Chapter8ba - ©2003 Bil Young 1 Materials & Processes...

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Unformatted text preview: ©2003 Bil Young 1 Materials & Processes in Manufacturing ME 151 Chapter 8 Nonmetallic Materials: Plastics, Elastomers, Ceramics, & Composites ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 2 Examples of test questions The following material mechanical property would be pertinent to the design of a machine part which can not tolerate permanent set. A. Ultimate Strength B. Yield Strength C. Proportional Limit D. Breaking Strength Manufacturing is the interrelationship of materials, personnel, methods, and equipment combined to achieve low cost, superior quality, on- time delivery of goods and services. (True or False) ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 3 Introduction Nonmetallic materials make up a large group of materials which offer a wide range of properties Nonmetallic materials are made up of both natural and man-made materials, with new materials being continually introduced Provide general knowledge of the basic nature and properties for the following nonmetallic materials • Plastics • Elastomers • Ceramics • Composites ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 4 Plastics Plastics are _____ or ________ resins, or their compounds, that can be molded, extruded, cast or used as thin films or coatings General properties of plastics: Attractive Properties Unattractive Properties Light weight Poor strength properties Corrosion resistance Low impact strength Electrical resistance Poor dimensional stability Low thermal conductivity Heat sensitivity Optical properties UV sensitivity Formability Surface finish Low cost Low energy content ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 5 2 Basic Categories of Plastic Materials Thermoplastic and Thermosetting refer to the materials response to elevated ________________ ___________ Materials - Material can be heated and hardened repeatedly without a chemical change to the material Heat >> Form to Shape >> Cool to Retain Shape Easy to mold, easily recyclable, lower strength, good ductility ______________ Materials - Characterized by an irreversible chemical reaction that occurs at elevated temperatures...
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This note was uploaded on 04/19/2008 for the course ME 151 taught by Professor Alant.male during the Spring '08 term at Kentucky.

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Chapter8ba - ©2003 Bil Young 1 Materials & Processes...

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