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L28MechII145s10 - Lecture 28 Mechanical Properties II...

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Lecture 28, spring 2009 ENGR 145, Chemistry of Materials Case Western Reserve University Reading assignment : C&R §7.6, 7.8-7.10; 7.13-7.14; 8.17-8.18 Learning objectives: Determine mechanical properties related to deformation and fracture from a tensile test Yield strength Tensile strength Strain to failure Modulus of toughness Recognize distinctive aspects of polymers’ mechanical behavior: Temperature dependence w.r.t. T g Deformation mechanism Stress-strain curve: differences from metals & ceramics Dependence on crystallinity and molecular weight Lecture 28: Mechanical Properties II — Plastic Deformation & Fracture 1
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Lecture 28, spring 2009 ENGR 145, Chemistry of Materials Case Western Reserve University Plastic behavior: some strain remains after removal of load Mechanical Properties of Metals [C&R §7.5] 0.2% yield strength ( 0.002=0.2%) Yield strength: stress that will result in a specified residual strain 2 C&R Fig. 7.17 C&R Fig. 7.10
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Lecture 28, spring 2009 ENGR 145, Chemistry of Materials Case Western Reserve University C&R Fig. 7.11 Plastic behavior in a tensile test Yielding Tensile strength (a.k.a. ultimate tensile strength) Necking Fracture Mechanical Properties of Metals [C&R §7.5] 3
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Lecture 28, spring 2009 ENGR 145, Chemistry of Materials Case Western Reserve University C&R Fig. 7.13 (Relatively) brittle vs. ductile behavior A measure of ductility: % elongation to failure 0 0 % 100 f l l EL l = Mechanical Properties of Metals [C&R §7.5] 4
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Lecture 28, spring 2009 ENGR 145, Chemistry of Materials Case Western Reserve University Mechanical Properties of Metals — Plastic Behavior 5 c.f. C&R Tables 7.1 & 7.2
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