Fountain_Polymers in Fatigue

Fountain_Polymers in Fatigue - AnIntroductiontoPolymers

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Click to edit Master subtitle style An Introduction to Polymers General Overview and Microstructure-based Multistage Fatigue Modeling  of an Acrylonitrile Butadiene Styrene Copolymer Jason E. Jason@cavs.msstate.edu
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Outline q Polymers in general q Types and applications q Crystallinity and damage q Microstructure-based Multistage Fatigue Modeling of Acrylonitrile Butadiene Styrene q MSF modeling q What is ABS? q ABS microstructure q Monotonic properties q Fatigue q Hysteresis q Temperature generation
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Polymers in General Thermoplastics – melt when heated, easily formed, can be reheated and reformed after processing. (i.e. polycarbonate, Acrylonitrile Butadiene Styrene) Thermosets – crosslinked polymer, typically after initial processing and formation, heat introduced causes crosslinking which is generally irreversible. (i.e.) Thermoplastic Elastomers – reversible crosslinks through noncovalent bonding, recyclable, durable. (i.e. Poly(styrene-butadiene-styrene) “SBS” Rubber) Used for automotive hoses, shoe soles and tire treads For more please visit: http://www.pslc.ws/mactest/level1.htm Note: the use of polyurethane (thermoplastic) soles is becoming more common now Thermoplastic (left); Crosslinking (right) denoted by black dots in a thermosetting polymer
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Polymers in General Elastomers (Rubbers) elastomer means shows elastic properties , ‘bounce’ back when stretched, can generally undergo large deformations and return to original state. (i.e. polyurethane ‘thermoplastic’ and polybutadiene ‘rubber’, Polysiloxane ‘silicones’ « Fibers – polymer chains that have been stretched out to linear and typically made up of crystals, can be spun to create threads, have good tensile properties (i.e. Nylons, Kevlar, polyurethanes) For more please visit: http://www.pslc.ws/mactest/level1.htm
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Polymers in General Crosslinked Polymers chemical (vulcanization) or mechanical cross branch of polymer chains, makes elastomers/plastics stronger, but don’t melt leading to difficulties in recycling; reversible crosslinked materials are called thermoplastic elastomers (i.e.) For more please visit: http://www.pslc.ws/mactest/level1.htm Composite generally, a component made either synthetically or natural occurring by combining two or more materials of completely different mechanical or chemical compositions that remain separate at the macro or micro scale. (i.e. Carbon fiber, long and thin graphite structure where HCP aromatic rings are aligned, is used with a thermoset epoxy resin, CF is called a composite (Can all materials be considered a composite? Can any material be completely free of inclusions or defects?)
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Polymers in General Amorphous polymers – random chain orientation, gradual softening with increased Temperature [examples: polycarbonate (PC), acrylonitrile butadiene styrene (ABS)] Semi-crystalline – contain both crystalline and amorphous portions [examples: thermoplastic polyimide, polyvinyl alcohol]
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Fountain_Polymers in Fatigue - AnIntroductiontoPolymers

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