Chapter_6_Mechanical_Properties_1_Compatibility_Mode_ -...

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1 INTRODUCTION TO MATERIALS SCIENCE & ENGINEERING 1 by Assoc. Professor Dr. Puteri Sri Melor bt. Megat Yusoff PSMMY Jan2010 So Far…in Part 1 Atomic Structure Atomic Bonding (nature of bonding) Atomic Arrangements Affect Mechanical Properties: PSMMY Jan2010 2 (crystal structures) Atomic Imperfections (defects) Atomic Movements (diffusion) ± Brittle ± Ductile ± Strength In Part 2… Controlling The Microstructure & Mechanical Properties of Materials Before: solid solution strengthening (alloy) Next: strain hardening PSMMY Jan2010 3 grain-size strengthening creating multiple phase materials dispersion strengthening age hardening phase transformation processing of materials Learning Outcomes Define engineering stress and engineering strain. State Hooke’s law, and note the conditions under PSMMY Jan2010 4 which it isvalid. Define Poisson’s ratio. Given an engineering stress-strain diagram, determine (a) the modulus of elasticity, (b) the yield strength (0.002 strain offset), (c) the tensile strength, and (d) estimate the percent elongation. Learning Outcomes For the tensile deformation of a ductile cylindrical specimen, describe changes in specimen profile to the poin of fractur PSMMY Jan2010 5 point of fracture. Compute ductility in terms of both percent elongation and percent reduction of area for a material that is loaded in tension to fracture. Give brief definitions of and the units for modulus of resilience and toughness (static). Learning Outcomes For a specimen being loaded in tension, given the applied load, the instantaneous cross-sectional dimensions a wel a origina and instantaneou PSMMY Jan2010 6 dimensions, as well as original and instantaneous lengths, be able to compute true stress and true strain values. Name the two most common hardness-testing techniques; note two differences between them.
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2 Learning Outcomes (a) Name and briefly describe the two different ii d t t i hd tt i th i d (b PSMMY Jan2010 7 microindentation hardness testing techniques, and (b) cite situations for which these techniques are generally used. Compute the working stress for a ductile material.
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This note was uploaded on 03/20/2010 for the course IMSE tb1073 taught by Professor Musharaf during the Spring '10 term at University of Malaya.

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Chapter_6_Mechanical_Properties_1_Compatibility_Mode_ -...

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