(B) What is the meaning of each the following :(choose four only) 1. Synthesis 2.Nanostructured materials 3.Composite materials 4.Environment-friendly materials S.A.S.M.E
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- When answering the following questions , ensure that you explain in terms of both the microscopic and macroscopic structure of the materials. A) polymer - explain the difference in structure between a thermoplastic and thermoset material and explain how the structure accounts for the key generic properties of those polymers. B) composite material - for a particular composite and a fibre reinforce composite , explain the difference in structure and whst structual features dictate the properties of the material.These are some characteristics of composite materialsChoose an optionA) They are manufactured with the intention of preserving the individual properties of each of its components.B) The matrix is the phase that is found in greater proportion and houses the dispersed phase, which is responsible for resisting mechanical stresses.C) The structural can be formed by layers or sheets forming an isotropic material.D) The alignment of the fibers in a polymeric matrix does not affect the tensile or compressive strength.1. The schematic shown below represents high and low values of which of the following thermal properties of materials? A. Diffusivity B. Conductivity C. Thermal Expansion D. Heat capacity 2. Which one of the following does not represent one of the six families of materials? A. Metals B. Ceramics C. Woods D. Hybrids 3. Which one of the following is not a typical property of a glass? A. High hardness B. Electrically Insulating C. Transparency D. High Toughness 4. Which of the following material properties is most appropriate for describing the stiffness of a material? A. Young's Modulus B. Yield Strength C. Fracture Toughness D. Fatigue Limit 5. The failure of the aircraft wing shown below, when loaded to its design stress, suggests the following about the material it is manufactured from A. Not stiff enough B. Too low a yield strength C. Too low a fracture toughness D. Too high a ductility
- 2) A biomedical company is planning to design a robotic arm from polymeric biomaterials based on their stress-strain curves. You as a bioengineer/researcher in this company, are requested to choose the best material from different biomaterials (A, B, C, D, E, and F) based on their mechanical properties. Express your opinion shortly on the following questions? a) Difference between A and C? b) Difference between B and D? c) Difference between F and E? d) What would be your recommendation for the robotic arm? Why? Stress (MPa) 10.0 7.5 5.0 2.5 0.0 0 C 5 D Strain (%) 10 E F 15Q1: What are the two main types of characterization of smart materials? Using as few words as possible, explain the difference between them. Moreover, show that the idea of characterization is true by giving a working example per each type.These are some characteristics of advanced ceramic materialsChoose an option A) Its composition is not exact, having a great variety of minerals in its raw materials.B) They need a sintering process for their manufacture.C) Sintering must be done with compacted raw materials in powder form and must reach the melting temperature of all its components.D) Its particles must have a micrometric diameter to facilitate sintering.E) What allows them to have the final solid form is the vitreous league.F) They are fragile and not very resistant to changes in temperature
- Which of the following is incorrect regarding the degree of crystallinity of semi-crystalline polymers? (This question has more than one correct answer) a. Increasing the degree of crystallinity generally increases polymer strength, elastic modulus and ductility in semi-crystalline polymers b. Semi-crystalline polymers are heat treated to increase the crystallinity and improve polymer strength c. The tendency of a polymer to crystalize decreases with increasing molecular weight d. Heat treatment always results in enhanced polymer strength, elastic modulus and brittlenessQ4: The well-known that glass fibers are widely used in the manufacture of composite materials: 1. What are the general drawbacks and benefits of glass fibers? 2. Classify the types of glass fibers. 3. Explain each type briefly. 4. How can recognize among each type by a designer? 5. Why there is a difference in the physical properties in comparison to each other? Q5: If the affordability of equipment does not matter for a designer, 1. What is the best technique can be used by the designer to produce missiles parts made of a fiber with high strength/weight proportion? | 2. What are the benefits and drawbacks of that technique? 3. Give examples for other engineering applications of that technique. 4. What is the best type of polymer resins can be used in this technique and why? 5. Explain this technique briefly.Q2/ Determine the weight and number average molecular weights as well as degree of polymerization for the polypropylene materials. Number Range of Molecular weight in gram/mol and weight fractions X₁ W₁ 8000- 16000 0.05 0.02 16000- 24000 0.16 0.1 24000- 32000 0.24 0.2 32000- 40000 0.28 0.3 40000- 48000 0.20 0.27 48000- 56000 0.07 0.11
- Plastics may exhibit a change in properties as they age, particularly when subjected to elevated temperatures. Material properties such as tensile strength will increase with an increasing temperature as a function of increasing time. True or false.Show the typical Stress versus Strain curve for the following materials, and define the materials properties "The stress-strain curve can be used to read off the structural load ability of materials. For many materials, including metals, their loading bearing capability is one of the most important material properties". by reference to the diagram: a) Hammer head is made from hardened tool steel b) Smelter is made from refractory ceramic c) Cable is made from pure copper d) Box is made from polypropyleneNOTE: ANSWER ALL QUISTIONS Q1) Answer the following questions. (C..v. 1- Explain the selection of engineering materials for applications depend on which properties. 2- Why the nanomaterials have outstanding mechanical and physical properties? 3- Draw and explain the differences between crystalline and non-crystalline solids. 4- Draw and explain bond type of NaCl compound atoms. 5- Why the crystalline material is favourite than non-crystalline materials?