3/8/2002, Friday Toughness. Fracture Modes Stress Field Around Crack Tip.

3/8/2002, Friday

Toughness

Fracture Modes

Stress Field Around Crack Tip

Stress Concentration

Crack Tip Stress Distribution

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σij =KI

2πrfij(θ)

Stress Intensity Factor, K

Fracture Toughness, KIC

Crack Tip Plastic Zone

Fracture Process Zone

Concrete

Polymer Fracture - Craze

Polymer Yielding

Atomistic fracture pattern at different loading rate

Low strain rate High strain rate

dislocation cleavage

H. Tan and W. Yang, Acta Mechanica Sinica

co-existence of dislocationsand cleavage embryo

Fiber Composite

Stress-Strain Curve