Jiangyu Li, University of Washington
Lecture 21Fracture Mechanics
Mechanical Behavior of Materials Section 8.3-8.7
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Mechanics of Materials Lab
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Stress Intensity Factor: Tension
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Stress Intensity Factor: Bending
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Stress Intensity Factor: Circumferential Crack
-
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Stress Intensity Factor
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Superposition
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Superposition
-
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Energy Release Rate
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Plastic Zone
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K field
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Limitation of LEFM
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Example
Central cracka=10mmb=50mmt=5mmLarge hP=50 kNo=415 Mpa
Determine whether plane strain or LEFM apply, plastic zone.
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Effect of Thickness
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Load Displacement Curve
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Correlation with Strength
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Effect of Temperature and Rate
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Effect of Temperature and Rate
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Fracture Surface
cleavage Dimpled rupture
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Assignment
Mechanical Behavior of Materials
8.5, 8.41