E452011Lecture_3 - Chapter 7: Mechanical Properties ISSUES...

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Chapter 7 - 1 ISSUES TO ADDRESS. .. Stress and strain : What are they and why are they used instead of load and deformation? Elastic behavior: When loads are small, how much deformation occurs? What materials deform least? Plastic behavior: At what point does permanent deformation occur? What materials are most resistant to permanent deformation? Hardness : How to measure Chapter 7: Mechanical Properties
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Chapter 7 - Homework Problems in CR: 7.2, 7.3, 7.4, 7.11, 7.12, 7.15, 7.34 Due: 5PM September 9, 2009
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Chapter 7 - Mechanical Properties are critical to the performance of most engineering structures. Components of engineering structure need to resist fracture and deformation (shape change)
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Chapter 7 - Structure - Properties at 10,000X InGaN SQW LED Stresses in layers of dissimilar materials
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Chapter 7 - Lithium-Ion Batteries for Electronics and Electric Vehicles Stresses in cathode Li + + e - + FePO 4 <=> LiFePO 4 Stresses in anode Graphite(Li) -> Gr + Li + + e-
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Chapter 7 - Mechanical Properties are critical to the performance of most engineering structures. Components of engineering structure need to resist fracture and deformation (shape change) Mechanical Tests need to replicate service conditions Mode of loading (e.g.,tensile, compressive, shear) Rate of loading Time dependency: constant, monotonic, cyclic Temperature Environment
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Chapter 7 - Standard Tests Mechanical properties are evaluated using a number of standardized tests so that results obtained by different laboratories and individuals on different materials can be compared
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Chapter 7 - Procedure for Evaluating Mechanical Properties Structural engineers conduct a stress analysis to determine the type and magnitude of the stresses that the component will experience Materials engineers will then produce and fabricate a material that can resist the imposed stresses. This generally requires an understanding of the influence of a material’s composition and microstructure on its mechanical properties Oftentimes a combination of mechanical properties are required e.g., strength and ductility.
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Chapter 7 - 9 Stress-Strain Testing • Typical tensile specimen Adapted from Fig. 7.2, Callister & Rethwisch 3e. gauge length
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Chapter 7 - 10 Stress-Strain Testing • Typical tensile test machine Adapted from Fig. 7.3, (Fig. 7.3 is taken from H.W. Hayden, W.G. Moffatt, and J. Wulff,
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This note was uploaded on 09/14/2011 for the course MCB 58180 taught by Professor Kuriyan during the Spring '11 term at University of California, Berkeley.

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E452011Lecture_3 - Chapter 7: Mechanical Properties ISSUES...

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