Aluminum alloy 2024-T3 (T3 temper designation) is reported to have an elastic modulus of 72.4 GPa, yield strength of 345 MPa, and Poisson's ratio of 0.33 [Appendix B, 10e, eText]. Consider a specimen of this alloy with a width of 20 mm (square cross-section) and a gauge/initial length of 150 mm that is deformed in tension to a load of 40,000 N, assuming purely elastic deformation. a) Given the specified information, indicate whether it is reasonable to assume a purely elastic deformation, and briefly explain why or why not. b) Calculate the expected change in cross-sectional area (in mm²), AA (A40kN – Ao).

The lower yield point for a certain plain carbon steelbar is found to be 135 MPa, while a second bar of the samecomposition yields at 260 MPa. Metallographic analysisshows that the average grain diameter is 50μm in the firstbar and 8μm in the second bar.a. Predict the grain diameter needed to cause a loweryield point of 205 MPa.b. If the steel could be fabricated to form a stablegrain structure of 500 nm grains, what strengthwould be predicted?c. Why might you expect the upper yield point to bemore alike in the first two bars than the lower yieldpoint?

Question 1 You are working on a design team at a small orthopaedic firm. You have been asked to select a cobalt- chrome-molybdenum (CoCr) material that will not experience plastic deformation under a specific mechanical test, as follows... A tensile stress is applied along the long axis of a solid cylindrical rod that has a diameter of 10 mm. An applied load of some magnitude F produces a 7x10³ mm change in diameter (see figure below, original shape is blue, elongated shape is unshaded). Q1F: How would the "new alloy" material (with different properties as shown below) behave, assuming it has the same initial diameter (10mm) and applied load (F) in the tensile test? That is, would it experience plastic deformation (yield) under the conditions of this problem?

An uncold-worked brass specimen of average grain size 0.006 mm has a yield strength of 178 MPa. Estimate the yield strength of this alloy (in MPa) after it has been heated to 600°C for 1000 s, if it is known that the value of ky is 11 MPa-mm1/2. The Animated Figure 7.25 may be helpful. Attached is the question and the figure referenced.

3. An uncold-worked brass specimen of average grain size 0.01 mm has a yield strength of 150 MPa (21,750 psi). Estimate the yield strength of this alloy after it has been heated to 500°C for 1000 s, if it is known that the value of σo is 25 MPa. (Note that the axis has logarithmic scale). Grain diameter (mm) (Logarithmic scale) 1.0 0.1 0.01 1 10 850°C 800°C 700°C 102 Time (min) (Logarithmic scale) 600°C 500°C 103 104

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 9

Case Study Calculate the Tensile Toughness Tensile toughness measures the total energy absorbed prior to fracture and is different from fracture toughness and impact toughness. Fracture toughness measures the resistance to fracture when a flaw (i.e. crack) is present in the material. Since it is nearly impossible and costly to manufacture materials with zero or near zero defects, fracture toughness is a major consideration for all structural materials. Impact toughness measures a materials ability to withstand an impact blow (i.e. high strain rates) and is particularly important in assessing the ductile-to-brittle transition behavior (more details later). Impact toughness is also commonly referred to as notch toughness. The tensile toughness can be estimated using the stress-strain curve by measuring the area under the curve (both the elastic and plastic regions). Tensile Toughness = f Stress, σ Ty- Ey Efracture ETS Ur Ey Efracture o de = U₁ + SETS o de + Sefracture o de Ey Ey o de =…

Calculate the ductility of this steel alloy in %EL.

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 %EL

The yield strength for an alloy that has an average grain diameter of 5.3 x 10 146 MPa. At a grain diameter of 7.8 × 10-3 mm, the yield strength increases to 249 MPa. At what grain diameter, in mm, will the yield strength be 236 MPa? d = Ex 0.0022 mm Check Try again 1