⚙️ The Chord Effect & Real Sideloads: Instead of an arbitrary lateral force input, this model computes physics-driven contact from three sources. 1. Gravity — the rod weight component perpendicular to the wellbore axis, proportional to inclination. 2. Bowstring — under tension, the rod is pulled like a bowstring against the inside of the DLS curve. 3. Mitchell Buckling — under compression beyond the Euler limit, helical buckling drives the rod radially against the wall.
Chord Effect: A loose centralizer lets the rod "shortcut" the curve as a straight chord, drastically reducing bending stress but concentrating all contact force at the centralizer body itself. The sagitta geometry quantifies this trade-off. Deflection uses fix-fix boundary conditions (PL³/192EI) appropriate for a segment pinned between hardware.