Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 2, Problem 69QTP
The design specification for a metal requires a minimum hardness of 80 HRA. If a Rockwell test is performed and the depth of penetration is 60 μm, is the material acceptable?
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What are the different types of Indenters used in Rockwell Hardness Testing?
Determine the indentation diameter and the surface area of indentation of a copper material subjected to a Brinell hardness test with a test force of 9.4 kN using a hardened steel ball indentor of 10 mm. Take the Brinell Hardness Number as 955.
Solution:
i) Indentation Diameter (in mm) =
ii) Surface Area of Indentation (in mm2) =
A tensile test for a copper specimen has been performed and the following data are obtained.
- Percentage of Elongation = 66 %
- Percentage of Reduction in Area = 38 %
- Final length after fracture = 34.6 mm
- Final Diameter after fracture = 4.43 mm &
- Ultimate stress = 364
MPa Determine the Initial length, Initial diameter and Maximum load.
i) Initial Length (in mm) =
ii) Final Area (in mm2) =
iii) Initial Area (in mm2) =
iv) Initial Diameter (in mm) =
v) Ultimate Load (in N) =
Chapter 2 Solutions
Manufacturing Engineering & Technology
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- Explain the importance of the Rockwell hardness test to obtain an approximation of tensile strengtharrow_forwardDetermine the surface area of indentation for a specimen that has Brinell hardness number as 851 and the applied force as 15 kN. The surface area of indentation (mm2) = %3Darrow_forwardA tensile test for a copper specimen has been performed and the following data are obtained. - Percentage of Elongation = 65 % - Percentage of Reduction in Area = 39 % - Final length after fracture = 36.1 mm - Final Diameter after fracture = 4.25 mm & - Ultimate stress = 401 MPa SOLUTION: Initial Diameter (in mm) = Ultimate Load (in N) =arrow_forward
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