MECHANICS OF MATERIALS
11th Edition
ISBN: 9780137605521
Author: HIBBELER
Publisher: RENT PEARS
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Textbook Question
Chapter 9.4, Problem 61P
Draw Mohr’s circle that describes each of the following states of stress.
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Exam-2-Tribology
Q1: What are the assumptions of hydrodynamic lubrication theory:
Q2: Explain with sketch the cycle or process of engine lubrication system-pressurized
lubrication system
Q3: A short bearing is designed to operate with an eccentricity ratio = 0. 7. The journal
diameter is 60 mm, and its speed is 1300 r.p.m. The journal is supported by a short
hydrodynamic bearing of length L/D = 0. 5, and clearance ratio C/R = 103. The radial load
on the bearing is 9800 N.
a. Find the Sommerfeld number.
b. Find the minimum viscosity of the lubricant for operating at ε = 0.7
c. Select a lubricant if the average bearing operating temperature is 70°c
Q4: Two parallel circular disks of 100 mm diameter have a clearance of Imm between them.
Under load, the downward velocity of the upper disk is 2 m/s. At the same time, the lower disk
is stationary. The clearance is full of SAE 40 oil at a temperature of 60°c.
a. Find the load on the upper disk that results in the instantaneous…
Tribobolgy
15/2022
Monthly Exam.
Automobile Eng. Dert
2nd Semster/3rd class
Max. Mark: 100%
7. Viscosity of multi-grade oils
(a) Reduces with temperature
(c) is less sensitive to temperature
(b) Increases with temperature
(d) None of the above
8. In a hydrodynamic journal bearing if eccentricity ratio = 1, it means
(a) Journal/shaft is subjected to no load and the rotational speed is very high.
(b) Journal is subjected to no load and the rotational speed is moderate
(c) Journal is subjected to very light load and the rotational speed is very high.
(d) Journal is subjected to very high load and the rotational speed is negligible.
Q4/ The journal speed of a 100mm diameter journal is 2500 rpm. The journal is supported by
a short hydrodynamic bearing of length L=0.6D, eccentricity ratio = 0.75 and a clearance
ratio C/R=0.001. The radial load on the bearing is 10 kN. The lubricant is SAE 30, and the
operating temperature of the lubricant in the bearing is 700C.
1- Assume…
Chapter 9 Solutions
MECHANICS OF MATERIALS
Ch. 9.3 - Determine the normal stress and shear stress...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - Also, find the corresponding orientation of the...Ch. 9.3 - Determine the equivalent state of stress on an...Ch. 9.3 - Determine the maximum principal stress at point B.Ch. 9.3 - Determine the principal stress at point C.Ch. 9.3 - Determine the stress components acting on the...Ch. 9.3 - Solve Prob.99 using the stress transformation...Ch. 9.3 - Determine the stress components acting on the...Ch. 9.3 - Determine the equivalent state of stress on an...
Ch. 9.3 - The stress along two planes at a point is...Ch. 9.3 - The state of stress at a point in a member is...Ch. 9.3 - The wood beam is subjected to a load of 12 kN. If...Ch. 9.3 - The internal loadings at a section of the beam are...Ch. 9.3 - Solve Prob.925 for point B. 925. The internal...Ch. 9.3 - Solve Prob.925 for point C. 925. The internal...Ch. 9.3 - It is subjected to a torque of 12 kip in. and a...Ch. 9.3 - A paper tube is formed by rolling a cardboard...Ch. 9.3 - Solve Prob.931 for the normal stress acting...Ch. 9.3 - Determine the principal stresses in the...Ch. 9.3 - The shaft has a diameter d and is subjected to the...Ch. 9.4 - Use Mohrs circle to determine the normal stress...Ch. 9.4 - Also, find the corresponding orientation of the...Ch. 9.4 - Draw Mohrs circle and determine the principal...Ch. 9.4 - Determine the principal stresses at a point on the...Ch. 9.4 - Determine the principal stresses at point A on the...Ch. 9.4 - Point A is just below the flange.Ch. 9.4 - Mohrs circle for the state of stress is shown in...Ch. 9.4 - Determine (a) the principal stresses and (b) the...Ch. 9.4 - Determine the equivalent state of stress if an...Ch. 9.4 - Draw Mohrs circle that describes each of the...Ch. 9.4 - Draw Mohrs circle trial describes each of the...Ch. 9.4 - Determine (a) the principal stresses and (b) the...Ch. 9.4 - Determine (a) the principal stresses and (b) the...Ch. 9.4 - Draw Mohrs circle that describes each of the...Ch. 9.4 - The grains of wood in the board make an angle of...Ch. 9.4 - A spherical pressure vessel has an inner radius of...Ch. 9.4 - The cylindrical pressure vessel has an inner...Ch. 9.4 - If the box wrench is subjected to the 50 lb force,...Ch. 9.4 - If the box wrench is subjected to the 50-lb force,...Ch. 9.5 - Draw the three Mohrs circles that describe each of...Ch. 9.5 - Draw the three Mohrs circles that describe the...Ch. 9.5 - Determine the principal stresses and the absolute...Ch. 9.5 - The solid shaft is subjected to a torque, bending...Ch. 9.5 - The frame is subjected to a horizontal force and...Ch. 9 - Prob. 1RPCh. 9 - The steel pipe has an inner diameter of 2.75 in....Ch. 9 - Determine the equivalent state of stress If an...Ch. 9 - The crane is used to support the 350-lb load....Ch. 9 - Determine the equivalent state of stress on an...Ch. 9 - The propeller shaft of the tugboat is subjected to...Ch. 9 - Determine the principal stresses in the box beam...Ch. 9 - Determine (a) the principal stresses and (b) the...Ch. 9 - Determine the stress components acting on the...
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