's oduus of 0 GPa. For an appied oad of 800 N, answer the foowing questions. (0) a. What is the eongation, whie the oad is appied? b. If the shear oduus is 44.7 GPa, cacuate the Poisson s ratio and use it to deterine the fina diaeter. Page 4 of 6

7 Student No. uinu has an F structure. Given that the atoic radius of an auinu ato is 0.4 n cacuate the theoretica density of. (0) Page 5 of 6

8 Student No. In the space beow, sketch the generaized stress-strain behaviour for a typica eta, such as anneaed brass. On your sketch, ceary identify each of the foowing. (0) a. 0.% offset yied strength b. Young s oduus c. Proportiona iit d. Utiate tensie strength e. Onset of ocaized pastic deforation f. Region of unifor pastic deforation g. Fracture strength h. Ductiity i. Toughness j. Moduus of resiience Page 6 of 6

MECHANICAL ENGINEERING

MECHANICAL ENGINEERING 1 SSC-JE SFF SELECION COMMISSION MECHNICL ENGINEERING SUDY MERIL Cassroom Posta Correspondence est-series16 Rights Reserved www.sscje.com C O N E N 1. SIMPLE SRESSES ND SRINS 3-3. PRINCIPL SRESS ND SRIN