Stress Intensity Factor Calculator

Calculate stress intensity factor (K), critical crack size, and fracture toughness assessment for Mode I loading.

Far-field applied tensile stress.
MPa
Half the crack length for through crack, or depth for edge crack.
mm
Material fracture toughness. Steel: 50-150 MPa√m, Aluminum: 20-40 MPa√m.
MPa√m
Correction factor. 1.0 for infinite plate, 1.12 for edge crack.

Results

Stress Intensity KI-MPa√m
Critical Crack Size-mm
KI / KIC Ratio-
Safety Assessment-
References: Anderson — Fracture Mechanics Fundamentals; ASTM E399