jiangyu li, university of washington lecture 21 fracture mechanics mechanical behavior of materials...

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