Presentation on theme: "ENGR 45 Property of Materials, SRJC Section 4214 Instructor: Dr. Younes Ataiiyan Property of Materials Project, Fall 2011 December 12, 2011 TENSILE TEST."— Presentation transcript:
ENGR 45 Property of Materials, SRJC Section 4214 Instructor: Dr. Younes Ataiiyan Property of Materials Project, Fall 2011 December 12, 2011 TENSILE TEST COMPARISON OF PLASTIC WELDS Melissa Meikle Jonathan Hromalik Christopher Bivins Keith Malkassian
Vinyl polymer, made from monomer ethylene Simple structure (simplest of all commercial polymers) Molecule is a long chain of carbon atoms, with two hydrogen atoms attached to each carbon atom Some carbons will have long chains of polyethylene attached instead of hydrogen, which is called branched or low-density polyethylene (LDPE) When there is no branching, it is called linear polyethylene (HDPE) HDPE has a low degree of branching and thus stronger intermolecular forces and tensile strength than LDPE LDPE is cheaper and easier to make.
POLYETHYLENE Most popular plastic in the world Annual production of approximately 80 million metric tons Polymer that makes grocery bags, shampoo bottles, children’s toys, and bullet proof vests Polyethylene with molecular weights of three to six million is referred to as ultra-high molecular weight polyethylene (UHMWPE), which can be used to make fibers which are so strong they replaced Kevlar for use in bullet proof vests Large sheets of it can be used instead of ice for skating rinks HDPE is used in products and packaging such as milk jugs, detergent bottles, margarine tubs, garbage containers and water pipes 1/3 of all toys are manufactured from HDPE
ACETAL (DELRIN ®) SampleInitial Area (in)Maximum Force (lbf)Tensile Strength (psi) Delrin0.1521203913409.79
Also known as Polyoxymethylene (POM) Thermoplastic produced by the addition polymerization of an aldehyde through the carbonyl function, yielding unbranched polyoxymethylene chains of great lengths Acetal resins are among the strongest and stiffest of all thermoplastics Characterized by good fatigue life, low moisture sensitivity, high resistance to solvents and chemicals, and good electrical properties Acetals may be processed by conventional injection molding and extrusion techniques Two types: homopolymer and copolymer Homopolymer: semi-crystalline polymer, harder, have high resistance to fatigue, more rigid, higher tensile and flexural strength with generally lower elongation Copolymer: remain stable in long-term, offers exceptional resistance to the effects of immersion in water at high temepratures
ACETAL (DELRIN ®) Used in precision parts that require high stiffness, low friction and excellent dimensional stability Main area of application for acetal is industrial and mechanical products Gears, Bearings, Bushings, Rollers, Fittings, Electrical insulator parts Music: picks, Irish flutes, Bagpipes Sports: Paintball accessories (machined parts of paintball markers that do not require the strength of aluminum such as handles) and airsoft guns
ACRYLIC SampleInitial Area (in)Maximum Force (lbf)Tensile Strength (psi) Acrylic0.0968155516070.38 Acrylic (Heat Weld)0.132169522.24 Acrylic (Solvent Weld)0.150285566.04
A common plastic material containing one or more derivatives of acrylic acid. The most common derivative is poly- methyl methacrylate (PMMA), better known as Plexiglass. PMMA is made from the Methyl methacrylate monomer (C5H8O2). Acrylic is transparent, and resistant to UV radiation and weathering. It a brittle material but not so much so that it can’t be cut, drilled or formed. ACRYLIC
Acrylic is a very common polymer that has many practical applications. It is used for airplane windshields, skylights, automobile taillights, and outdoor signs. The ceiling of the Houston Astrodome is composed of hundreds of double-insulating panels of PMMA The high tensile strength of this material makes it ideal for submarine windows and aquarium windows as well.
Full Name: Acrylonitrile Butadiene Styrene Light weight an injection moldable A material of choice for rapid prototyping Combines the strength and rigidity of the acrylonitrile and styrene polymers with the toughness of the polybutadiene rubber. Drain-waste-vent pipe systems, musical instruments, automotive trim components, automotive bumper bars, enclosures for electrical and electronic assemblies, protective headgear, canoes, small kitchen appliances, Legos