Exam+II+Key - EML 3301C Exam IE Spring 2011 Name é Pledge...

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Unformatted text preview: EML 3301C Exam IE Spring 2011 Name é Pledge I Idid not cheat C 2: i 1) FrOm the stress-strain diagram for a metal, determine . _ 3 _ v (5 a) Modulus of elasticity 6/5 = @- 5; 63.002 “\M” VH— b) Yield stress 6Q r c) 0.2% offset yield stress '{Z3l d) Ultimate strength ‘hfilr \ {13“ 6) Breaking strength ' l. g) Over what strain range-does strain hardeni. g occur 0 , 00 11) Over what strain range does necking occur @ '0 [,0 2 "" O a 01% é i) Percent elongation 22 —— 080102 . 100 O ".li:.w._l x y r x I i . . _ : x . I 0' 0.002 0.002 0.004 0.006 ’ 0.008 0.010 0.012 0.014 Strain (in/in) C l O 2) When determining the stress—strain behavior, why is it not appropriate to use the cross-head displacement from the testing machine rather than a: strain gage or extensometer attached to the samp ? _ ' / I [(36:sz 06” " gécaOS—e oi COMP/10:07.08 642% CFVOSSf-[rbéa 9VIP5. became. one 9w? Slldopafifi. 3) How many independent material properties (elastic constants) are required to describe the stress-strain behavior in the linear range for a unidirectional fiber reinforced composite? One of them is E. Name the others. ' igvko 5 ‘ 7: , .242 2/13 4) What is the maximum possible fiber volume fraction for a unidirectional fiber reinforced composite? Derivethe equation. I r I 7f: q“ Lia #1}!er . ‘ 8 ‘ (/VLH' p.‘ a; 1e‘r'rreflér :Teiz 13V =3f§32 zv’é 5) . 5) A ductile material has a yield strength of 30 ksi. If the stress state is shown below, determine if you would 5 expect failure to occur using a) Tresca failure criterion b) von Mises failure criterion . “ CV5 £33m ' m0 «Collar/e " [43957 5 «Z fluwvfi acoov M9 ‘l-O 77CSCCZ . (? 612—6! 62 “$622 :25?2 (Wm—(31') 05) +65% 7/60) 2 ...
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This note was uploaded on 09/06/2011 for the course EML 3301C taught by Professor Chesney during the Spring '08 term at University of Florida.

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Exam+II+Key - EML 3301C Exam IE Spring 2011 Name é Pledge...

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