Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 14, Problem 10RQ
To determine
The material used to make a thermistor.
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A countershaft carrying two V-belt pullets is shown in the figure. Pulley A receives power
from a motor through a belt with the belt tensions shown. The power is transmitted through
the shaft and delivered to the belt on pulley B. Assume the belt tension on the loose side
(T1) at B is 30% of the tension on the tight side (T2).
(a) Determine the tension (i.e., T₂ and T₁) in the belt on pulley B, assuming the shaft is
running at a constant speed.
(b) Find the magnitudes of the bearing reaction forces, assuming the bearings act as
simple supports.
(c) Draw shear-force and bending moment diagrams for the shaft (in XZ and XY plane
if needed).
(d) Calculate the maximum moments at points A and B respectively and find the point
of maximum bending moment (A or B).
(e) Find maximum stresses (tensile, compressive, and shear stresses) at the identified
point of maximum moment (hint: principal and max shear stresses)
8 dia.
9
400lbf
50lbf
45°
1.5 dia.
T₂
B
Units in inches
T₁
10 dia.
The cantilevered bar in the figure is made from a ductile material and is statically loaded
with F,, = 200 lbf and Fx = F₂ = 0. Analyze the stress situation in rod AB by obtaining
the following information. Note that the stress concentration factors are neglected in the
following questions (Kt and Kts=1).
(a) Determine the precise location of the critical stress element.
(b) Sketch the critical stress element and determine magnitudes and direction for all
stresses acting on it. (Transverse shear may only be neglected if you can justify this
decision.)
(c) For the critical stress element, determine the principal stresses and maximum shear
stress.
6 in
1-in dia.
B
+1-
in
in
2 in
5 in
A laminated thick-walled hydraulic cylinder was fabricated by shrink-fitting
jacket having an outside diameter of 300mm onto a SS 304 steel tube having an inside
diameter of 100mm and an outside diameter of 200mm as shown in the figure. The
interference (8) was 0.15mm. When the Young's modulus for both SS304 and 1020 steel
is the same as 200GPa, and the Poisson's ratio is also the same as 0.3 for both materials,
find the followings.
Initially 100 mm
Initially 200 mm
Initially 300 mm
SS 304
1020 steel
(a) P; (interfacial contact stress)
(b) The maximum stresses (σ, and σ+) in the laminated steel cylinder resulting from the
shrink fit.
Chapter 14 Solutions
Industrial Motor Control
Ch. 14 - Should a metal bar be heated or cooled to make it...Ch. 14 - Prob. 2RQCh. 14 - Prob. 3RQCh. 14 - Why are bimetal strips often formed into a spiral...Ch. 14 - Why should electrical contacts never be permitted...Ch. 14 - What two factors determine the amount of voltage...Ch. 14 - Prob. 7RQCh. 14 - Prob. 8RQCh. 14 - Prob. 9RQCh. 14 - Prob. 10RQ
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