AC LEC 19-09

AC LEC 19-09 - Lecture 19-Deformation Mechanisms in...

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Lecture 19-Deformation Mechanisms in Materials Theoretical Yield Stress Dislocation Slip Slip Systems Critical Resolved Shear Stress Deformation in Polymers Lack of Deformation in Ceramics Superplasticity in a Zr Alloy
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Mechanical Properties of Metals, Polymers, and Ceramics
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A Variety of Materials
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Tensile Properties of Metallic Alloys
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Tensile Properties of HDPE and LDPE LDPE has lower crystallinity than HDPE
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Amorphous Polymers
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Tensile Properties of Ceramics compressive loading ≠ tensile loading
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Ductility and Toughness
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Deformation Mechanisms in Metals
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Theoretical Yield Stress Shear strength of metals: Theoretical Strength ≈ 10 3 to 10 4 x Observed Strength How do we explain this?
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Dislocation Slip in Metals
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Visualization of Dislocation Slip 1
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Visualization of Dislocation Slip 2
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Deformation Mechanisms Two Major Mechanisms: Slip Twinning
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Slip in a Single Crystal Slip Line Slip Band
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Slip Bands Copper Zinc
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Slip: Close Packed Planes Slip is favored in Close Packed Planes higher slope in non-CP plane
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This note was uploaded on 02/27/2009 for the course MSE 150 taught by Professor Wittig during the Spring '07 term at Vanderbilt.

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AC LEC 19-09 - Lecture 19-Deformation Mechanisms in...

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