10.26mechproperties - Click to edit Master subtitle style...

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Unformatted text preview: Click to edit Master subtitle style E45 Lecture 10/26/09 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 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 . 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. Youngs Moduli: Comparison 109 Pa . 8 . 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 Wood( gra in) AFRE( fib ers) * CF RE * GF RE * Glass fibers only Carb on fibers only A ramid fibers only Epoxy only . 4 . 8 2 4 6 1 20 40 60 80 1 2 0 6 0 8 0 12 00 4 0 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 E T C FRE( fibe rs) * G FRE( fiber s)* G FRE(|| fibers)* A FRE(|| fibers)* C FRE(|| fibers)* 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, y (M Pa) P V C Hard to measure , since in tension, fracture usually occurs before yield....
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This note was uploaded on 11/16/2009 for the course ENGIN 45 taught by Professor Devine during the Fall '07 term at University of California, Berkeley.

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10.26mechproperties - Click to edit Master subtitle style...

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