EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Textbook Question
Chapter 20, Problem 28QTP
The extruder head in a fused-deposition modeling setup has a diameter of 1.25 mm (0.05 in.) and produces layers that are 0.25 mm (0.01 in.) thick. If the extruder head and polymer extrudate velocities are both 40 mm/s, estimate the production time for the generation of a 38-mm (1.5-in.) solid cube. Assume that there is a 10-second delay between layers as the extruder head is moved over a wire brush for cleaning.
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An aluminum rod of length L
=
1m has mass density p = 2700 kg and
Young's modulus E = 70 GPa. The rod is fixed at both ends. The exact
natural eigenfrequencies of the rod are wexact
E
=
√
ρ
for n=1,2,3,. . . .
1. What is the minimum number of linear elements necessary to
determine the fundamental frequency w₁ of the system? Discretize
the rod in that many elements of equal length, assemble the global
system of equations KU = w² MU, and find the fundamental
frequency w₁. Compute the relative error e₁ = (w1 - wexact) /w exact
Sketch the fundamental mode of vibration.
2. Use COMSOL to solve the same problem. Show the steps necessary
to find the fundamental frequency and mode of the rod. What is the
relative error using linear elements and a normal mesh?
A ball with a mass of 5.0 kg is hanging from a string and is initially at rest.
A bullet with a mass of 10.0 g and a velocity of 200.0 m/s is fired at the ball.
The bullet embeds itself inside the ball.
How high (h) do the ball and the bullet rise?
Gravitational acceleration: g=9.81g = 9.81g=9.81 m/s².
Don't use chatgpt.
Need handwritten solution.
Mechanical engineering
Chapter 20 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 20 - What is the basic difference between additive...Ch. 20 - What is stereolithography?Ch. 20 - What is virtual prototyping, and how does it...Ch. 20 - What is fused-deposition modeling?Ch. 20 - Prob. 5RQCh. 20 - Prob. 6RQCh. 20 - Explain what each of the following means: (a) 3DP,...Ch. 20 - What starting materials can be used in...Ch. 20 - What are the cleaning and finishing operations in...Ch. 20 - Which rapid-prototyping technologies do not...
Ch. 20 - What are the advantages of electron beam melting?Ch. 20 - What is the Keltool process?Ch. 20 - What is a self-replicating machine?Ch. 20 - Which rapid-prototyping operations can produce...Ch. 20 - Which rapid-prototyping operations can produce...Ch. 20 - How can a mold for sand casting be produced using...Ch. 20 - Examine a ceramic coffee cup and determine in...Ch. 20 - How would you rapidly manufacture tooling for...Ch. 20 - Explain the significance of rapid tooling in...Ch. 20 - List the processes described in this chapter that...Ch. 20 - Few parts in commercial products today are...Ch. 20 - Can rapid-prototyped parts be made of paper?...Ch. 20 - Careful analysis of a rapid-prototyped part...Ch. 20 - Why are the metal parts in three-dimensional...Ch. 20 - Make a list of the advantages and limitations of...Ch. 20 - In making a prototype of a toy automobile, list...Ch. 20 - Using an approximate cost of 400 per gallon for...Ch. 20 - The extruder head in a fused-deposition modeling...Ch. 20 - Using the data for Problem 20.28 and assuming that...Ch. 20 - Rapid-prototyping machines represent a large...Ch. 20 - One of the major advantages of stereolithography...Ch. 20 - A manufacturing technique is being proposed that...Ch. 20 - Identify the rapid-prototyping processes described...Ch. 20 - Design a machine that uses rapid-prototyping...Ch. 20 - Because of relief of residual stresses during...Ch. 20 - Prob. 37SDPCh. 20 - Prob. 39SDPCh. 20 - Prob. 40SDP
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