Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 2, Problem 1RQ
Distinguish between engineering stress and true stress.
Expert Solution & Answer
To determine
Distinguish between Engineering stress and True stress.
Explanation of Solution
Engineering stress | True stress |
1. Engineering stress is defined as the ration of normal applied force to the original cross sectional area. |
1. True stress is the instantaneous ratio of applied force to the instant cross sectional area. |
2. It includes original cross section area which is maximum area. |
2. It includes the instantaneous cross section area, which is not maximum area. |
3. Engineering value is less then true stress value. |
3. Its value is more than engineering stress. |
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A crate weighs 530 lb and is hung by three ropes attached to
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xy plane. Point A is located at a height of h = 42 in above
the top of the crate directly over the geometric center of the
top surface. Use the dimensions given in the table below to
determine the tension in each of the three ropes.
2013 Michael Swanbom
cc00
BY NC SA
↑ Z
C
b
B
У
a
D
Values for dimensions on the figure are given in the following
table. Note the figure may not be to scale.
Variable Value
a
30 in
b
43 in
4.5 in
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x lb
The tension in rope AC is 156
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The tension in rope AD is 156
x lb
A block of mass m hangs from the end of bar AB that is 7.2
meters long and connected to the wall in the xz plane. The
bar is supported at A by a ball joint such that it carries only a
compressive force along its axis. The bar is supported at end
B by cables BD and BC that connect to the xz plane at
points C and D respectively with coordinates given in the
figure. Cable BD is elastic and can be modeled as a linear
spring with a spring constant k = 400 N/m and unstretched
length of 6.34 meters.
Determine the mass m, the compressive force in beam AB
and the tension force in cable BC.
Z
C
D
(c, 0, d)
(a, 0, b)
A
B
y
f
m
cc 10
BY
NC SA
2016 Eric Davishahl
x
Values for dimensions on the figure are given in the following
table. Note the figure may not be to scale.
Variable Value
a
8.1 m
b
3.3 m
с
2.7 m
d
3.9 m
e
2 m
f
5.4 m
The mass of the block is 68.8
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× kg.
× N.
The tension in cable BC is 393
× N.
Chapter 2 Solutions
Manufacturing Engineering & Technology
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