DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 1, Problem 14RQ
It is acknowledged that chip�type machining is basically an inefficient process. Yet it is probably used more than any other to produce desired shapes. Why?
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Question 1
A three-blade propeller of a diameter of 2 m has an activity factor AF of 200 and its
ratio of static thrust coefficient to static torque coefficient is 10. The propeller's
integrated lift coefficient is 0.3.
A close end tube of thin-walled circular section may be subjected to torque 7 and internal pressure P, as shown in Figure Q3. The shear stress in the wall caused by
the torque can be calculated as T = T/(2πR²t), where the mean radius of the cross section is R (i.e., the radius of the centreline of the wall) and the wall thickness
is t. The internal radius of the tube can be calculated as (R-t/2). However, as R>>t, you can approximately assume that the internal radius of the tube is equal to Rin
the subsequent calculation. The tube is made from a material with Young's modulus E, Poisson's ratio v.
Orr
T
t
P
Ozz
бөө
Orr
Z
T
Ozz
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Figure Q3
Centreline of
the wall
R
(a) If the change of the diameter cannot exceed 0.1 m under elastic deformation, calculate the minimum allowable wall thickness of the cylindrical pressure vessel if
P=23.6 MPa, T=0 KN.m, R = 2 m, Young's modulus E = 246 GPa, and Poisson's ratio v = 0.21.
Question2
The mission profile for a jet driven aircraft consists of the following segments: engine
start and warm-up, taxi, take-off, climb to the cruise altitude of 35000 ft, descend to
10000 ft, one hour loiter at this altitude at 60% of the cruise speed, flight at loiter
speed and altitude to an alternate airport (100 nm), descend to landing approach
condition followed by the final landing, taxi and shutdown.
The cruise Mach number is 0.8. No provisions are made for the reserved fuel or any
trapped oil and fuel. The aircraft carries 200 people (including pilots and the cabin
crew) at 175 lb each and 90 lb baggage each. This aircraft has a wing area of 2000
ft²
L/D at cruise
L/D at 10000ft flight
Table Q2
20
16
0.43 lb/hr/lb
0.50 lb/hr/lb
C: Specific Fuel Consumption at cruise:
C: Specific Fuel Consumption at 10000 ft flight:
Weight ratios
Engine Start and warm-up
Taxi
Take-off
Climb
Descent
Landing, taxi and shutdown
0.992
0.996
0.996
0.996
0.992
0.992
Question 2 continues on the…
Chapter 1 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 1 - What role does manufacturing play relative to the...Ch. 1 - Arent all goods really consumer goods, depending...Ch. 1 - The Subway sandwich shop is an example of a job...Ch. 1 - How does a system differ from a process? From a...Ch. 1 - Is a cutting tool the same thing as a machine...Ch. 1 - What are the major classifications of basic...Ch. 1 - Casting is often used to produce a...Ch. 1 - In the lost�wax casting process, what happens to...Ch. 1 - In making a gold medal, what do we mean by a...Ch. 1 - How is a railroad station like a station on an...
Ch. 1 - Because no work is being done on a part when it is...Ch. 1 - What forming processes are used to make a paper...Ch. 1 - What is tooling in a manufacturing system?Ch. 1 - It is acknowledged that chipâ€�type machining is...Ch. 1 - Compare Figures 1.1 and 1.16. What are the...Ch. 1 - In a modern safety razor with three or four blades...Ch. 1 - List three purposes of packaging operations.Ch. 1 - Assembly is defined as the putting together of...Ch. 1 - What are the physical elements in a manufacturing...Ch. 1 - In the production system, who usually figures out...Ch. 1 - In Figure 1.8, what do the lines connecting the...Ch. 1 - Characterize the process of squeezing toothpaste...Ch. 1 - It has been said that low-cost products are more...Ch. 1 - Prob. 24RQCh. 1 - If the rolls for the cold-rolling mill that...Ch. 1 - Make a list of service systems, giving an example...Ch. 1 - What is the fundamental difference between a...Ch. 1 - Prob. 28RQCh. 1 - What kind of process is powder metallurgy: casting...Ch. 1 - In view of Figure 1.2, who really determines the...Ch. 1 - What costs make up manufacturing cost (sometimes...Ch. 1 - What are major phases of a product life cycle?Ch. 1 - How many different manufacturing systems might be...Ch. 1 - In general, as the annual volume for a product...Ch. 1 - The Toyota truck plant in Indiana produces 150,000...Ch. 1 - A company is considering making automobile bumpers...Ch. 1 - Many companies are critically examining the...Ch. 1 - We can analogize your university to a...Ch. 1 - What kind of manufacturing system (design) is your...Ch. 1 - What are the major process steps in the assembly...Ch. 1 - What is the relationship between Figures 1.2Â...
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