Answered: What are the Brinell and Rockwell…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Both tensile strength and hardness are indicators of a metal’s resistance to plastic deformation. Consequently, they are roughly proportional as shown in Figure 4b (ii) below for different types of metals including brass, thus the hardness values can be estimated from the material’s Ultimate Tensile Stress (UTS) and vice versa. What are the Brinell and Rockwell hardness numbers for the brass specimen with its engineering stress/strain curve shown in Figure 4b (i)?

Rockwell hardness
60 70 80 90
100 HRB
20 30
40
50 HRC
500
1500
Steels
400
1000
300
200
500
Brass
Cast iron (nodular)
100
100
200
300
400
500
0.10
0.20
0.30
0.40
Brinell hardness number
Strain
Figure for 4b (i) – Engineering Stress &
Strain Plot for a Brass Specimen
Figure for 4b (ii) – UTS Against
Brinell and Rockwell Hardness
Numbers for a Range of Steels, Cast
Iron and Brass Alloys
Stress (MPa)
Tensile strength (MPa)

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