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sci.fracture-mechanics-SIF-KI Calculator
Calculates mode I stress intensity factor K_I = σ√(πa) × F(a/W) for a through crack in a finite plate, and checks against fracture toughness K_IC. When K_I ≥ K_IC, brittle fracture initiates — K_IC for A533B reactor steel = 150–200 MPa√m; for soda-lime glass = 0.7 MPa√m.
Inputs
Sigma Mpa
Internal force per unit area (Pa or MPa). Must stay below yield strength in service.
A Mm
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Y Factor
A multiplier applied in the calculation.
Kic Mpa Sqrtm
Reference formula or conversion factor shown for context.
Results
stress intensity factor KI (MPa√m)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
fracture safety factor KIc/KI
A dimensionless multiplier applied in the calculation.
critical crack length 2ac (mm)
The computed linear length.
KI = Y·σ·√(πa)
Reference formula or conversion factor shown for context.
fracture status
Current state of the system, process, or metric — typically pass/fail, healthy/warning/critical, or a descriptive classification.
typical KIc (MPa√m)
Reference formula or conversion factor shown for context.