Question

Summer 2 Name: Question 3: (10 points) A cylindrical specimen of cold-worked copper has ductility (%EL) of 30%. (a) If its cold worked radius is 6.4 mm, what was its radius before deformation? (b)What are its tensile and yield strengths? 140 120 800 900 1040 Steel 1040 S 700 800 100 120 600 a700 80 100 E 500 600 400 Br Brass 500 300 Capper 40 400 200 Capper 300 20 100 200 10 20 30 40 50 70 10 20 30 50 Prcent cold work 40 60 70 Percent cold work 70 60 50 40 Brass 30 20 1040 Steel 10 Copper 0P 20 10 30 40 60 70 50 Percent cold work 800 Bugs usue uuas paA

Answer 1

Sol Given data, elongatian= 30-/ entoge af PeTce -.EL-2- Lo *. EL = LギーLメ10D Lo Lt-L elengation O.3 Lo Le-Lo O.3 Lf (b) O3 Lo 0-3ニ).3 = |+ Lo V

Constantacy uef Voume AD Lo= AR Le ExT de de - 6.4m that a Given 1 do o deLf Lo 1.3 x64 d 53. 248 do 7.297 mm b) Ten stle and yiddd strength's B0 -1. EL Copper O V

8m Tenle stsergth Vs.keold od Jraph (graph 2) P& Coppe Cold wdt 6 30-/ The Tensile Strength mi t be asoamd 30 MPa Syt e Intevsectn Point 320 Mpa Vc Cold wt graph Cragh 1) @0 COld wolkthe interse tion Point 0ung 290 mpa 290 Mfa O V
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