Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 3, Problem 40SDP
To determine
Design an actuator to turn on a switch when the temperature drops below a certain level. Use two materials with different coefficients of thermal expansion in your design.
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(d) A support rod for the landing gear of a private airplane is subjected to a tensile loading
landing. The loads are predicted to be as high as 40,000 pounds. Because the rod is
crucial and failure could lead to a loss of life, and as a responsible engineer, the rod
is to be designed with a factor safety of 4 (that is designed so that the rod is
capable of supporting loads for times as great as expected). Operation of the
system also produces loads that may induce cracks in the rod. Our non-destructive
testing equipment can detect any crack greater than 0.02 in deed. Based on the
materials given in Table Q2 (c), design the support Rod and the material, and
justify your answer.
Table Q2(c): The Plane Strain Fracture Toughness Kcof Selected Materials
Fracture Toughness Kie
(psi vin.)
Yield Strength or
Ultimate Strength (for Brittle Solids)
(psi)
Material
66,000
47,000
130,000
125,000
238,000
206,000
30,000
80,000
Al-Cu alloy
22,000
33,000
Ti-6% Al-4% V
50,000
90,000
45,800
Ni-Cr steel…
Compression springs are the most common spring configuration that product manufacturer's turn to
when enhanced product functionality is required. You are required to design a compression spring
that is made of oil-tempered wire of 4-mm diameter with a spring index of C=10. The spring will
operate inside a pipe, so buckling is not a problem and select the ends to be plain. The free length of
the spring should be 80 mm. A force of 50 N should deflect the spring 15 mm.
a) Calculate the spring rate and the solid length.
b) Calculate the total number of coils needed.
c) Calculate the minimum pipe diameter for the spring to operate in.
d) Calculate a static factor of safety based on the yielding of the spring if it is compressed
to its solid length.
Use FEM to calculate the temperature at nodes 2 and 3, and the heat at nodes 1 and 4. Assume A is one unit area.
Chapter 3 Solutions
Manufacturing Engineering & Technology
Ch. 3 - List several reasons that density is an important...Ch. 3 - Explain why the melting point of a material can be...Ch. 3 - What adverse effects can be caused by thermal...Ch. 3 - Prob. 4RQCh. 3 - What is the piezoelectric effect?Ch. 3 - Prob. 6RQCh. 3 - Prob. 7RQCh. 3 - What is the difference between thermal...Ch. 3 - What is corrosion? How can it be prevented or...Ch. 3 - Explain stress-corrosion cracking. Why is it also...
Ch. 3 - Prob. 11RQCh. 3 - Prob. 12RQCh. 3 - What is the fundamental difference between...Ch. 3 - Describe the significance of structures and...Ch. 3 - Prob. 15QLPCh. 3 - Note in Table 3.1 that the properties of the...Ch. 3 - Rank the following in order of increasing thermal...Ch. 3 - Prob. 18QLPCh. 3 - Explain how thermal conductivity can play a role...Ch. 3 - What material properties are desirable for heat...Ch. 3 - Prob. 21QLPCh. 3 - Prob. 22QLPCh. 3 - Two physical properties that have a major...Ch. 3 - Which of the materials described in this chapter...Ch. 3 - Which properties described in this chapter can be...Ch. 3 - If we assume that all the work done in plastic...Ch. 3 - The natural frequency, f, of a cantilever beam is...Ch. 3 - Plot the following for the materials described in...Ch. 3 - It can be shown that thermal distortion in...Ch. 3 - Add a column to Table 3.1 that lists the...Ch. 3 - Prob. 31SDPCh. 3 - Prob. 32SDPCh. 3 - Prob. 33SDPCh. 3 - Prob. 34SDPCh. 3 - Prob. 36SDPCh. 3 - Prob. 38SDPCh. 3 - Prob. 40SDPCh. 3 - Prob. 41SDPCh. 3 - Prob. 42SDPCh. 3 - Prob. 43SDP
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- Q#01: Define the following:a) Steady and Transient state of heat transfer by the help of an example.b) If the area, thickness and temperatures are same across the material. Justify whichmaterial will transfer more heat, either the material with high thermal conductivity valueor the material with low thermal conductivity value?c) If the area and temperatures are same across the material. Explain whether thermalconductivity will have any effect on thickness or not?arrow_forwardFrom the matrix can you show me how the value stiffness (k) calculated?arrow_forwardWhen lifting weights, it turns out the amount of force you need to lift them doesn't necessarily match the dumbbell's weight — in other words, if an object weighs 100 N, the amount of force you actually need to apply is probably not 100 N. Observe the diagram below: You can think of the bones in your arms as rods that rotate about an axis of rotation (your elbow) depending on the magnitude, direction and position of the forces being applied. So in order for your arm to lift the weight, the torque exerted by the bicep should be greater than or equal to the torques being applied by the bones' center of mass and the weight your hand is holding. Notice how the bicep is connected to the arm bone (the radius) at a certain distance from the joint, and applies an upwards tension force (as the bicep contracts in order to lift objects). Show how the magnitude of the tension force exerted by the biceps muscle can differ greatly from the magnitude of the weight.arrow_forward
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