The engineering stress and strain are defined relative to the instantaneous area and length of test specimen True O False In sheetmetal working processes, the surface area-to-volume ratio of w.p. is low True False Determine the value of the strain-hardening exponent for a metal that will cause the average flow stress to be 70% of the final flow stress after deformation 0.444 0.421 0.422 0.428 For pure copper (annealed), the strength coefficient = 330 MPa and strain-hardening exponent = 0.52 in the flow curve equation. Determine the average flow stress that the metal experiences if it is subjected to a stress that is equal to its strength coefficient K MPa 222 MPa 214 MPa 220 MPa 217 Average Flow Stress

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
At higher temperature, strength and strain hardening are increased,
whereas, ductility is decreased which permits greater plastic
deformation
True
False O
Saaly i
The strength constant (C) is increased with increasing of temperature
True O
False O
The metal is becoming weaker as strain increases, this is because of
.strain hardening (work hardening) property
True O
False O
ly
The engineering stress and strain are defined relative to the
instantaneous area and length of test specimen
True O
False O
In sheetmetal working processes, the surface area-to-volume ratio of
.w.p. is low
True O
False O
aly ihi Determine the value of the strain-hardening exponent for a metal that will
cause the average flow stress to be 70% of the final flow stress after
deformation
0.444
0.421
0.422
0.428
aaly i
For pure copper (annealed), the strength coefficient = 330 MPa and
strain-hardening exponent = 0.52 in the flow curve equation. Determine
the average flow stress that the metal experiences if it is subjected to a
.stress that is equal to its strength coefficient K
MPa 222
MPа 214
MPa 220
MPa 217
Average Flow
Stress
Transcribed Image Text:At higher temperature, strength and strain hardening are increased, whereas, ductility is decreased which permits greater plastic deformation True False O Saaly i The strength constant (C) is increased with increasing of temperature True O False O The metal is becoming weaker as strain increases, this is because of .strain hardening (work hardening) property True O False O ly The engineering stress and strain are defined relative to the instantaneous area and length of test specimen True O False O In sheetmetal working processes, the surface area-to-volume ratio of .w.p. is low True O False O aly ihi Determine the value of the strain-hardening exponent for a metal that will cause the average flow stress to be 70% of the final flow stress after deformation 0.444 0.421 0.422 0.428 aaly i For pure copper (annealed), the strength coefficient = 330 MPa and strain-hardening exponent = 0.52 in the flow curve equation. Determine the average flow stress that the metal experiences if it is subjected to a .stress that is equal to its strength coefficient K MPa 222 MPа 214 MPa 220 MPa 217 Average Flow Stress
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