Q3. Draw a representative HCF curve for aluminum alloys. Do aluminum alloys exhibit a fatigue limit? How would you define the fatigue limit of aluminum alloys from the curves you have drawn?
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- Compute the elastic modulus for the following metal alloys, whose stress-strain behaviors may be observed in the "Tensile Tests" module of Virtual Materials Science and Engineering (VMSE): (a) titanium, (b) tempered steel, (c) aluminum, and (d) carbon steel. How do these values compare with those presented in Table 6.1 for the same metals? Part 1 a) What is the elastic modulus of titanium in GPa using the data from VMSE? b) What is the elastic modulus of titanium in GPa from Table 6.1? a) E= i GPa b) E= i GPa eTextbook and Media Save for Later Attempts: 0 of 5 used Submit AnswerDraw two schematic graphs using pencil showing a typical stress-strain curve for aluminum. The first graph should show engineering stress vs engineering strain, and the second graph should show true stress vs true strain. Label the showing: (i) elastic modulus (ii) proportional limit (iii) yield stress (iv)yield strain (v) fracture stress (vi) fracture strain on each graph. You may showboth graphs on one plot. Explain the difference between engineering stress and true stress.Using the values found in the previous two questions, use the Hall-Petch equation and the graph below for a 70 Cu-30 Zn cartridge brass to predict the yield strength (in MPa) of this alloy when the average grain diameter is 1.0 x 10³ mm. Enter only the numerical value, do not include the unit. Grain size, d (mm) 10- 10-2 5 x 103 200 150 100 50 4 8. 12 16 d1/2 (mm-1/2) Yield strength (MPa)
- 1. Suppose that you have measured the strain aging kinetics of a high-strength low-alloy (HSLA) steel and obtained the following results: Aging Temperature (°C) Aging Time (min) ΔΥ (MPa) 150 240 40 130 1800 40 Determine (using a mathematical rather than graphical approach) the time necessary to obtain a strengthening increment, AY, of 40 MPa at an ageing temperature of 120°C. State any assumptions made in order to arrive at your approximation.For the aluminum alloy whose stress-strain behavior can be observed in the "Tensile Tests" module of Virtual Materials Science and Engineering (VMSE), determine the following: (a) the approximate yield strength (0.002 strain offset), MPa (b) the tensile strength, and i MPa (c) the approximate ductility, in percent elongation. i %ELFollowing is the Tensile stress-strain data for several hypothetical metals to be used. Answer the following questions referring to table 1.1. Table 1.1: Material Property Data Material Tensile Strength Fracture Strength Strain at Strength (MPa) (MPa) 340 265 550 505 112 150 Fracture before yielding A B C D 0.23 0.15 0.40 a. Which will experience the greatest percent reduction in area? Why? b. Which is the strongest? Why? c. Which is the stiffest? Why? Elastic Modulus (GPa) 210 310 180 400
- Using the graphs in Figures for Q2 (b) & (c), select a metal alloy for an application that requires a tensile strength of at least 370 MPa while maintaining a minimum ductility of 27%. If the metal may be cold worked, decide which of the following is a suitable material; copper, brass or 1040 steel. You need to explain your selection process.As the head of R&D in your company which deals with aluminum, you are faced with aluminum alloy 2014 which was solution heat-treated. The alloy needs to be hardened by precipitation hardening to have a minimum yield strength of 345 MPa and ductility of at least 12% EL. What practical precipitation heat treatment with respect to temperature and time will you recommend to give these mechanical properties? Explain your answer Usc - A Z Type here to search @ 2 W S alt TRINIT # X 3 aps E D $ 4 C R Atomic percentage, magnesium O ene F % 5 T D V G 6 Y B & 7 H U N 8 J 9 11 M K Ľ L P 73 prt sc ? Ľ 1 backspace pause 40) Turn 8:59 AM 9/13/2022 11 enter 7 home A 28. 1 5 end 9The properties of a titanium allow used in commercial airplanes are shown in the table: Strength (MPa) Grain Size (mm) 0.020 162 0.055 148 Determine a) the constants of the Hall-Petch equation and b) the grain size required to obtain a strength of 192 MPa
- (b) Figure 1 shows, the tensile engineering stress-strain curve for an aluminum alloy. Based on Figure 1, determine: (1) Yield strength (a) (ii) Ultimate Tensile Strength (ors) (ii) Young Modulus (E) | Stress vs Strain 350 300 250 200 150 100 50 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 Strain (mm/mm) Figure 1: Engineering stress-strain curve for aluminum alloy Stress (N/mm2)6. The following engineering stress-strain data were obtained for 0.2% C plain carbon steel. (a) Plot the engineering stress-strain curve (b) Determine the ultimate tensile strength for the alloy (c) Determine the percent elongation at fracture (d) Plot the true stress-strain curve Engineering strain, in./in. Engineering stress, ksi 30 0.001 55 0.002 60 0.005 68 0.01 72 0.02 74 0.04 75 0.06 76 0.08 75 0.1 73 0.12 69 0.14 65 0.16 56 0.18 51 0.19(fracture)An engineer is making determinations on the best alloy of steel to use in cables for a cable-stayed bridge. The investigator’s tool is a tensile testing instrument which can measure the strength of the alloys by slowly increasing the load on the cable to the point where the cable breaks and breaking point value (amount of weight on the cable when it fails) can be accurately measured. The investigator also is interested in determining the amount of deformation of the cable (how much it stretches under load conditions which is also very important in structural considerations. The tests must be uniform and consistent to give the precision needed to make valid conclusions about the best alloy for the cables. On the line after the item, identify which type of variable it represents from (a) independent variable, (b) dependent variable, (c) control variable. 1) thickness of the cable _____________ 5) length of the cable _____________ 2) testing room temperature…