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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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
Chapter 2 Solutions
Manufacturing Engineering & Technology
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