3. The sketch below shows 3 co-planar parallel screw dislocations.

F) Based on your answer to part E), sketch the crystal structure for InP. Remember, the definition of a lattice parameter is how far you have to go along a direction that the atoms or ions touch until you reach an equivalent atom or ion. Do not switch between crystal systems for the rest of the problem. You will be graded partly on how consistent you are. You can refer to figures on the formula sheet if the unit cell is too difficult to draw.

P.1.2. At a point in an elastic material, there are two mutually perpendicular planes, one of which carries a direct tensile stress of 50 N/mm² and a shear stress of 40 N/mm2, while the other plane is subjected to a direct compressive stress of 35 N/mm and a complementary shear stress of40 N/mm?. Determine the principal stresses at the point, the position of the planes on which the act, and the position of the planes on which there is no normal stress. Answer:O1 = 65.9 N/mm²,0 = 21°38' O = -50.9 N/mm2, 0 = 111°38'

P.1.10. In Fig. P.1.10, the direct strains in the directions a, b, c are -0.002, -0.002, and +0.002,respectively. If I and II denote principal directions, find ɛ1, E, and 0. \text { Answer: } \quad \varepsilon_{\mathrm{I}}=+0.00283, \quad \varepsilon_{\mathrm{II}}=-0.00283, \quad \theta=-22.5^{\circ} \text { or }+67.5^{\circ}

What are the disadvantages of powder metallurgy process: a) high tooling and equipment cost; b)metallic powders are expensive; c. process wastes a lot of starting powders; d) limitation on partgeometry

N) Calculate d131, the d-spacing for the (131) plane, regardless of whether it is seen by XRD.

Brief: An aircraft manufacturer has asked a consulting engineer (you) to prepare a short report on experimental stress analysis techniques that could be used for design, testing, or in-service monitoring of structural components. They are particularly interested in the electrical resistance strain gauge and digital image correlation methods. Prepare a short report for the company which covers both electrical resistance strain gauging and digital image correlation for use in experimental stress analysis. The report should briefly introduce experimental stress analysis and its relevance, introduce strain gauges and digital image correlation methods and give relevant background to each. You should then cover the fundamental concepts and mode of operation (how it works!) associated with each technique and give guidance for obtaining accurate measurements. Finally, critically compare the methods, give suitable applications for each technique in aircraft engineering and offer conclusions and recommendations to the aerospace company using the information you have gathered as evidence.

Q1. Calculate the activation energy for vacancy formation in aluminum, given that the23-3equilibrium number of vacancies at 500°C (773 K) is 7.57 × 10 m .The atomic weight and3density (at 500°C) for aluminum are, respectively, 26.98 g/mol and 2.62 g/cm . (7 marks)

3-Determine whether each of the electron configurations given below is an inert gas, a halogen, an alkali metal, an alkaline earth metal, or a transition metal. Justify your choices. (You can use the periodic table and the electron configuration table – Callister book) \text { (a) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{7} 4 s^{2} \text { (b) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} \text { (c) } 1 s^{2} 2 s^{2} 2 p^{5} \text { (d) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} \text { (e) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{2} 4 s^{2} \text { (f) } 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}

Case Study on Wear Search for a component with wear on the surface. You have been requested for your professional opinion of the wear of this component, its characteristics, severity, type, and cause. 1. Describe the characteristics of the worn zone (Attach a picture of possible) 2. Indicate what type of wear it is. 3. Explain the reason for your judgement. Write this as a professional opinion; as if you were being paid for it. You want your customer to be happy with the quality of your opinion; so they will come to you with their next tribological problem.