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 9RQ
Why should caution be exercised when applying the results from any of the standard
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Students have asked these similar questions
Hardness tests are performed more frequently
than any other mechanical test for several
reasons: (Choose all that apply):
Other mechanical properties can be
estimated from hardness data such as
tensile strength
The test is simple and inexpensive
The test is nondestructive, which means that
the specimen is neither fractured or
excessively deformed after the test
Testing apparatus is relatively expensive
(one or more option can be true please select from below)
which of the following will reduce the failure strength or lifetime of a test piece and why?
Decreasing the grain size, more grain boundaries to initiate failure
Raising the temperature above the BDTT, more plastic deformation in the lattice will cause it to fail faster
Increasing its volume, greater likelihood of critical defects
Decreasing the loading frequency, the material will be at peak stress values for longer
Increasing the difference between the maximum and minimum stress values, as this affects the stress concentration factor
What are the main features of the Rockwell Hardness Test?
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 are the common types of strength measurements?arrow_forwardGiven your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a test piece or component and why? a. Polishing to reduce surface defects b. Decreasing the temperature below the brittle-ductile transition temperature, to make it harder C. Increasing its volume, to give a larger cross sectional area d. Increasing the grain size so there are less grain boundaries to initiate failure e. Decreasing the difference between the maximum and minimum stress values, as this effects the stress concentration factorarrow_forwardWhat exactly is stress testing, and how does it help?arrow_forward
- What is true stress and true strain?arrow_forward2a: How a material can be mechanically strengthened by designing the grain size after thermomechanical treatments? 2b: How can the extent of cold work be defined? 2c: Specimen A (1008 steel) has an ASTM grain size number of 8 and specimen B (1008 steel) has a grain size number of 4. Which specimen will be having larger grains? A or B 2d: How increasing grain size can play role in decreasing the Toughness? 2e: Is EBSD without using specimen stage tilting is possible?arrow_forwardWhat are the different types of Indenters used in Rockwell Hardness Testing?arrow_forward
- at least 3 ways tyarrow_forwardI need the answer as soon as possiblearrow_forwardGiven your understanding of what initiates and controls failure in materials, which of the following will reduce the failure strength or lifetime of a test piece and why? a. (more than one answer is possible for this question. marks will only be awarded for the question if all the correct options are selected (i.e. 'all or nothing' marking scheme). b. LUS C. d. Increasing its volume, greater likelihood of critical defects Decreasing the loading frequency, the material will be at peak stress values for longer Decreasing the grain size, more grain boundaries to initiate failure Increasing the difference between the maximum and minimum stress values, as this affects the stress concentration factor Recent M Raising the temperature above the BDTT, more plastic deformation in the lattice will cause it to fail faster Garrow_forward
- What mechanical property describes the ability of a material to absorb energy when it is deformed elastically and released the energy upon unloading toughness resilience plasticity ultimate tensile strengtharrow_forwardWhat is Residual Stress?arrow_forwardIn what situations would you use a hardess test instead of a Tensile test?arrow_forward
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