We want to draw a 7.5 mm diameter copper wire having a yield strength of 140 MN.m² into a 6 mm diameter wire. Will the drawn wire break during the drawing process?

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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4.
We want to draw a 7.5 mm diameter copper wire having a yield strength of 140 MN.m²²
into a 6 mm diameter wire. Will the drawn wire break during the drawing process?
Strength (MN.m-2)
600
500
400
300
200
100
0
0
Tensile strength
20
Yield strength
% Elongation
60
40
Percent cold work
80
100
90
80
70
60
50
40
30
20
10
100
% Elongation
Transcribed Image Text:4. We want to draw a 7.5 mm diameter copper wire having a yield strength of 140 MN.m²² into a 6 mm diameter wire. Will the drawn wire break during the drawing process? Strength (MN.m-2) 600 500 400 300 200 100 0 0 Tensile strength 20 Yield strength % Elongation 60 40 Percent cold work 80 100 90 80 70 60 50 40 30 20 10 100 % Elongation
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why use yield strength not tensile strength? You are drawing wire which you want the wire to elongate pernamently, and not return back to original shape . 

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