Lifting Lug / Padeye Pin-Hole Check
Checks an engineered lifting lug or padeye against all four ASME BTH-1 pin-hole failure modes -- bearing, net-section tension, and double-plane shear tear-out -- and reports the governing capacity and DCR. The four modes trade off through hole placement; a lug sized for gross tension alone can tear out at the pin.
Formula and source
bearing = 1.25 Fy Dp t / Nd; net tension = Fu (w - Dh) t / Nd; shear tear-out = 0.70 Fu (2 t (a + Dp/2 - Dh/2)) / Nd; governing = min; DCR = load / governing.
The ASME BTH-1 Section 3-3.3 pin-connected-plate (lifting lug / padeye) strength checks, by name.
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