It is important to distinguish between the different ways this is practiced:

Post‑kink load‑deflection curves from FE match the analytical prediction of Eq. (2) within 5 % across the entire range of (\delta/L) examined (0–0.35).

The LBK originates from a competition between the filament’s intrinsic curvature, which tends to keep the beam gently bent, and the compressive load, which drives the curvature to concentrate. Once (\Gamma) exceeds (\Gamma

: Enthusiasts often cite the rhythmic sounds (the "chug-chug" of the engine), the heat of the steam, and the tactile nature of heavy denim or oiled leather as primary turn-ons.