Question Five (5)In an experiment to determine mechanical properties of a material, samples from the materialwere subjected to a tensile force. In the process, deformations were closely monitored from thebeginning of the experiment to the point when the sample failed. The observed deformations3| PageScanned with CamScannerwere analysed and were as presented in Figure 5.1 below. Based on this figure, answer thefollowing questionsa) Using a well labelled sketch, explainwhat stress and strain are, and giverespective SI unitsb) State the material properties obtainedfrom the points labelledA, B, C and Don Figure 5.1c) Given results similar to Figure 5.1,explain how you would determine amaterial's property labelled B.d) Given results similar to Figure 5.1,explain how you would determine amaterial's Young's modulus.e) What measurements would you take ifyou were to determine a materials'Poisson's ratio.DBStrain (%)Figure 5.1:Tensile stress-strain behaviour ofa materialsStress (MPa)

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Answered: were analysed and were as presented in…

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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Consider the graph below for 3 test samples A, B and C of the same metal composition which have been cold-worked, but to different extents. If you had to sort the samples by the degree of cold-working they have undergone, how would you rank them? Stress (MPa) 600 500 400 300 200 100 05 0 Select one: O a. A
Question One a) In a tensile test, material mechanical properties are determined by relating deformations to the applied forces. i. Sketch a typical specimen used in such tests and on it indicate two important dimensions i Sketch the difference you would cxpect in tensile and compressive deformations Sketch a stress-strain curve/graph you would expect from such a test and on it indicate how you would obtain (1) Young's modulus, E(2) clastic limit,oei(3) yield strength ay and (4) ultimate tensile strength duTS ii. b) In such a test, as the one in (a) above, a specimen manufactured from steel, and had an original diameter of 12.8 mm and gauge length of 50.8 mm. The resulting data, stress and strain, is listed in the table below. Strain 0.007 0018 0.032 005 0 052 0.056 0.06 0.005 0072 0.076 011 0.15 017 022 024 (m/ m) Stress 80.8 218 390 540 600 630. 650 640 634 643 745 851 885 815 770 (MPa) By plotting stresses on the vertical axis and strains on the horizontal axis, plot a stress-strain…
Consider the graph below for 3 test samples A, B and C of the same metal composition which have been cold-worked, but to different extents. If you had to sort the samples by the degree of cold-working they have undergone, how would you rank them? Stress (MPa) 600 500 400 300 200 100 Select one: A B 0.05 0.1 a. C
1. A tensile test was conducted on a metal "505" specimen and the following stress-strain curves were generated, both curves generated from the same set of data. Use the graphs to fill in the mechanical properties of the material tested in the box below. Don't forget units! Stress vs Strain Stress, psi Stress, psi 80000 70000 60000 50000 40000 30000 20000 10000 0 0.00 80000 70000 60000 50000 40000 30000 20000 10000 0.02 0 0.000 0.002 0.04 0.004 0.06 0.006 0.08 0.10 Strain Stress vs Strain 0.008 0.12 Elastic Modulus, E: 0.2% Offset Yield Strength, oo: Tensile Strength, ou: Breaking Strength, of: % Elongation: 0.14 0.010 0.012 0.014 Strain 0.16 0.18 0.016 0.018 0.20 0.020
In the First project: you have been asked to perform tensile testing for four different materialsand analyse the results and work on some NDT process selection:a. For the results shown in Table 1 of the tensile testing that you have performed, find thefollowing, if you know that the original length of specimen is 20.8 mm and the original diameteris 6.4 mm. Fill the calculated results in the summary table below (Table 1):1. Plot the engineering stress versus engineering strain for each material and L-D Diagram.2. Compute the modulus of elasticity, E in GPa.3. Determine the yield strength at a strain offset of 0.002.4. Determine the tensile strength in MPa.5. What is the approximate %El ductility, measured by percent elongation?6. Compute the modulus of resilience.7. Determine the fracture stress in MPa.8. Compute the final area (Af) in mm2.
3. Two specimens with the same dimensions and made from two different materials, A and B, were subjected to tensile testing. The percentage reduction in the area of the specimen made of material 'A' was calculated 3 times that of the specimen made of material B. In this case, O A lthe ductility of material A and B is equal O Bthe material A is brittle and material B is ductile O Cthe material B is more ductile than material A O D nhe material A is more ductile than material B 1. 20 O Aramak için buraya yazıin
At higher temperature, strength and strain hardening are increased, whereas, ductility is decreased which permits greater plastic deformation True False O Saaly i The strength constant (C) is increased with increasing of temperature True O False O The metal is becoming weaker as strain increases, this is because of .strain hardening (work hardening) property True O False O ly The engineering stress and strain are defined relative to the instantaneous area and length of test specimen True O False O In sheetmetal working processes, the surface area-to-volume ratio of .w.p. is low True O False O aly ihi Determine the value of the strain-hardening exponent for a metal that will cause the average flow stress to be 70% of the final flow stress after deformation 0.444 0.421 0.422 0.428 aaly i For pure copper (annealed), the strength coefficient = 330 MPa and strain-hardening exponent = 0.52 in the flow curve equation. Determine the average flow stress that the metal experiences if it is…
Figure 1 shows the tensile testing results for different materials. All specimens have an initial diameter of 12 mm and an initial gauge length of 50 mm. 300 250 Low carbon steel Network polymer 200 Crystalline polymer 150 Amorphous polymer 100 50 5 10 15 20 25 30 Strain (%) Figure 1: Stress-strain curve b. Determine the following parameters for each material: • the tensile strength the 0.2% offset yield strength the modulus of elasticity • the ductility Stress (MPa) LO
You have been asked to obtain an object/structure/component that has failed (It may come fromyour home, workshop, an automobile repair shop, a machine shop, and so on) and investigate to:1. Determine the cause and type of failure (i.e., simple fracture, fatigue, creep).2. What are the working and environmental conditions that causes the failure?3. Propose measures that can be taken to prevent future incidents of this type of failure.4. After you have determined the failure type of your case study, your leader asked you to writeshortly about the other mechanisms of failures.
The graph below shows the yield stress for a polycrystalline metal as a function of the grain size of the metal. The point A is (10 microns, 100 MPa) and B is (1000 microns, 28 MPa). Using this data, calculate what is the closest numerical match to the yield stress at 2 microns. yield stress (MPa) 8 8 8 8 8 8 8 80 70 50 40 30 A 200 Select one: O a. 198.9 MPa O b. 310.9 MPa O C. O d. 80.5 MPa 252.6 MPa O e. 165.2 MPa 400 600 grain size d (microns) 800 B ● 1000
At higher temperature, strength and strain hardening are increased, whereas, ductility is decreased which permits greater plastic .deformation True O False O .The strength constant (C) is increased with increasing of temperature True O False O The metal is becoming weaker as strain increases, this is because of .strain hardening (work hardening) property نقطة واحدة True O False O The engineering stress and strain are defined relative to the .instantaneous area and length of test specimen True O False aaly ihi In sheetmetal working processes, the surface area-to-volume ratio of .w.p. is low True O False ialy ihii Determine the value of the strain-hardening exponent for a metal that will cause the average flow stress to be 70% of the final flow stress after .deformation 0.444 0.421 0.422 0.428 aals i For pure copper (annealed), the strength coefficient = 330 MPa and strain-hardening exponent = 0.52 in the flow curve equation. Determine the average flow stress that the metal experiences…
Flag question You have been given the following test sample data following mechanical testing of 15 test pieces of a modified Alumina. What is the Weibull modulus of this material? Would you advise the use of this material over one with a Weibull Modulus of 19.6 and a mean failure stress of 270 MPa, if you anticipate that the peak stress on the material could be 255 MPa? Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Select one or more: Failure Stress (MPa) 297 293 270 300 260 286 265 295 4 293 280 288 263 290 298 275

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