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midterm cheat sheet

midterm cheat sheet - ENGR 112 midterm cheat sheet Research...

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ENGR 112 midterm cheat sheet Research: Basic Research-Gov. Labs, Research Universities Engineering Research-Corporate Labs, Universities, R&D Consortia, entrepreneurs Product development-Corporate product development groups The design process Product development cycle Materials and differences in materials-chart Natural Materials, Metals-ranges in stiffness and strength (low and high), ranges in melting temp (low and high), very tough, and has a moderate cost to manufacture Ceramics-very strong and stiff, the highest melting temp, very brittle, very expensive to man Composites-strong and stiff, usable at room temp, designed to be tough, expensive Polymers-large molecules made up of large #s of repeating units, strong CC covalent bonds in chain-not strong and stiff, low melting temp, tough (wont crack if dropped), low cost Thermoset-bonds formed chemically between long strands (of polymer molecules)-covalent bonds, permanent, very strong and usually can’t be melted and reused Thermoplastic-hydrogen bonds hold strands together (weak)-injection molds, recyclable plastic, can heat, melt and reuse, reversible Manufacturing processes Silicone Molding (only thermosets)-starts with pattern and sheet in between is where mold will split, pour silicon rubber around pattern to create mold, pour epoxy, polyurethane, etc. into mold to create piece, not
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