Calculate theoretical stress concentration factor (K_t) for notches, holes, fillets, grooves, shoulders. Instant max stress and nominal stress comparison.
Featured: Notches • Holes • Fillets • Grooves • Peterson Charts
K_t variation with r/d ratio
Peterson's Stress Concentration Factors
Enter parameters to see results
Hole in plate: K_t ≈ 3
Sharp notch: K_t > 5
Fillet r/d = 0.1: K_t ≈ 2.5–3.0
Increase fillet radius
Use smoother transitions
Apply surface treatment