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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Textbook Question
Chapter 2, Problem 27RQ
What is strain hardening or work hardening? How might this phenomenon be measured or reported? How might strain hardening be used when manufacturing products?
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Chapter 2 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 2 - Prob. 1RQCh. 2 - Provide two definitions of the termÂ...Ch. 2 - Knowledge of what four aspects and their...Ch. 2 - Give an example of how we might take advantage of...Ch. 2 - What are some of the possible property...Ch. 2 - What are some properties commonly associated with...Ch. 2 - What are some of the more common nonmetallic...Ch. 2 - What are some of the important physical properties...Ch. 2 - Why should caution be exercised when applying the...Ch. 2 - What are the standard units used to report stress...
Ch. 2 - What are static properties?Ch. 2 - What is the most common static test to determine...Ch. 2 - What is engineering stress? Engineering strain?...Ch. 2 - What is Youngs modulus or stiffness, and why might...Ch. 2 - What are some of the tensile test properties that...Ch. 2 - Why is it important to specify the offset when...Ch. 2 - How is the offset yield strength determined?Ch. 2 - During the plastic deformation portion of a...Ch. 2 - What are the test conditions associated with...Ch. 2 - How would the tensile test curves differ for a...Ch. 2 - What are two tensile test properties that can be...Ch. 2 - What is uniform elongation, and when might it be...Ch. 2 - Is a brittle material a weak material? What does...Ch. 2 - What is the toughness of a material, and how might...Ch. 2 - What is the difference between true stress and...Ch. 2 - Explain how the plastic portion of a true...Ch. 2 - What is strain hardening or work hardening? How...Ch. 2 - Give examples of applications utilizing high...Ch. 2 - How might tensile test data be misleading for a...Ch. 2 - What type of tests can be used to determine the...Ch. 2 - What are some of the different material...Ch. 2 - What units could be applied to the Brinell...Ch. 2 - Although the Brinell hardness test is simple and...Ch. 2 - What are the similarities and differences between...Ch. 2 - Why are there different Rockwell hardness scales?Ch. 2 - How might hardness tests be used for quality...Ch. 2 - What are the attractive features of the Vickers...Ch. 2 - When might a microhardness test be preferred over...Ch. 2 - What is the attractive feature of the Knoop...Ch. 2 - Why might the various types of hardness tests fail...Ch. 2 - What is the relationship between penetration...Ch. 2 - Describe several types of dynamic loading.Ch. 2 - Why should the results of standardized dynamic...Ch. 2 - What are the two most common types of bending...Ch. 2 - What aspects or features can significantly alter...Ch. 2 - What is notch�sensitivity, and how might it be...Ch. 2 - Which type of dynamic condition accounts for...Ch. 2 - Are the stresses applied during a fatigue test...Ch. 2 - Is a fatigue S–N curve determined from a...Ch. 2 - What is the endurance limit? What occurs when...Ch. 2 - What features may significantly alter the fatigue...Ch. 2 - What relationship can be used to estimate the...Ch. 2 - Describe the growth of a fatigue crack.Ch. 2 - What material, design, or manufacturing features...Ch. 2 - How might the relative sizes of the fatigue region...Ch. 2 - What are fatigue striations, and why do they form?Ch. 2 - Why is it important for a designer or engineer to...Ch. 2 - What mechanical property changes are typically...Ch. 2 - Prob. 59RQCh. 2 - Prob. 60RQCh. 2 - How might the orientation of a piece of metal...Ch. 2 - How might we evaluate the long�term effect of...Ch. 2 - Prob. 63RQCh. 2 - What is a stress–rupture diagram, and how is one...Ch. 2 - Why are terms such as machinability, formability,...Ch. 2 - Prob. 66RQCh. 2 - What are some of the types of flaws or defects...Ch. 2 - What three principal quantities does fracture...Ch. 2 - What is a dormant flaw? A dynamic flaw? How do...Ch. 2 - How is fracture mechanics applied to fatigue...Ch. 2 - What are the three most common thermal properties...Ch. 2 - Describe an engineering application where the...Ch. 2 - Why is it important that property testing be...Ch. 2 - Why is it important to consider the orientation of...Ch. 2 - Select a product or component for which physical...Ch. 2 - Repeat Problem 1 for a product or component...Ch. 2 - Repeat Problem 1 for a product or component...Ch. 2 - A fuel tanker or railroad tanker car has been...Ch. 2 - One of the important considerations when selecting...Ch. 2 - Several of the property tests described in this...Ch. 2 - Steel and aluminum cans that have been submitted...Ch. 2 - Prob. 2CSCh. 2 - Prob. 3CSCh. 2 - Prob. 4CSCh. 2 - Prob. 5CSCh. 2 - Prob. 6CSCh. 2 - Mixed plastic consisting of recyclable...Ch. 2 - What do you suspect is the cause of these...Ch. 2 - Prob. bCSCh. 2 - Prob. cCS
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- What visual evidence supports the presence of significant grain boundary sliding in many creep failures?arrow_forward: During tensile tests, strain hardening was observed for a metal alloy with a tensile strength of 18,000 psi under regular yielding condition. However, when it was pre-stretched to a 0.5% extension (based on the initial length of the specimen), its strength increased to 20,000 psi. If the pre-extension is increased to 5%, what could be the strength of the material?arrow_forwardDescribe the stress-strain behavior?arrow_forward
- Example: Consider a metal whose strain hardening behavior follows: 25,000 0.25 psi. If an annealed bar of this metal is pulled in a tension test from a starting dia. of 12.7mm to a dia. of 11.5mm (uniform elongation, no friction, no distortion), what is the work per unit volume required? If the bar is reduced by extruding and the deformation efficiency is 70%, what is the extrusion pressure?arrow_forwardpart 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?arrow_forward1) Chapter 2: How do grain boundaries contribute to strain hardening in metals? 2) Chapter 3: Review question 3.6: What is work hardening? 3) Chapter 3: Review question 3.10: Under what circumstances does the strength coefficient have the same value as the yield strength? 4) Chapter 3: Review question 3.11: What is the complicating factor that occurs in a compression test that might be considered analogous to necking in a tensile test?arrow_forward
- 1 You want to produce a Brass plate that is 0.25" thick with a yield stress 50 ksi which corresponds to 37.5% cold work. The initial plate thickness is 1.0". The maximum cold work per step is 60%. What are the cold work and annealing steps that are necessary to achieve the desired result?arrow_forwardIf you have a material that is initially hard and strong, would you expect it to cyclically harden or soften? What would be a way of characterizing how strong it must be initially to make your answer a bit more quantitative?arrow_forwardConsider the tensile stress strain curves in Figure 8-20 labeled 1 and 2 and answer the following questions. These curves are typical of metals. Consider each part as a separate question that has no relationship to previous parts of the question. (a) Which material has the larger work hardening exponent? How do you know? (b) Samples 1 and 2 are identical except that they were tested at different strain rates. Which sample was tested at the higher strain rate? How do you know? (c) Assume that the two stress strain curves represent successive tests of the same sample. The sample was loaded, then unloaded before necking began, and then the sample was reloaded. Which sample represents the first test: 1 or 2? Haw do you know?arrow_forward
- Note: Kindly give me both right answers. A) Did the ductile materials (annealed and aluminium) react differently to the two different testing methods (hardness test vs. tensile test)? What does this say about the behaviour of ductile materials in compression vs. tension? B) Did the brittle material (quenched) react differently to the two different testing methods (hardness test vs. tensile test)? What does this say about the behaviour of brittle materials in compression vs. tension? (Three to five sentence answers are good)(engineering material)arrow_forwardRegarding annealing, choose the right answer (One or more): The actual annealing time must be long enough to allow for any necessary transformation reactions that may occur Annealing can be performed to release internal stresses of the material The main purpose of annealing is to decrease or restore material's ductility Time isn't a significant parameter in annealing process If the rate of temperature change is too great, temperature gradients and internal stresses may be induced that may lead to warping or even crackingarrow_forwardA Cu-30% Zn brass plate, originally 1.20 inches thick, is desired to have a yield strength greater than 50,000 psi and a percent elongation of at least 15%. The final geometry of the plate will be obtained by means of cold work. What range of final thicknesses is possible to obtain under the given conditions? The effect of percent cold work on Cu-3096 Zn brass properties is shown below. 100 80 Resistencia a la tensión (ksi) 60 Límite elástico (ksi) 20 Porcentaje de elongación 20 40 60 80 Porcentaje de trabajo en frío Propiedadarrow_forward
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