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10.26mechproperties

10.26mechproperties - E45 Lecture Click to edit Master...

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Click to edit Master subtitle style E45 Lecture 10/26/09
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Specify mechanical properties of polymers by Elastic Modulus Yield Strength Ultimate Tensile Strength Mechanical Properties of polymers are sensitive to temperature, strain rate, chemical nature of the environment
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3 Mechanical Properties of Polymers – Stress-Strain Behavior Fracture strengths of polymers ~ 10% of those for metals Deformation strains for polymers > 1000% for most metals, deformation strains < 10% brittle polymer fractures in the elastic region Plastic - similar in form to curve for metals Elastomer - totally elastic, rubber- like elastic moduli less than for metals Adapted from Fig. 7.22, Callister & Rethwisch 3e .
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4 Metals Alloys Graphite Ceramics Semicond Polymers Composite s /fibers E (GPa) Based on data in Table B.2, Callister & Rethwisch 3e. Composite data based on reinforced epoxy with 60 vol % of aligned carbon (CFRE), aramid (AFRE), or glass (GFRE) fibers. Young’s Moduli: Comparison 109 Pa 0 . 2 8 0 . 6 1 Magnesiu m, Alumi num Platin um Silver, Gold Tantal um Zinc , Ti Steel, Ni Molybden um G rap hite Si crysta l Gl as s - s o d a Concr ete Si nitrid e Al oxid e P C Wood( gra in) AFRE( fib ers) * CF RE * GF RE * Glass fibers only Carb on fibers only A ramid fibers only Epoxy only 0 . 4 0 . 8 2 4 6 1 0 20 40 60 80 1 0 0 2 0 0 6 0 0 8 0 0 1 0 0 0 12 00 4 0 0 T i n Cu alloys Tungs ten <1 00 > <1 11 > Si carbide Diam ond P T F E H D P E L D PE P P Polyes ter P S P E T C FRE( fibe rs) * G FRE( fiber s)* G FRE(|| fibers)* A FRE(|| fibers)* C FRE(|| fibers)*
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5 Room temperature values Based on data in Table B.4, Callister & Rethwisch 3e. a = annealed hr = hot rolled ag = aged cd = cold drawn cw = cold worked qt = quenched & tempered Yield Strength : Comparison Grap hite/ Cera mics/ Semi cond Me tals / A ll o ys Compo sites/ fi b e rs Poly mers Yield strength, σ y (M Pa) P V C Hard to measure , since in tension, fracture usually occurs before yield.
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