L28MechII145s10

L28MechII145s10 - Lecture 28, spring 2009 ENGR 145,...

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Unformatted text preview: 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 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 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] 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 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 % 100 f l l EL l = Mechanical Properties of Metals [C&R 7.5] 4 Lecture 28, spring 2009...
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This note was uploaded on 01/30/2011 for the course EMSE 103 taught by Professor Ggh during the Spring '10 term at Case Western.

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L28MechII145s10 - Lecture 28, spring 2009 ENGR 145,...

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