Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 2, Problem 57QTP
Percent elongation is always defined in terms of the original gage length, such as 50 mm or 2 in. Explain how percent elongation would vary as the gage length of the tensile-test specimen increases. (Hint: Recall that necking is a local phenomenon.)
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The following data are obtained from a tensile test of a copper specimen.
- The load at the yield point is 143 kN.
- Length of the specimen is 29 mm.
- The yield strength is 71 kN/mm2.
- The percentage of elongation is 48 %.
Determine the following
Diameter of the specimen,
Final length of the specimen,
Stress under an elastic load of 18 kN,
Young's Modulus if the elongation is 1 mm at 18 kN and
Final diameter if the percentage of reduction in area is 29 %.
Initial Cross-sectional Area 2.01 mm2.
The Diameter of the Specimen 1.59 mm.
Final Length of the Specimen 42.92 mm.
Stress at the elastic load 8955.22 N/mm2.
Find:
Young's Modulus of the Specimen (in N/mm2)
Final Area of the Specimen at Fracture (in mm)
Final Diameter of the Specimen after Fracture (in mm)
The following data are obtained from a tensile test of a copper specimen.
- The load at the yield point is 157 kN.
- Length of the specimen is 23 mm.
- The yield strength is 89 kN/mm2.
- The percentage of elongation is 45 %.
Determine the following
Diameter of the specimen,
Final length of the specimen,
Stress under an elastic load of 18 kN,
Young's Modulus if the elongation is 1.3 mm at 18 kN
and
Final diameter if the percentage of reduction in area is
25 %.
Fine this ans
1-Initial Cross-sectional Area (in mm2)
2-The Diameter of the Specimen (in mm)
3-Final Length of the Specimen (in mm)
4-Stress at the elastic load (in N/mm2)
5-Young's Modulus of the Specimen (in N/mm2)
6-Final Area of the Specimen at Fracture (in mm)
7-Final Diameter of the Specimen after Fracture (in mm)
Your manager asked you to explain the difference between three-point bending test and four-pointbending test by using a standard specimen each one has the following dimensions:1. Force = 30 KN.2. Thickness= 5 cm.3. Width = 10 cm.4. Length = 25 cm.Calculate the stress on each specimen then justify your answer
Chapter 2 Solutions
Manufacturing Engineering & Technology
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