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Presentation on theme: "Materials."— Presentation transcript:

1 Materials

2 Properties of Materials
Mechanical Properties: strength, toughness, ductility, hardness, elasticity, fatigue, creep. Behavior Under Loading: tension, compression, bending, torsion, shear. Physical Properties: density, specific heat, thermal expansion, thermal conductivity, melting point, electrical and magnetic properties. Chemical Properties: oxidation, corrosion, degradation, toxicity, flammability.

3 Types of Materials Ferrous Metals: iron and steel.
Nonferrous Metals and Alloys: aluminum, magnesium, copper, nickel, titanium, superalloys, beryllium, zirconium, low-melting alloys, precious metals. Plastics: thermoplastics, thermosets, elastomers. Ceramics: glass, graphite, diamond. Composite materials: reinforced plastics, metal-matrix and ceramic-matrix composites, honeycomb structures.

4 Ferrous Metals: Applications
Structural: building structures, concrete reinforcement Automotive: chassis, engine parts, drive train, body parts Marine: ship hulls, structure, engines Defense: tanks, weapons Consumer Products: appliances, recreational vehicles, toys, utensils and tools

5 Nonferrous Metals: Applications
Architectural: aluminum windows and doors Automotive: aluminum engine blocks, copper wiring, mag wheels Marine: brass/bronze fittings, bearings, propellers Defense: brass shell casings Consumer Products: electrical wiring, utensils, jewelry, electronics

6 Plastics (Polymers) Compared to metals, plastics have lower density, strength, elastic modulus, and thermal and electrical conductivity, and a higher coefficient of thermal expansion The design of plastic parts should include considerations of their low strength and stiffness, and high thermal expansion and low resistance to temperature.

7 Plastics: Applications
Architectural: electrical and thermal insulation, weather seals, carpets, wall coverings, paint Aerospace: electrical and thermal insulation, instrument panels,upholstery, seals Automotive: body panels, instrument panels, upholstery, electrical and thermal insulation, seals, hoses, tires Consumer Products: toys, sporting goods, appliances, tools, utensils, clothing, shoes, packaging

8 “The Process of Converting Raw Materials Into Products”
Manufacturing “The Process of Converting Raw Materials Into Products”

9 Manufacturing a Product: General Considerations
Material Selection Processing Methods Final Shape and Appearance Dimensional and Surface Finish Economics of Tooling Design Requirements Safety and Environmental Concerns

10 Choosing Methods of Production
Use a Selection Chart

11 Manufacturing Processes for Metals
Casting: expendable mold and permanent mold. Forming and Shaping: rolling, forging, extrusion, drawing, sheet forming, powder metallurgy, molding Machining: turning, boring, drilling, milling, planing, shaping, broaching, grinding, ultrasonic machining, chemical machining, electrical discharge machining (EDM), electrochemical machining, high-energy beam machining Joining: welding, brazing, soldering, diffusion bonding, adhesive bonding, mechanical joining Finishing: honing, lapping, polishing, burnishing, deburring, surface treating, coating, plating

12 Casting Processes Introduction of molten metal into a mold cavity; upon solidification, metal conforms to the shape of the cavity. Die Casting Sand Casting

13 Forming and Shaping Processes
Bulk deformation processes that induce shape changes by plastic deformation under forces applied by tools and dies. Forging Extrusion

14 Machining Processes Material removal from a work piece: cutting, grinding, nontraditional machining processes. Milling Lathe Machine

15 NC Machine Tool and Controller

16 NC Punch Press Machine

17 Manufacturing Processes for Plastics
Plastics are shipped to manufacturing plants as pellets or powders and are melted just before the shaping process. Polymers melt at relatively low temperatures and are easy to handle. Plastics can be molded and formed, as well as machined and joined, into many shapes with relative ease.

18 Injection Molding of Plastics

19 Selective Laser Sintering System
Courtesy of the University of Texas

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