Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 11, Problem 11.3P
To determine
Compare the expected fracture strength of defective glass windshield with new one.
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Question 4. A tensile test is carried out on a bar of mild steel of diameter 2 cm. The bar yields under a load of 80 Kn.
It reaches a maximum load of 150 kN, and breaks finally at a load of 70 kN.
Estimate:
a)the tensile stress at the yield point
b)the ultimate tensile stress
c)the average stress at the breaking point if the diameter of the fractured neck is 1 cm.
Assuming you have been offered a job position as the lead Engineer to supervise the restoration of a steel bridge that collapsed
due to fracture. The laboratory results of the wreckage (a truss) given to you show an internal crack whose length is 0.026 mm
and radius of curvature is 0.00028mm. If the material theoretical fracture strength is 2000 MPa, determine the allowable
applied stress.
O a. 145.10 MPa
O b. 135.65 MPa
OC. 128.17 MPa
Od. 156.04 MPa
O e. 146.76 MPa
The (G-E) diagram obtained in the tensile test performed on a metal sample with a
diameter of 16 mm is as follows. The loads at points A, B and C and the elongation measured
on l. 16 cm gauge length were determined as follows:
B
A
B
C
Load (kgf)
4800
8400
7200
Elongation (mm)
0.192
28.8
38.4
c) Calculate the fracture work and the maximum elastic energy the metal rod can store.
d) Find the cross-sectional area of a 6 m long rod made of this metal such that it can carry 12
tons of load with 2 times the safety of yield strength. How long does the rod extend under
this load?
Chapter 11 Solutions
Materials Science And Engineering Properties
Ch. 11 - Prob. 1CQCh. 11 - Prob. 2CQCh. 11 - Prob. 3CQCh. 11 - Prob. 4CQCh. 11 - Prob. 5CQCh. 11 - Prob. 6CQCh. 11 - Prob. 7CQCh. 11 - Prob. 8CQCh. 11 - Prob. 9CQCh. 11 - Prob. 10CQ
Ch. 11 - Prob. 11CQCh. 11 - Prob. 12CQCh. 11 - Prob. 13CQCh. 11 - Prob. 14CQCh. 11 - Prob. 15CQCh. 11 - Prob. 16CQCh. 11 - Prob. 17CQCh. 11 - Prob. 18CQCh. 11 - Prob. 19CQCh. 11 - Prob. 20CQCh. 11 - Prob. 21CQCh. 11 - Prob. 22CQCh. 11 - Prob. 23CQCh. 11 - Prob. 24CQCh. 11 - Prob. 25CQCh. 11 - Prob. 26CQCh. 11 - Prob. 27CQCh. 11 - Prob. 28CQCh. 11 - Prob. 29CQCh. 11 - Prob. 30CQCh. 11 - Prob. 1ETSQCh. 11 - Prob. 2ETSQCh. 11 - Prob. 3ETSQCh. 11 - Prob. 4ETSQCh. 11 - Prob. 5ETSQCh. 11 - Prob. 6ETSQCh. 11 - Prob. 7ETSQCh. 11 - Prob. 8ETSQCh. 11 - Prob. 9ETSQCh. 11 - Prob. 10ETSQCh. 11 - Prob. 11.1PCh. 11 - Prob. 11.2PCh. 11 - Prob. 11.3PCh. 11 - Prob. 11.4PCh. 11 - Prob. 11.5PCh. 11 - Prob. 11.6PCh. 11 - Prob. 11.7PCh. 11 - Prob. 11.8PCh. 11 - Prob. 11.9PCh. 11 - Prob. 11.10PCh. 11 - Prob. 11.11PCh. 11 - Prob. 11.12PCh. 11 - Prob. 11.13PCh. 11 - Prob. 11.14P
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