1) 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 havethe same value as the yield strength?4) Chapter 3: Review question 3.11: What is the complicating factor that occurs in a compressiontest that might be considered analogous to necking in a tensile test?

Answered: Image /qna-images/answer/6922c8a0-40e1-4015-9f70-059ef05300eb.jpg

Answered: 1) Chapter 2: How do grain boundaries…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A sheet of aluminium alloy is reduced in thickness by 25% following a rolling operation. Tensile test specimens were cut from the sheet before and after rolling. Sketch the tensile test curves for both specimens, making reference to the differences if any, in Young’s modulus, the elastic limit and the level of ductility
Whereas, if the coldworked radius is twenty mm, now what is the radius before being deformed if the ductility percent EL of a coldworked element Cu cylidrical specimen is twenty-five percent?
What is a consequence of strain hardening?
The tensile strength for cold-rolled magnesium alloy AZ31B plate is approximately 160 MPa for specimens tested either parallel or perpendicular to the rolling direction. When similarly oriented specimens are compressed, the yield strength is only 90 MPa. Why? (Hint: Consider the possible deformation mechanisms available in the magnesium alloy and any crystallographic texture that might exist in the wrought plate.)
A copper plate was cold rolled and according to metallographic examination "elongated grains" were not seen in rolling direction. How can you explain this
A low-carbon steel alloy was loaded in tension until just after yielding took place. A few Luders bands were visible on the surface. The bar can either be reloaded (a) immediately, (b) after a brief and moderate temperature aging treatment, or (c) after several weeks without any exposure to elevated temperature. In each of the three cases, how is the yield strength of the reloaded bar likely to compare to that of the original test?
Briefly describe the metallographic procedure. Briefly explain the ASTM grain-size standard. Draw a stress-strain curve for a ductile metal and mention plastic region and 5 important parameters (or points) in your curve. Additionally, explain these parameters (if necessary provide the corresponding equations). Briefly describe the necessities of a compression test for some materials. Explain the reason that buckling happens during the compression test. Explain the Izod impact test. Explain the Brinell hardness test. Explain the creep test. Design and explain fatigue test setup for a crankshaft. Explain the salt spray test in corrosion tests
In the flow curve for pure aluminum, the strength coefficient = 175 MPa and strain-hardening exponent = 0.20. In a forming operation, the final true strain = 0.75. Determine a) the flow stress and b) average flow stress that the metal experienced.
Consider 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?
in tensile test data, show step by step how to find stress and strain in aluminium
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)
We wish to produce a 0.3 inch thick plate of 3105 aluminum having a tensile strength of at least 25,000 psi and an elongation of at least 5%. The original thickness of the plate is 3 inches. The maximum cold work in each step is 85%. Which of the following procedures would achieve the correct final properties (more than one answer is possible!)? Group of answer choices Hot work from 3 in to 0.7 in; cold work from 0.7 in to 0.3 in Cold work from 3 in to 0.7 in; do an anneal to recrystallize the material; cold work from 0.7 in to 0.3 in Cold work from 3 inches to 0.3 inches Cold work from 3 in to 0.7 in; cold work from 0.7 to 0.5 in; do an anneal to recrystallize the material; cold work from 0.5 in to 0.3 in Hot work from 3 in to 0.5 in; do an anneal to recrystallize the material; hot work from 0.5 to 0.3 in Hot work from 3 in to 0.7 in; do an anneal to recrystallize the material; hot work from 0.7 to 0.3 in Cold work from 3 in to 0.5 in; do an anneal to recrystallize the…

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