ࡱ>  2)bjbjVV I?@_=_=_=^^[H_=_=_=BBBB_=_=_=_=_=_=_=_=_=+ 7:  Lesson 2.2 Material Properties Concepts Materials are the substances in which all things are made. Materials are composed of elements and area categorized by physical and chemical properties. Materials consist on pure elements, compounds and mixtures and are typically classified as metallic, ceramic, organic, polymeric, and composite. Material properties including recyclability and cost are important considerations for engineers when choosing appropriate materials for a design. Material selection is based upon mechanical, thermal, electromagnetic, and chemical properties. Raw materials undergo various manufacturing processes in the production of consumer goods. Essential Questions How does an engineer predict the performance and safety for a selected material? What are the advantages and disadvantages of utilizing synthetic materials designed by engineers? What ethical issues pertain to engineers designing synthetic materials? What did you learn about the significance of selecting materials for product design? How can an existing product be changed to incorporate different processes to make it less expensive and provide better performance? How does an engineer decide which manufacturing process to use for a given material? How do the recycling codes and symbols differ from state to state? Key Terms Additive ProcessThe process of creating an object by adding small pieces or layers together to make a final product.CeramicOf or relating to the manufacture of any product (as earthenware, porcelain, or brick) made essentially from a nonmetallic mineral (as clay) by firing at a high temperature.CodesA systemized body of laws; a set of principles, as of ethics.CompositeSolid material which is composed of two or more substances having different physical characteristics and in which each substance retains its identity while contributing desirable properties to the whole; especially, a structural material made of plastic within which a fibrous material (as silicon carbide) is embedded.Decision MatrixA tool for systematically ranking alternatives according to a set of criteria.FinishingMachining a surface to size with a fine feed produced in a lathe, milling machine, or grinder.FormingA process that changes the size and shape of a material by a combination of force and a shaped form. LiabilityAnything for which a person is legally bound or responsible. ManufacturingTo make into a product suitable for use; to make from raw materials by hand or by machinery; to produce according to an organized plan and with division of labor.MaterialThe elements, constituents, or substances of which something is composed or can be made; matter that has qualities which give it individuality and by which it may be categorized.Mechanical PropertiesThose properties of a material that reveal the elastic and inelastic reaction when force is applied, or that involve the relationship between stress and strain; for example, the modulus of elasticity, tensile strength, and fatigue limit. MetalsAny of various opaque, fusible, ductile, and typically lustrous substances that are good conductors of electricity and heat. Physical PropertiesProperties other than mechanical properties that pertain to the physics of a material and can usually be measured without the application of force.PolymersAny of numerous natural and synthetic compounds of usually high molecular weight consisting of up to millions of repeated linked units, each a relatively light and simple molecule.Product Life CycleStages a product goes through from concept and use to eventual withdrawal from the marketplace.Raw MaterialCrude or processed material that can be converted by manufacture, processing, or combination into a new and useful product; something with a potential for improvement, development, or elaboration.RecyclingReturning to an original condition. The extraction and recovery of valuable materials from scrap or other discarded materials.SubtractiveProcesses that remove material to change the size, shape, or surface of a part. There are two groups of separating processes: machining and shearing.SyntheticProduced by the combining of parts or elements to form a whole, rather than of natural origin; not real, artificial.  Instructional Resources Presentations HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\PowerPoints\\Introduction To Materials.ppt"Introduction to Materials HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\PowerPoints\\IntroductionManufacturingProcesses.ppt"Introduction to Manufacturing Processes HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\PowerPoints\\RecyclingMaterials.ppt"Recycling Materials SME Videos (These are a separate download from the Virtual Academy) Word Documents HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\YN4O12ST\\Activities\\A2_2_1ProductAnalysis.doc"Activity 2.2.1 Product Analysis HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\YN4O12ST\\Activities\\A2_2_2ManufacturingProcesses.doc"Activity 2.2.2 Manufacturing Processes HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\YN4O12ST\\Activities\\A2_2_3Recycling.doc"Activity 2.2.3 Recycling HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\YN4O12ST\\Activities\\A2_2_3aRecyclingFacts.doc"Activity 2.2.3a Recycling Facts HYPERLINK "C:\\Documents and Settings\\012291\\Local Settings\\Temporary Internet Files\\Content.IE5\\YN4O12ST\\Activities\\L2_2KeyTermCrossword.doc"Lesson 2.2 Key Terms Crossword  Reference Sources Agnes, M. (ed.). (2004). Websters new world dictionary and thesaurus. Cleveland, OH: Wiley Publishing, Inc. CustomPart.net. (2007). Custompart.net beta. Retrieved March 12, 2008, from http://www.custompartnet.com General Chemistry Online. (2005). General chemistry glossary. Retrieved January 31, 2008, from www.antoine.frostburg.edu Giambattista, A.; Richardson, B., & Richardson, R. (2004). College physics. New York, NY: McGraw-Hill. Illinois Engraving and Manufacturing Company. (n.d.) Illinois engraving provides hot stamping dies faithfully reproduced from artwork, drawing or instructions. Retrieved April 14, 2008, from http://www.illinoisengraving.com/id10.html International Technology Education Association (ITEA). (2002). Standards for technological literacy. Johnson, C., & Lockhart, S. (2000). Engineering design communication: Conveying design through graphics. Upper Saddle River, NJ: Prentice Hall. Krar, S., Rapisarda, M., & Check, A.F. (1997). Machine tool and manufacturing technology. Clifton Park, NY: CENGAGE Delmar Learning. MatWeb. (2008). MatWeb material property data. Retrieved February 29, 2008, from www.matweb.com McGraw-Hill dictionary of engineering. (2nd ed.).(2003). New York, NY: McGraw-Hill. Microsoft, Inc. (2008). Clip art. Retrieved January 10, 2008, from http://office.microsoft.com/en-us/clipart/default.aspx Merriam-Webster Online. (2008). Merriam-Webster online. Retrieved January 31, 2008, from www.m-w.com NASA. (n.d.). Science @ NASA. Retrieved January 31, 2008, from http://science.nasa.gov NASAexplores. (n.d.). NASAexplores express lessons and online resources. Retrieved March 12, 2008, from http://media.nasaexplores.com/lessons/02-045/9-12_2.pdf National Council of Teachers of English (NCTE) and International Reading Association (IRA) (1996). Standards for the English language arts. Newark, DE: IRA; Urbana, IL: NCTE. National Council of Teachers of Mathematics (NCTM). (2000). Principles and standards for school mathematics. Reston, VA: Author. National Research Council (NRC). (1996). National science education standards. Washington, D. C.: National Academy Press. Serway, R., & Faughn, J. (2003). College physics. (6th ed.). Pacific Grove, CA: Thomson Learning, Inc. The Engineering Toolbox. (2005). Engineering toolbox. Retrieved February 29, 2008, from http://www.engineeringtoolbox.com Wright, T. (2006). Manufacturing and automation technology. Goodheart-Wilcox Publications.      Project Lead The Way, Inc. 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