Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Chapter 8, Problem 41RQ
What kinds of plastics are most easily recycled?
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1. The truss shown is supported by hinge at A and cable at E.Given: H = 4m, S = 1.5 m, α = 75⁰, θ = 33⁰.Allowable tensile stress in cable = 64 MPa.Allowable compressive stress in all members = 120 MPaAllowable tensile stress in all members = 180 MPa1.Calculate the maximum permissible P, in kN, if the diameter of the cable is 20 mm.2.If P = 40 kN, calculate the required area (mm2) of member BC.3. If members have solid square section, with dimension 15 mm, calculate the maximum permissible P (kN) based on the allowable strength of member HI.ANSWERS: (1) 45.6 kN; (2) 83.71 mm2; (3) 171.76 kN
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2: A wire 4 meters long is stretched horizontally between points 4 meters apart. The wire is 25 mm2 in cross-section with a modulus of elasticity of 200 GPa. A load W placed at the center of the wire produces a sag Δ.1.Calculate the tension (N) in the wire if sag Δ = 30 mm.2.Calculate the magnitude of W, in N, if sag Δ = 54.3 mm.3. If W is 60 N, what is the sag (in mm)?ANSWERS: (1) 562 N, (2) 100 N, (3) 45.8 N
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4 : A cable and pulley system at D is used to bring a 230-kg pole (ACB) to a vertical position as shown. The cable has tensile force T and is attached at C. The length of the pole is 6.0 m, the outer diameter is d = 140 mm, and the wall thickness t = 12 mm. The pole pivots about a pin at A. The allowable shear stress in the pin is 60 MPa and the allowable bearing stress is 90 MPa. The diameter of the cable is 8 mm.1.Find the minimum diameter (mm) of the pin at A to support the weight of the pole in the position shown.2.Calculate the elongation (mm) of the cable CD.3.Calculate the vertical displacement of point C, in mm.ANSWERS: (1) 6 mm, (2) 1.186 mm, (3) 1.337 mm--
Chapter 8 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 8 - Discuss the terms plastics and polymers. In...Ch. 8 - What are some naturally occurring nonmetallic...Ch. 8 - What are some material families that would be...Ch. 8 - How might plastics be defined from the viewpoints...Ch. 8 - What is the primary type of atomic bonding within...Ch. 8 - What is the difference between a saturated and an...Ch. 8 - What is an isomer?Ch. 8 - Describe and differentiate the two means of...Ch. 8 - What is a mer?Ch. 8 - What is degree of polymerization?
Ch. 8 - How does increasing the chain length tend to...Ch. 8 - In what way are copolymers similar to alloys in...Ch. 8 - Describe and differentiate thermoplastic and...Ch. 8 - Describe the mechanism by which thermoplastic...Ch. 8 - What does it mean when a polymer crystallizes? How...Ch. 8 - What are some of the ways that a thermoplastic...Ch. 8 - What are the four most common thermoplastic...Ch. 8 - Why are thermosetting polymers characteristically...Ch. 8 - How do thermosetting polymers respond to...Ch. 8 - Describe how thermoplastic or thermosetting...Ch. 8 - What are some attractive engineering properties of...Ch. 8 - What are some limiting properties of plastics, and...Ch. 8 - What are some environmental conditions that might...Ch. 8 - What is the most common polymer (accounting for...Ch. 8 - What are some reasons that additive agents are...Ch. 8 - What are some functions of a filler material in a...Ch. 8 - What are some of the more common filler materials...Ch. 8 - What is the function of a plasticizer?Ch. 8 - What is the difference between a dye and a...Ch. 8 - What is the role of a stabilizer or antioxidant?Ch. 8 - How might electrical conductivity be imparted to a...Ch. 8 - What is an oriented plastic, and what is the...Ch. 8 - What are some properties and characteristics of...Ch. 8 - Describe the use of plastic materials as...Ch. 8 - What are some potential benefits of using plastics...Ch. 8 - Describe some of the applications for foamed...Ch. 8 - Provide some examples where plastics have competed...Ch. 8 - What are some features of plastics that make them...Ch. 8 - In a cost comparison, why might cost per unit...Ch. 8 - How has the use of plastics grown in the...Ch. 8 - What kinds of plastics are most easily recycled?Ch. 8 - Why is the recycling of mixed plastics more...Ch. 8 - What are some recycling alternatives for...Ch. 8 - What are some of the natural materials used to...Ch. 8 - What are some of the approaches to producing a...Ch. 8 - What is the unique mechanical property of...Ch. 8 - How can cross�linking be used to control the...Ch. 8 - What is the cause of stress relaxation in...Ch. 8 - What are some of the materials that can be added...Ch. 8 - What are some of the limitations of natural...Ch. 8 - What are some of the common artificial elastomers?Ch. 8 - Prob. 52RQCh. 8 - Prob. 53RQCh. 8 - Prob. 54RQCh. 8 - Prob. 55RQCh. 8 - Prob. 56RQCh. 8 - Prob. 57RQCh. 8 - Prob. 58RQCh. 8 - Prob. 59RQCh. 8 - What kinds of ceramic products are classified as...Ch. 8 - Prob. 61RQCh. 8 - Prob. 62RQCh. 8 - Prob. 63RQCh. 8 - What is the unique feature of piezoelectric...Ch. 8 - Prob. 65RQCh. 8 - Prob. 66RQCh. 8 - Prob. 67RQCh. 8 - What are cermets, and what properties or...Ch. 8 - What are some of the attractive features of a...Ch. 8 - Prob. 70RQCh. 8 - Prob. 71RQCh. 8 - Prob. 72RQCh. 8 - Prob. 73RQCh. 8 - Prob. 74RQCh. 8 - Prob. 75RQCh. 8 - Prob. 76RQCh. 8 - Prob. 77RQCh. 8 - What is a composite material?Ch. 8 - What are the basic features of a composite...Ch. 8 - Prob. 80RQCh. 8 - Prob. 81RQCh. 8 - Prob. 82RQCh. 8 - What are some reasons for creating clad...Ch. 8 - Prob. 84RQCh. 8 - Prob. 85RQCh. 8 - Prob. 86RQCh. 8 - Prob. 87RQCh. 8 - Prob. 88RQCh. 8 - Prob. 89RQCh. 8 - Prob. 90RQCh. 8 - Prob. 91RQCh. 8 - What is the most common matrix material used in...Ch. 8 - Prob. 93RQCh. 8 - What are the attractive features of a...Ch. 8 - Prob. 95RQCh. 8 - Prob. 96RQCh. 8 - Prob. 97RQCh. 8 - Prob. 98RQCh. 8 - Prob. 99RQCh. 8 - Prob. 100RQCh. 8 - Prob. 101RQCh. 8 - Prob. 102RQCh. 8 - What are some of the limitations that might...Ch. 8 - Prob. 104RQCh. 8 - Prob. 105RQCh. 8 - Prob. 1PCh. 8 - Many of the materials presented in this chapter...Ch. 8 - Prob. 4PCh. 8 - Prob. 5PCh. 8 - Prob. 6PCh. 8 - Prob. 7PCh. 8 - Locate a current or recent article describing an...Ch. 8 - The array of medical devices spans a wide range of...Ch. 8 - Use the Internet and other sources to research...Ch. 8 - Prob. 2CSCh. 8 - The US Army helmet has evolved from sheet steel,...Ch. 8 - Prob. 4CS
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