Jiangyu Li, University of Washington

Lecture 21Fracture Mechanics

Mechanical Behavior of Materials Section 8.3-8.7

Jiangyu LiUniversity of Washington

Mechanics of Materials Lab

Jiangyu Li, University of Washington

Stress Intensity Factor: Tension

Jiangyu Li, University of Washington

Stress Intensity Factor: Bending

Jiangyu Li, University of Washington

Stress Intensity Factor: Circumferential Crack

-

Jiangyu Li, University of Washington

Stress Intensity Factor

Jiangyu Li, University of Washington

Superposition

Jiangyu Li, University of Washington

Superposition

-

Jiangyu Li, University of Washington

Energy Release Rate

Jiangyu Li, University of Washington

Plastic Zone

Jiangyu Li, University of Washington

K field

Jiangyu Li, University of Washington

Limitation of LEFM

Jiangyu Li, University of Washington

Example

Central cracka=10mmb=50mmt=5mmLarge hP=50 kNo=415 Mpa

Determine whether plane strain or LEFM apply, plastic zone.

Jiangyu Li, University of Washington

Effect of Thickness

Jiangyu Li, University of Washington

Load Displacement Curve

Jiangyu Li, University of Washington

Correlation with Strength

Jiangyu Li, University of Washington

Effect of Temperature and Rate

Jiangyu Li, University of Washington

Effect of Temperature and Rate

Jiangyu Li, University of Washington

Fracture Surface

cleavage Dimpled rupture

Jiangyu Li, University of Washington

Assignment

Mechanical Behavior of Materials

8.5, 8.41