Parameters
Material-Environment System
Material-Environment Selection
Applied stress σ (MPa)
400 MPa
Crack half-length a (mm)
2.0 mm
Geometry factor F
1.12
Yield stress σ_y (MPa)
800 MPa
SCC Material Data (Auto-set)
KISCC (MPa√m)
25 MPa√m
KIC (MPa√m)
60 MPa√m
Paris coefficient A (×10⁻¹²)
1.0
Paris exponent n
2.5
Potential E (mV vs SHE)
-300 mV
pH
7.0
—
KI (MPa√m)
—
KISCC (MPa√m)
—
KI/KISCC Risk Ratio
—
Est. Fracture Life (h)
Pourbaix Diagram (Fe-system E-pH Chart)
Crack growth rate da/dt vs KI
Theory
Stress intensity factor: $K_I = F \cdot \sigma \sqrt{\pi a}$
SCC growth rate (Paris-type): $\dfrac{da}{dt} = A(K_I - K_{ISCC})^n$
Fracture life: $t_f = \displaystyle\int_{a_0}^{a_c} \dfrac{da}{A(K_I(a)-K_{ISCC})^n}$
Hydrogen embrittlement index: $HEI = (\sigma_{air} - \sigma_{H_2}) / \sigma_{air}$
CAE Integration: Compare KI distribution from FEM stress analysis with the KISCC threshold in this tool to identify SCC risk locations. Useful for pre-processing design in Abaqus/Fracture Mechanics plugins and LS-DYNA crack propagation analysis.