// multi-utility computation suite · offline · instant · precise
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sci.fracture-toughness-SIF Calculator
Calculates stress intensity factor K from applied stress, crack geometry, and boundary conditions, and compares to K_IC to determine safety factor against fracture. Safety factor = K_IC/K_applied — in damage-tolerant design, components are inspected and retired before K reaches K_IC.
Inputs
Applied Stress Mpa
Internal force per unit area (Pa or MPa). Must stay below yield strength in service.
Crack Length Mm
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Geometry Factor Y
A multiplier applied in the calculation.
Kic Mpa Sqrt M
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.
safety factor KIc/KI
A dimensionless multiplier applied in the calculation.
critical crack length (mm)
The computed linear length.
fracture?
Reference formula or conversion factor shown for context.
KI = Y·σ·√(πa)
Reference formula or conversion factor shown for context.
steel KIc range
The difference between the maximum and minimum values.