Unformatted text preview: b.) iii.)
iv.) 4.) The decrease in ductility observed after cold working a metal results primarily
because: (circle one) the dislocation density is increased leading to more dislocation interactions
dislocations become pinned at grain boundaries the dislocation slip planes become rougher the dislocations ﬁnd it difﬁcult to glide past hard precipitates. A copper rod 6.4mm in diameter is drawn through a 5.0mm diameter die in a wire
drawing process. The percent cold work undergone by the metal is: (circle one) ”/oCW : (A0 ‘ A“) as ‘00 A0 —-——-—-———-—‘"-‘ =(“ (osﬁi—‘n’ (0193* 000 ((0-31? (015)1- moo (0'31? = (o-mu — 00675
04on "/ocw = 38““7.
i.) 64% ii.) 44% iii.)39% iv.) 22% Mechanical Properties of Glass Ceramics (24 points) 1r (o-sz)‘ A three point bend test is performed on a glass specimen having a rectangular
cross section with height, d, of 5mm and width, b, of 10mm; the distance
between the support points is 45mm. What is the ﬂexural strength of the glass if
the load at fracture is 340N? 6+, = pSFL g l-s.3uo..o-ou5 >sl00 ...
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- Fall '07