Chap8_2pgs - $train and l|nrdening flnltedling E-5 A...

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$train l|nrdening and flnltedling E-5 A 0.505-in.-diameter metal bar with a 2-in. gage length lo is subjected to a tensile test. The following measurements are made in the prastii region: Change in Fo*" (lb) Gug" l"ng , ( ( Xt Diameter (in.) -Fsoo o.zroffi 27,000 0.4428 0.4566 25,7W 0.6997 0.4343 Determine the strain-hardening exponent for the metal. Is the metal most likely to be FCC, BCC, or HCp? Explain. Solution: Gage Tlue True Force length Diameter shess srain (lb) (in.) (r!.) (psi) (in./in.) 27,500 2.2103 0.4gm 151 ,970 0.100 27,W0 2.4429 0.4566 164,g93 0.200 25,7W 2.6997 0.4343 173,496 0.300 cr= K"rn or ln or = In K * nln e ln(I51,970)=ln K+n ln(O.1) ll.g3 14=ln K -nQ.3o26) ln(I73,486) =ln K+n ln(0.3) 12.0639= ln K-n (1.2040) -O.1325 - -1.0986 n n = 0.r2 which is in the range of Bcc metals
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8-18 A 0.25-in.-thick copper prate is to be cord worked 63vo.Findthe finar thickness. Sofution: (See Figure 8_7.) Ag =YS - t- d xtffi% or l=O.@2sin. 76
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This note was uploaded on 02/01/2012 for the course MSEG 302 taught by Professor Snively during the Spring '08 term at University of Delaware.

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Chap8_2pgs - $train and l|nrdening flnltedling E-5 A...

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