Quiz%202%20-%20soln%206

Quiz%202%20-%20soln%206 - b iii iv 4 The decrease in...

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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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