Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 6, Problem 21QLP
If aircraft, such as a Boeing 757, are made of 79% aluminum, why are automobiles made predominantly of steel?
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Chapter 6 Solutions
Manufacturing Engineering & Technology
Ch. 6 - Given the abundance of aluminum in the Earths...Ch. 6 - Prob. 2RQCh. 6 - What are the major uses of copper? What arc the...Ch. 6 - What are superalloys? Why are they so named?Ch. 6 - What properties of titanium make it attractive for...Ch. 6 - Which properties of each of the major refractory...Ch. 6 - Prob. 7RQCh. 6 - What it the composition of (a) babbitts, (b)...Ch. 6 - Name the materials described in this chapter that...Ch. 6 - What are the major uses of gold and silver, other...
Ch. 6 - Describe the advantages to using zinc as a coating...Ch. 6 - Prob. 12RQCh. 6 - Why are aircraft fuselages made of aluminum...Ch. 6 - How is metal foam produced?Ch. 6 - What metals have the lowest melting points? What...Ch. 6 - Explain why cooking utensils generally are made of...Ch. 6 - Would it be advantageous to plot the data in Table...Ch. 6 - Compare the contents of Table 6.3 with those in...Ch. 6 - What factors other than mechanical strength should...Ch. 6 - Prob. 20QLPCh. 6 - If aircraft, such as a Boeing 757, are made of 79%...Ch. 6 - Prob. 22QLPCh. 6 - Most household wiring is made of copper wire. By...Ch. 6 - The example in this chapter showed the benefits of...Ch. 6 - If tungsten is the highest melting-point metal,...Ch. 6 - A simply supported rectangular beam is 25 mm wide...Ch. 6 - Obtain a few aluminum beverage cans, cut them, and...Ch. 6 - Beverage cans usually are stacked on top of each...Ch. 6 - Using strength and density data, determine the...Ch. 6 - Plot the following for the materials described in...Ch. 6 - Prob. 33SDPCh. 6 - Give some applications for (a) amorphous metals,...Ch. 6 - Describe the advantages of making products with...Ch. 6 - In the text, magnesium was described as the...Ch. 6 - Prob. 38SDPCh. 6 - Review the technical literature, and write a...
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- Discuss the Production process of Aluminum in detail.arrow_forwardReplacing about half of the steel-based materials in a car can reduce the weight of the car by almost 60%. This can lead to nearly a 30% increase in fuel efficiency. What kinds of materials could replace steel in cars? What would be the advantages and disadvantages in using these materials?arrow_forwardExplain how the properties and structure of different given engineering materials affect their behaviour in given engineering applications 1) Machinery such as farm equipment and packaging machines uses shear pins made from high carbon steel to prevent overload if something becomes jammed. Explain the reasons for choosing this material. 2) Titanium alloy (code Ti-6Al-2Sn-4Zr-6Mo) is widely used for aircraft engine components and chemical plant equipment. Explain why it performs well in conditions of high stress and high temperature. For each answer you must explain how the properties and structure of the material affect its performance. - include diagrams if appropriatearrow_forward
- Give some examples of Ductile materials?arrow_forwardAn application requires the support of an axial load of 100 kips with a round rod without exceeding the yield strength of the material. Assume the current cost per pound for round stock is given in the table below for several materials that are being considered. Material properties are available in Tables A-5, A-20, A-21, and A-24. Select one of the materials for each of the following additional design goals. (a) Minimize diameter. (b) Minimize weight. (c) Minimize cost. (d) Minimize axial deflection. Material 1020 HR 1020 CD 1040 Q&T @800°F 4140 Q&T @800°F Wrought Al 2024 T3 Titanium alloy (Ti-6Al-4V) Cost/lbf $0.27 $0.30 $0.35 $0.80 $1.10 $7.00 Page 90arrow_forwardIs the effect of temperature on all materials the same? Yes or no.arrow_forward
- An engineer is making determinations on the best alloy of steel to use in cables for a cable-stayed bridge. The investigator’s tool is a tensile testing instrument which can measure the strength of the alloys by slowly increasing the load on the cable to the point where the cable breaks and breaking point value (amount of weight on the cable when it fails) can be accurately measured. The investigator also is interested in determining the amount of deformation of the cable (how much it stretches under load conditions which is also very important in structural considerations. The tests must be uniform and consistent to give the precision needed to make valid conclusions about the best alloy for the cables. On the line after the item, identify which type of variable it represents from (a) independent variable, (b) dependent variable, (c) control variable. 1) thickness of the cable _____________ 5) length of the cable _____________ 2) testing room temperature…arrow_forwardOn engineering materials, which has longer life, short belt or long belt? And why?arrow_forwardA cylindrical rod 500 mm long, having a diameter of 12.7 mm, is to be subjected to a tensile load. If the rod is to experience neither plastic deformation nor an elongation of more than 1.3 mm when the applied load is 29,000 N, which of the four metals or alloys listed below are possible candidates? Justify your choice(s).Material Modulus of Elasticity (GPa ) Yield Strength (MPa) Tensile Strength (MPa)Aluminum alloy 70 225 420Brass alloy 100 325 420Copper 110 210 275Steel alloy 207 450 550arrow_forward
- What should be the basis in comparing the strength of two different materials? The applied load or working stress? Explain.arrow_forwardIn the realm of mechanical engineering, how do advances in material science, especially in the development of superalloys and composite materials, impact the design and efficiency of high-performance machinery, particularly in aerospace and automotive applications?arrow_forwardTable Q1 consists of 4 (four) materials with their mechanical properties. The length of a cylindrical rod 380 mm long, having a diameter of 10.0 mm, is to be subjected to a tensile load of 24,500 N. (a) Calculate the stress of the cylindrical rod. (b) Compare with data given in Table Q1 which are the likely materials for the cylindrical rod if it does not experience plastic deformation? Justify. (c) What is the likely material if the elongation is less than 0.9 materials? Justify. Table Q1 Modulus of Elasticity, Yield Strength and Tensile Strength Material Modulus of Yield Tensile Strength Strength Elasticity (GPa) (MPa) (MPa) Aluminum 70 255 420 alloy Brass alloy 100 345 420 Copper 110 250 290 Steel alloy 207 450 550arrow_forward
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