Stress Concentration Factor Calculator

Find the peak stress at a geometric feature.

Maximum stress (MPa) 250

Formula: σ_max = Kt · σ_nominal

Step-by-step with your numbers:

1. Values used:

2. Stress concentration factor Kt = 2.5

3. Nominal stress = 100 MPa

5. Maximum stress = Stress concentration factor Kt x Nominal stress = 2.5 x 100 = 250MPa

Did we solve your problem today?

Holes, notches and fillets concentrate stress, raising it above the nominal value.

The math behind it

σ_max = Kt · σ_nominal. Kt depends on geometry — a sharp notch can triple the local stress.

Kt 2.5 on 100 MPa nominal → 250 MPa peak.

How do you reduce Kt?

Use generous fillet radii and avoid sharp corners.