Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 4, Problem 33QTP
(a)
To determine
Determine the time that it would take for 1080 steel to soften to
(b)
To determine
Determine the time that it would take for 1080 steel to soften to
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Q3 contd.
(d) The yield strength values of pure aluminium (Al) and pure copper (Cu) are 25 MPa and 20
MPa, respectively; whereas the yield strength values of cold rolled Al-Mn-Mg alloy and cast
60-40 Brass (60% Cu, 40% Zn) are 200 MPa and 105 MPa, respectively. With aid of
schematics, explain the main mechanisms account for the increases in the strengths.
(e) A cylindrical tie rod with a diameter of 18.4 mm is subjected to cyclic loading. The stress range
is +/- 200 kN. Figure Q3.3 shows the S-N curve of the material of which the rod is made, how
many cycles will this rod survive?
Stress amplitude
O₂ (MPa)
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
10²
10³
104
4340 low-alloy steel
Stress ratio = -1
Fig. Q3.3
105
106
Number of cycles to failure, Nf
107
108
Describe Castigliano’s Second Theorem?
part made from AISI 1212 steel undergoes a 20 percent cold-work operation.
(a) Obtain the yield strength and ultimate strength before and after the cold-work operation. Determine
the percent increase in each strength.
(b) Determine the ratios of ultimate strength to yield strength before and after the cold work operation.
What does the result indicate about the change of ductility of the part?
Chapter 4 Solutions
Manufacturing Engineering & Technology
Ch. 4 - Describe the difference between a solute and a...Ch. 4 - What is a solid solution?Ch. 4 - Prob. 3RQCh. 4 - Describe the difference between a single-phase and...Ch. 4 - What is an induction heater? What kind of part...Ch. 4 - Describe the major features of a phase diagram.Ch. 4 - What do the terms equilibrium and constitutional,...Ch. 4 - Prob. 8RQCh. 4 - What is tempering? Why is it performed?Ch. 4 - Explain what is meant by severity of quenching.
Ch. 4 - What are precipitates? Why are they significant in...Ch. 4 - Prob. 12RQCh. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Prob. 15RQCh. 4 - You may have seen some technical literature on...Ch. 4 - Prob. 17QLPCh. 4 - What is the difference between hardness and...Ch. 4 - Prob. 19QLPCh. 4 - Prob. 20QLPCh. 4 - Prob. 21QLPCh. 4 - Describe the characteristics of (a) an alloy, (b)...Ch. 4 - Explain why carbon, among all elements, is so...Ch. 4 - Prob. 24QLPCh. 4 - In Section 4.8.2, several fluids are listed in...Ch. 4 - Why is it important to know the characteristics of...Ch. 4 - Explain why, in the abscissa of Fig. 4.16c, the...Ch. 4 - Prob. 28QLPCh. 4 - Prob. 29QLPCh. 4 - Prob. 30QLPCh. 4 - Design a heat-treating cycle for carbon steel,...Ch. 4 - Using Fig. 4.4, estimate the following quantities...Ch. 4 - Prob. 33QTPCh. 4 - Prob. 34QTPCh. 4 - Prob. 35SDPCh. 4 - Figure 4.18b shows hardness distributions in...Ch. 4 - Throughout this chapter, you have seen specific...Ch. 4 - Refer to Fig. 4.24, and think of a variety of...Ch. 4 - Inspect various parts in your car or home, and...
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- A 20 foot long x 4 feet wide x ½ inch thick sheet of an aluminum alloy is cold rolled to a thickness of ¼ inch. During the rolling operation the with of the sheet increases by 10%. The strength coefficient (K) and the strain hardening coefficient (n ) for the aluminum alloy are 25,500 psi and 0.3, respectively. Calculate the length of the sheet after the rolling operation in feet.arrow_forwardA 10-mm-diameter Brinell hardness indenter produced an indentation of 1.52 mm in diameter in a steel alloy when a load of 500 kg was used. (a) Compute the HB of this material. (b) What will be the diameter of an indentation to yield a hardness of 400 HB when a 500-kg load is used?arrow_forwardA part made from hot-rolled AISI 1212 steel undergoes a certain amount of cold-work operation. If the ultimate strength of the material after cold work operation was 80 kpsi. (a) Determine the percentage of cold work (b) Obtain the yield strength after the cold work (c) Determine the hardness of the material before and after the cold work operationarrow_forward
- 1. Cold working is done in ambient temperature while hot working is done at around 600°C for steel. Differentiate the effect of the two process in steel, and the reason for using one from the other.arrow_forwardName the material's strengthening mechanism behind each of the following phenomena: (1) Si alloyed aluminum alloy has a higher strength than pure aluminum metal. (2) A steel gains extra strength after cold rolling. Blank # 1 Blank # 2arrow_forwardCan you please simplify the solution for this problem. Kindly clarify also if I am wrong I think our prof forgot to put the cos(10) for the distance of the restultant. (For the solution below)arrow_forward
- An application requires ultimate tensile strength and yield strength ofa steel at 110 ksi and 91 ksi, respectively. Answer the following 4 questions: Can SAE 1040 steel be selected for this application? If “no” is the answer in Part I, the following Part II, III, and IV can beignored. If “yes” is the answer in Part I, which condition of SAE 1040 shouldbe selected? Why is that steel with the condition in part II selected? Is the selected steel brittle or ductile? and Why?arrow_forwardA mild steel specimen is given to you which has a tensile strength of 40MPA and your main objective is to increase its strength. What type of heat treatment would you recommend? Justify your answer with proper reasoning.arrow_forwardWhen a 3000 kg load is applied to a 10-mm-diameter ball in a Brinell test of a steel,an indentation of 3.1 mm diameter is produced.Estimate the tensile strength of the steel?arrow_forward
- Suppose a 24 in. long round bar is to support a load of 400 lb. without any permanent deformation. Calculate the minium diameter of the bar if it is made of (a) AZ0A-T5 magnesium alloy and (b) 6061-T6 aluminum alloy. Calculate the wieght of the bar and the approximate cost based on pure Al and Mg in each case.arrow_forwardA 2.0-inch diameter 4140 steel bar is austenized and tempered in oil without Agitation, determine the resulting hardness at 0.6 inches below the surface, present all the Procedure to arrive at the answer (include sketch of the piece and graph used with steps Using word forms)arrow_forwardPlease elaborate the following: Typical stress-strain characteristics of steel in simple tension and the evaluation of its mechanical properties .arrow_forward
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