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Unformatted text preview: Question 1 - Answers (a) Identify and compare basic classifications of materials. 1. Metals 2. Ceramics 3. Polymers Density Stiffness Strength Electrical Conductivity Metals Highest High Strongest Highest Ceramics Comparatively Low High Comparatively Strong Low Polymers Lowest Comparatively Low Comparatively Weak Low (b) Describe composite material types with examples. 1. Particulate – ex: unreinforced concrete 2. Short fiber – ex: Fiber glass 3. Long fiber – ex: Carbon fiber, Aramid fiber (Kevlar®) 4. Laminate – ex: Formica (c) Give examples of advanced materials. 1. Semiconductors 2. Biomaterials 3. Smart Materials 4. Nanoengineered Materials (d) Describe smart materials and nano engineered materials with examples. 1. Smart materials are a group of new and state-of-the-art materials which have a great influence on today’s technology. These materials are capable of sensing the environmental conditions around them and responding to changes that occurs in the surrounding. Ex: shape memory alloys, piezoelectric ceramics, magnetostrictive materials, electro rheological / magneto rheological fluids. 2. Nano engineered materials are materials which the atoms and molecules are changed and manipulated in the atomic-level. By changing the formation of atomic-level constituents into a totally new structure in a certain material a Nano engineered material is made. These materials are carefully arranged to get specific mechanical, electrical and magnetic properties which are not available in general. Ex: Carbon Nanotube Question 2 – Answers (a) Write the differences between atomic mass and atomic weight. Write the differences between atomic mass and atomic weight....
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This note was uploaded on 10/30/2011 for the course MECHATRONI EN11ME2050 taught by Professor Perera during the Spring '11 term at Asian Institute of Technology.
- Spring '11