In an engineering application, the material is a strip of iron with a fixed crystallographic structure subject to a tensile load during operation. The part failed (yielded) during operation and needs to be replaced with a component with better properties. You are told that two other iron strips had failed at yield stresses of 110 and 120 MPa, with grain sizes of 30 microns and 25 microns respectively. The current strip has a grain size of 20 microns. The diameter of the rod is 1 mm and the load applied is 100 N. What is the yield stress of the new part C and would you recommend it for operation? Select one: O a. 140.5, no O b. 129.5, yes O C. 120.5 MPa, no Od. 133.5 MPa, yes e. 123.5 MPa, yes

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Consider a dislocation condition as shown below. A) what is the strain state in the upper region and B) how would addition of small impurity atoms in the region indicated by "*"s change it? oooooo OOOOO DO Select one: a. Compressive, would reduce compressive strain O b. Tensile, would decrease tensile strain O C. Compressive, would increase compressive strain Od. Tensile, would increase tensile strain Oe. Shear, would increase compressive strain

In order to find out the effects of the grain sizes on the mechanical strength of a metal, three different grain sizes of 10 µm, 500 nm and 10 nm were produced. What will be the yield stresses of these same metals at different average grain sizes? The yield strength for a grain or reference point is 78 MPa, while the material proportional constant is 29.2 MPa-mm1/2.

the behaviour of graphite materials under stress

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A 3105 aluminum plate is reduced from 4.38 cm to 2.88 cm. Determine the final properties of the plate. See attached figure

The yield strength for an alloy that has an average grain diameter of 5.2 x 102 mm is 110 MPa. At a grain diameter of 6.3 x 103 mm, the yield strength increases to 251 MPa. At what grain diameter, in mm, will the yield strength be 222 MPa? d = mm

Consider a single crystal of a hypothetical metal that has the BCC crystal structure. A stress of 50 MPa is applied in the [101] direction of the BCC unit cell.a. Determine the most favourable slip direction for the (011) slip plane of the BCC unit cell. ⟨111⟩ is the family of directions with the highest linear density in the BCC unit cell.b. If τcrss = 27.5 MPa, determine if the single crystal yields. If not, what stress level is required?c. What is the minimum stress at which the BCC single crystal yields?

9. Consider a metal rod, whose grain size can be adjusted by different processing techniques. The graph below shows how the yield stress changes with grain size d; the x-axis is logarithmic. The curve reaches a limiting value of 60 MPa as indicated by the horizontal dashed line on the y-axis, for very large grain sizes. Also, you are given the information that at d = 25 microns (vertical dashed line), the yield stress is 100 MPa. Using this information, what will be the yield stress at d = 5 microns? Select the closest numerical value. Use the Hall-Petch relation in working out your answer. Yield stress (MPa) ● ● 228882S 130 120 110 100 60 10⁰ 10¹ 10² Grain size d (microns) 132.4 MPa 149.4 MPa 165.2 MPa 156.3 MPa 10