MEEN 475 Midterm

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School

Texas A&M University *

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Course

475

Subject

Material Science

Date

Feb 20, 2024

Type

pdf

Pages

7

Uploaded by cabazhaw

r /_ MEEN47S Materials in Design Fall 2023 Name: e You have 50 minutes Midterm Exam « This is a work-alone, closed-book, no-notes exam. ¢ You may use a ruler and a calculator. o « Turn off all other electronic devices other than your PC. Your camera should be on. « No Questions: If you think a problem is wrongly worded or there is a mistake or missing information, state what you think the mistake or missing information is and what assumption you are going to make and then continue. « Failure to follow the Honor Code will result in automatic failure of the course. “I have read and understand the exam Rules & Restrictions” ’ ; . F ; i “On my honor, as an Aggie, | have neither given nor Egefled unauthorized aid on this academic work Signa Questions Point Value Score Problem 1 24 Problem 2 20 Problem 3 30 Problem 4 26 Total
MEEN 475 Materials in Design Fall 2023 Problem 1 (24 pts.) T/F (Truel/False): 2 pts. each @ - Increasing the content of Niquel on a Cooper-Niquel alloy increases the yield strength. © _F_ Inlow carbon steels, increasing the C content generally decreases the strength. 3. _T_ Investment casting involves melting out a wax pattern and filling the resulting cavity with metal. C L_ In slip casting, a shell or preform is heated and compressed by an external gas pressure. 133 5. 1 Ina material selection process, the material index had the following term:(f'_) . The p slope is 3 onthe p—E chart where density is on the x-axis of the chart. 6. _[ Ina hypothetical material selection process, the objective was to minimize the weight and free variable was the t-thickness. The following is an acceptable equation to select the material 1/2 . 12t P from the charts: m= {?j (L)(EE] i ] (7> 1_Few polymers can be used above 200°C 8. T In the material cost analysis the Cv.ris simply pCm Multiple Choice (8 pts. 2 pts. each) (one correct answer) 1. Fiber reinforced composite materials parts can be made by: a. Extrusion b. Injection molding (c_Filament winding d. Blow molding 2. Metals have a wide range of strengths on the p—¢c because: a. They have high melting points. (b Their strength depends on composition and processing. c. They generally have low elastic modulus. d. They have high densities. 3. Which of the following materials is most likely not suitable for use in a 300 °C application? a. Metals. (6> Polymers. c. Glasses. d. Ceramics. 4. Which material is the best choice for a high strength, high stiffness and low weight application? 3) Carbon fiber reinforced composites. . Polymers. c. Rigid polymer foams. d. Concrete.
MEEN 475 Materials in Design Fall 2023 Problem 2 (20 pts.) tile assembly and for ducting for Channel sections for window frames, for slide-together sections for versa rder is for 100,000 such sections, electrical wiring can be complex in shape. Figure 1 shows an example. The o A each 1 m in length and weighing 1.2 kg, with a minimum section of 4 mm. Atolerance of 0.2 mm and a surface_ w must be achieved without any additional finishing operation. (a) List the constraints, leave the objective blank and “Choice of process” is the free variable. (b) Use the charts of Chapter 7 to identify 2 possible processes to make the casing. Figure 1: Channel Cross Section Shape an aluminum section with a complex profile weut |2k, e punimum Seekiow Hmm Folevauce o 0. o curfree vougmess less Jum ® /00,000 batehy Function Constraints length 1 ® Mo a&ol{'houa'( J\M's‘l“.f] OPefld’wM Objective . Free variables | e Choice of process r es” g H \O> eossfio\( {JfOCtiSS M s awogg,blp f;rocegj beCaqu T on all of) the cnrts 3\/\@6"( 'fiwm;ufi 5 afOSS,EI( p/C((’SL loecaise 3 ¥ fiv\lls whuh ok Hie V‘w\:je’&
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