Selecting Materials

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Slide 1

Selecting Materials Product work association Mechanical properties Physical properties Families of Materials first screening

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Customer Needs Formulation Customer prerequisites Importance weights Eng. attributes House of Quality Eng. Outline Spec's Concept Design Abstract epitome Physical standards Material Geometry ? Arrangement Design When do we choose particular materials? plan of parts/components (i.e. molding materials)

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Formulation Concept Design fabricating forms materials Configuration Design Parametric Design Detail Design Therefore, we should look at…

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Interdependence - similarity Material Properties Manufacturing Processes good materials & forms

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Interdependence - capacity able procedures for the geometry Manufacturing Processes Product Geometry

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Product capacity is related Material Properties Product Function Manufacturing Processes Product Geometry

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Example Design a support for the electric engine Tekniker-ILL neutron monochromator

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Example Tekniker-ILL neutron monochromator

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Example Tekniker-ILL neutron monochromator

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Example Tekniker-ILL neutron monochromator

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Material properties Mechanical properties amounts that describe the conduct of a material because of outer, or connected powers Physical properties amounts that portray the conduct of a material in light of physical marvels other than mechanical powers … (e.g. for example, warm, power, radiation)

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pliable ? weak versatile plastic Mechanical properties firmness ? Quality = push at disappointment = (failure)

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Mechanical properties

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Fundamental properties

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Fundamental properties

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Materials Metals Plastics Ceramics Composites Family (Ashby) Ferrous Thermoplastics Thermosets Non-ferrous Sub-family Elastomers Material families/sub-families

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Family Sub-family Classes Material sub-families/classes Materials Metals Ferrous Cast press Carbon steel Alloy steel Stainless steel

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Metals Ferrous Non-ferrous cast press carbon steel combination steel stainless steel aluminum metal bronze copper lead magnesium nickel tin titanium tungsten zinc

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Polymers Thermoplastics Thermosets Elastomers ABS acetal acrylic nylon polycarbonate polyethylene polypropylene polystyrene vinyl alkyd epoxy melamine phenolic polyester urethane butyl fluorocarbon neoprene nitrile polysulfide elastic silicone Natural and engineered rubbers Polymers

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Polymers No concoction response Cross-connecting

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Ceramics alumina beryllia precious stone magnesia silicon carbide silicon nitride zirconia Ceramics

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Composites carbon fiber fired lattice glass fiber Kevlar metal network Composites

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Composites Manufacturing process Carbon fiber Style 282 bidirectional. Araldite epoxy tar with HY956 added substance.

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Composites College Park Foot Otto Bock Advantage Ossur Flexwalk Pie protésico dinámico 2004 Pie protésico dinámico 2005

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Composites Marlon Shirley Ossur Cheeta Flex-Foot Cameron Clapp Otto Bock C-Leg Date of birth: April 21, 1978 Hometown: Thatcher, Utah Current Home:San Diego, CA Date of birth: Sep 15, 1986

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Property profiles by family

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Materials choice imminent materials and procedures rejected materials and procedures practical? manufacturable? screening attainable materials and procedures relative execution? rating best material(s) and procedures

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Screening: How would we pick a material? Item work relies on… material, producing process, geometry We need to consider every one of the three Do we choose a couple of attainable materials first… then select the particular mfg handle? on the other hand Do we choose a couple of attainable mfg forms… then select the particular material?

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Screening: Materials first approach Application Information Applied burdens extent cyclic nature (consistent, weariness) rate (moderate, affect) length (crawl) Ambient conditions temperature dampness daylight compound fluids/vapors Safety Cost

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Screening: Manufact handle first approach Part Information Production volume Part measure (generally speaking) Shape capacity (highlights) supervisor/sadness 1D manager/wretchedness >1D gaps undermines (inner/outside) uniform dividers cross segments (uniform/customary) rotational symmetry caught holes

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Materials determination imminent materials and procedures rejected materials and procedures useful? manufacturable? screening possible materials and procedures relative execution? rating best material(s) and procedures

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Rating: Material records Given a similar cost/volume… which is more grounded? file = Strength/cost Given a similar cost/volume… which is stiffer? file = Young's modulus/cost

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Ashby Chart How would we be able to utilize it?

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Summary Product work reliance Mechanical properties Physical properties Families, sub, classes of materials Ashby diagrams Materials first approach Process first approach

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