Geometric stress concentration for a grooved shaft in bending
Geometric stress concentration factor Kt = A(r/d)^b for a grooved shaft loaded in bending, from chart-fit coefficients A, b keyed on the D/d ratio (r/d clamped to 0.1 above its 0.3 validity limit, as in the legacy page).
Geometric stress concentration, Kₜ1.91
Coefficient, A0.94681
Coefficient, b-0.30582
Method & references
- Kt = A(r/d)^b for a grooved shaft in bending. Valid for r/d ≤ 0.3.
The computation is a literal port of the original client-side JavaScript from /calculators/e1_3b.htm. Results are verified equal to the original by an automated golden-master test. No formula has been re-derived or “improved”.