Assignment 1 - Q1(a Identify and compare basic...

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Q1 (a) Identify and compare basic classifications of materials. Qualities Metal Ceramic Polymers Composed Element Metallic elements and non-metallic elements in same amount Compounds between metallic and non- metallic elements Organic compounds based on H,C,O and non-metallic elements Density High density Lower that metals Lower than metals and ceramics Stiffness Very stiff Very stiff lack of ductility Lower than metals and ceramics extremely ductile and pliable. Electric and thermal conductivity High conductivity Insulators Low conductivity Resistance to fracture Highly resistance to facture Lower than metals Lower than metals and ceramics (b) Describe composite material types with examples. Composites are made by two or more Individual materials There are two types of composites. 1. Natural composites -(wood,borns) 2. Synthetic composites -(Fiberglass,CFPP) (c) Give examples of advanced materials. There are three types of advanced materials 1. Semi-Conductors Materials than have electrical properties that are intermediate between the electrical conductors. Eg-Si,Ge,Ga. 2. Bio-Materials Materials, Composites that are non-reactive with body Eg-Platinum 3. Smart materials Eg- Actuator, Sensor, Piezo Composites MFC -Macro Fiber Composite 4. Nanoengineered Materials (d) Describe smart materials and nano engineered materials with examples
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Nano Engineered Materials Description Smart materials are a group of new and state-of-the-art materials. Smart materials are able to sense changes in their environments and then respond to these changes in predetermined manners ability to carefully arrange atoms provides opportunities to develop mechanical, electrical, magnetic, and other properties that are not otherwise possible Examples 1. Electroactive Piezoelectric Materials Ionic Polymers Magneto/Electro- Rhological Fluids 2. Thermo-Active Shape-Memory Alloys 3. Magneto-Active Magneto/Electro- Rhological Fluids Magnetostrictive Materials 1. To create superhydrophobic self cleaning surfaces. 2.
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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.

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Assignment 1 - Q1(a Identify and compare basic...

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