What are typical KIC values for structural materials?

High-strength steel (HSS): KIC = 40–80 MPa√m. Structural steel (mild): 100–200 MPa√m. 7075-T6 aluminium: 24–30 MPa√m. Ti-6Al-4V: 44–66 MPa√m. PMMA (acrylic): 0.7–1.6 MPa√m. Higher KIC means more damage-tolerant.

When does plane stress vs plane strain govern?

Plane strain (more conservative, lower Kc) applies when specimen thickness B ≥ 2.5(KIC/σy)². Thin plates may fail under plane stress (higher apparent toughness). Structural components thick enough for plane strain should use KIC for fracture prediction.

Plane Strain Fracture Toughness KIC Calculator

Calculate stress intensity factor K = Yσ√(πa) and compare with KIC for fracture prediction. Verify plane strain validity: B ≥ 2.5(KIC/σy)².

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the scenario you are assessing. Calculate stress intensity factor K = Yσ√(πa) and compare with KIC for fracture prediction. Verify plane strain validity: B ≥ 2.5(KIC/σy)². Use the fracture toughness kic result to inform your calculation.

Plane Strain Fracture Toughness KIC Calculator

How to Use

Frequently Asked Questions

What are typical KIC values for structural materials?

When does plane stress vs plane strain govern?