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MAE 20 mid-term study guide_Summer 2010

MAE 20 mid-term study guide_Summer 2010 - 7 The phenomena...

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MAE 20, Elements of Materials Science (Summer 2010) Mid-term Exam Study Guide 1. Differences between covalent, ionic, and metallic bonding, examples of materials. 2. Miller indices for directions and planes in a cubic system 3. The concept and calculation of the atomic packing fraction (APF) in bcc and fcc unit cells. 4. Defects in crystals: vacancies and dislocations (edge vs. screw), how does their concentration vary with temperature 5. Fick’s laws of diffusion (see example problems in the textbook) 6. Features of the Engineering Stress-Engineering strain curves. Why is a True Stress- True strain curve more reliable? Relationship between these two types of representations.
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Unformatted text preview: 7. The phenomena of slip through dislocation motion. Defining a slip system in terms of a slip plane and a slip direction. The concept of the Resolved Shear Stress (RSS). 8. Ductile vs. Brittle failure. What is the difference in appearance as determined through fractographic examination? The effect of cracks on failure in a material. The concept of Stress concentration (and Stress concentration factor) near inhomogeneities 9. Fatigue and creep failure: Definition, characteristics, experimental representation of fatigue failure (S-N curves). Ways to prevent fatigue failures....
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