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 13, Problem 69RQ
To determine
The casting process with the help of computer simulation.
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**Problem 8-45.** The man has a mass of 60 kg and the crate has a mass of 100 kg. If the coefficient of static friction between his shoes and the ground is \( \mu_s = 0.4 \) and between the crate and the ground is \( \mu_c = 0.3 \), determine if the man is able to move the crate using the rope-and-pulley system shown. **Diagram Explanation:** The diagram illustrates a scenario where a man is attempting to pull a crate using a rope-and-pulley system. The setup is as follows: - **Crate (C):** Positioned on the ground with a rope attached. - **Rope:** Connects the crate to a pulley system and extends to the man. - **Pulley on Tree:** The rope runs over a pulley mounted on a tree which redirects the rope. - **Angles:** - The rope between the crate and tree forms a \(30^\circ\) angle with the horizontal. - The rope between the tree and the man makes a \(45^\circ\) angle with the horizontal. - **Man (A):** Pulling on the rope with the intention of moving the crate. This arrangement tests the…
Chapter 13 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 13 - What are the six activities that are conducted on...Ch. 13 - What is materials processing?Ch. 13 - What are the five basic families of...Ch. 13 - Describe the capabilities of the casting process...Ch. 13 - What are some of the various mold materials and...Ch. 13 - How might the desired production quantity...Ch. 13 - Why is it important to provide a means of venting...Ch. 13 - What types of problem or defect can occur if the...Ch. 13 - Why might product removal be less of a problem...Ch. 13 - What is a casting pattern? Flask? Core? Mold...
Ch. 13 - In a horizontally parted two-part mold, what is...Ch. 13 - What are some of the components that combine to...Ch. 13 - What is a parting line or parting surface?Ch. 13 - What is draft, and why is it used?Ch. 13 - Why is it important to control the solidification...Ch. 13 - What are the two stages of solidification, and...Ch. 13 - Why is it that most solidification does not begin...Ch. 13 - Why might it be desirable to promote nucleation in...Ch. 13 - Nucleation generally begins at preferred sites...Ch. 13 - Why might directional solidification be desirable...Ch. 13 - Describe some of the key features observed in the...Ch. 13 - What is superheat?Ch. 13 - Prob. 23RQCh. 13 - What is a liquidus temperature? A solidus...Ch. 13 - What is the freezing range for a metal or alloy?Ch. 13 - Discuss the roles of casting volume and surface...Ch. 13 - What characteristics of a specific casting process...Ch. 13 - What is the correlation between cooling rate and...Ch. 13 - What is the chill zone of a casting, and why does...Ch. 13 - Which of the three regions of a cast structure is...Ch. 13 - What is dross or slag, and how can it be prevented...Ch. 13 - What are some of the possible approaches that can...Ch. 13 - What is a misrun or cold shut, and what causes...Ch. 13 - What is fluidity, and how can it be measured?Ch. 13 - What is the most important factor controlling the...Ch. 13 - What defect can form in sand castings if the...Ch. 13 - Why is it important to design the geometry of the...Ch. 13 - Why might it be preferable to attach gates to the...Ch. 13 - Prob. 39RQCh. 13 - What are some desirable features in the sprue...Ch. 13 - What is a choke, and how does its placement affect...Ch. 13 - What features can be incorporated into the gating...Ch. 13 - What are some of the materials and designs of...Ch. 13 - What factors might influence the positioning of...Ch. 13 - What features of the metal being cast tend to...Ch. 13 - What are the three stages of contraction or...Ch. 13 - Why is it more difficult to prevent shrinkage...Ch. 13 - What steps can be taken to compensate for the...Ch. 13 - During what stage of shrinkage might hot tears...Ch. 13 - What is the role of a riser?Ch. 13 - Why is it desirable to design a casting to have...Ch. 13 - What is yield, and how does it relate to the...Ch. 13 - Based on Chvorinovs rule, what would be an ideal...Ch. 13 - Define the following riser-related terms: top...Ch. 13 - What assumptions were made when using Chvorinovs...Ch. 13 - Discuss aspects relating to the connection between...Ch. 13 - What is the purpose of a chill? Of an insulating...Ch. 13 - What are some materials that are commonly used to...Ch. 13 - What types of modifications or allowances are...Ch. 13 - Prob. 60RQCh. 13 - What is the purpose of a draft or taper on pattern...Ch. 13 - Why is it desirable to make the pattern allowances...Ch. 13 - What additional adjustment or correction must be...Ch. 13 - What are some of the features of the casting...Ch. 13 - Prob. 65RQCh. 13 - What are some design recommendations for inside...Ch. 13 - What are some appearance considerations in parting...Ch. 13 - Prob. 68RQCh. 13 - Prob. 69RQCh. 13 - Using Chvorinovs rule as presented in the text...Ch. 13 - Reposition the riser in Problem 1 so that it sits...Ch. 13 - A rectangular casting having the dimensions 3 in....Ch. 13 - A cylinder with a diameter of 2.5 in. and a height...Ch. 13 - Figure 13.Ashows the wall profile of a cast iron...Ch. 13 - Investigate various experimental techniques to...Ch. 13 - Porosity within a casting can be either...Ch. 13 - The chapter text describes various materials that...Ch. 13 - What is the most likely source of the gas bubbles?...Ch. 13 - What factors may have caused the penetration...Ch. 13 - Prob. 3CSCh. 13 - Prob. 4CSCh. 13 - Prob. 5CS
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- PROBLEM 11: Determine the force, P, that must be exerted on the handles of the bolt cutter. (A) 7.5 N (B) 30.0 N (C) 52.5 N (D) 300 N (E) 325 N .B X 3 cm E 40 cm cm F = 1000 N 10 cm 3 cm boltarrow_forwardUsing the moment-area theorems, determine a) the rotation at A, b) the deflection at L/2, c) the deflection at L/4. (Hint: Use symmetry for Part a (θA= - θB, or θC=0), Use the rotation at A for Parts b and c. Note that all deformations in the scope of our topics are small deformation and for small θ, sinθ=θ).arrow_forwardDistilled water is being cooled by a 20% propylene glycol solution in a 1-1/U counter flow plate and frame heat exchanger. The water enters the heat exchanger at 50°F at a flow rate of 86,000 lbm/h. For safety reasons, the water outlet temperature should never be colder than 35°F. The propylene glycol solution enters the heat exchanger at 28°F with a flow rate of 73,000 lbm/h. The port distances on the heat exchanger are Lv = 35 in and Lh = 18 in. The plate width is Lw = 21.5 2 in. The plate thickness is 0.04 in with a plate pitch of 0.12 in. The chevron angle is 30° and the plate enlargement factor is 1.17. All ports have a 2 in diameter. The fouling factor of the propylene glycol solution can be estimated as 2 ×10−5 h-ft2-°F/Btu. a. Determine the maximum number of plates the heat exchanger can have while ensuring that the water outlet temperature never drops below 35°F. b. Determine the thermal and hydraulic performance of the heat exchanger with the specified number of plates.…arrow_forward
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