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PAGE #7

# PAGE #7 - 7(a The plot of impact energy versus temperature...

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0"2 U --:1- r -2E which, using data computed in the problem, yields a value of ~ 50 x 106 Nlm2 "f Ur = ~~v ~ IV I~/III ) -5 3 {;; (2)@0 x 109 Nlm2) -2.25 x 10 Jim ~2.6 in. -lbflin.3~ (f) The ductility, in percent elongation, is just the plastic strain at fracture, multiplied by one-hundred. The total fracture strain at fracture is 0.110; subtracting out the elastic strain (which is about 0.003) leaves a plastic strain of 0.107. Thus, the ductility is about 10. 7%EL. Hexagonal close packed metals are typically more brittle than FCC and BCC metals because there
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Unformatted text preview: * 7. (a) The plot of impact energy versus temperature is shown below. * 8. =i'->-es II c: ~-U ! E (b) The average of the maximum and minimum impact energies from the data is 76 J + 2 J 2 = 39 J Average = n"-As indicated on the plot by the one set of dashed lines, the ductile-to-brittle transition temperature according to this criterion is about 10°C. (c) Also, as noted on the plot by the other set of dashed lines, the ductile-to-brittle transition temperature for an impact energy of 20 J is about -2°C....
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