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sci.fracture-toughness-KIC-compact Calculator
Calculates fracture toughness K_IC from compact tension specimen load and crack length per ASTM E399: K_IC = P/(BW^0.5) × f(a/W). Plane strain fracture toughness K_IC is a material property — it requires specimen thickness B ≥ 2.5(K_IC/σ_y)².
Inputs
P N
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
B M
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
W M
Horizontal extent perpendicular to the length.
A M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
fracture toughness KIC (MPa√m)
Sample size or count used in the calculation.
a/W ratio
The proportional relationship between two quantities.
geometry factor f(a/W)
A dimensionless multiplier applied in the calculation.
KIC = P/(B√W)·f(a/W)
Reference formula or conversion factor shown for context.
validity check
A pass/fail verification against the applicable code, standard, or threshold.