A Cu-30% Zn brass plate, originally 1.20 inches thick, is desired to have a yield strength greater than 50,000psi and a percent elongation of at least 15%. The final geometry of the plate will be obtained by means ofcold work. What range of final thicknesses is possible to obtain under the given conditions? The effect ofpercent cold work on Cu-3096 Zn brass properties is shown below.10080Resistencia a la tensión (ksi)60Límite elástico (ksi)20Porcentaje de elongación2040 6080Porcentaje de trabajo en fríoPropiedad

Answered: Image /qna-images/answer/108330c2-991e-48c6-88d0-3cd47098ef2d.jpg

Answered: A Cu-30% Zn brass plate, originally…

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 cylindrical brass rod with a minimum tensile strength of 450 MPa, a ductility of at least 13% EL (elongation), and a final diameter of 12.7mm is required. You have in your inventory some 19.0mm diameter brass stock that has been cold worked to 35%. Assuming that the cross section of the rod is still circular after being cold worked, and that brass experiences cracking at 65% CW, describe the necessary working steps in order to achieve the final product. Take the expression for % cold work to be = (Ao - Af)/ Ao x 100%, where Ao and Af are the original and final circular cross-sectional areas of the rod.
A compression test is performed on a 2” diameter by 5” long bar of an unknown metal. At the end of the compression test, the bar has a height of 3.5 inches. The strength coefficient (K) and the work hardening coefficient (n ) are 250 MPa and 0.4, respectively. State all assumptions needed to work the problem. a) Calculate the final diameter of the bar in inches. b) Calculate the flow stress in MPa when the length of the bar is 4”.
(a) A 20 cm long bar (10 mm by 10 mm cross-section) of pure aluminium (Young's modulus = 70 GPa) is subjected to tensile loading. If the bar yields at a load of 14,000 N, what is the maximum elongation at the onset of permanent deformation?(b) For the same bar, if the engineering strains are 0.05 and 0.10 at engineering stresses of 200 and 220 MPa respectively, what would be the work hardening exponent of pure aluminium?
When is Strain hardening used? How is it performed?
A hardness of 45 Rc is required for a plain carbon steel containing 0.6% carbon. Can you explain step by step the work to be done?
What two general competing processes control the creep rate of a metal? What is the relative strength (or rate) of the two processes during Stage I and Stage II creep behavior?
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…
Cold forming method is applied to many metals and alloys such as steel, aluminum, copper at room temperature and temperatures below it, its strength increases after cold. Explain the factor that causes increased material strength.
Explain the effect of annealing to cold worked metal when the heating is done in range of recovery, recrystallization and grain growth stage.
What is a consequence of strain hardening?
A batch of casted mild steel has a modulus of elasticity of 200 GPa and a yield strength of 250MPa. Calculate for its modulus of resilience. After cold working the steel, the yield strength increases to 310 MPa. Calculate for the percent reduction in the average grain diameter given σo =70 MPa and k = 0.74.
To manufacture a piston with a circular cross section, an alloy steel bar is required whose length is fixed and has a value of 35 cm and must withstand a compression load of 5.2 tons. For its design, a safety factor of 4/5 is suggested with respect to the yield stress. The shear modulus for that alloy is 80 GPa.To know the resistance of this steel alloy, a compression test was carried out on a specimen of the same material, from this test the data table of stress against engineering deformation shown was obtained. Image 1 1) Calculate the increase in the diameter of the bar when the load is applied2) Define the Poisson's ratio and calculate its value

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