Carbon Nanofiber Composite Blade 2D: Stress & Strength Cross-Section

This is a 2D companion to the 3D Halpin-Tsai blade simulator, computed independently rather than flattened from the 3D scene. It renders a stereologically correct fiber-packing cross-section (tilted fibers become ellipses, exactly as a real polished cross-section would show), a bending-moment diagram for the cantilever spar, and a per-point bending-stress heatmap through the beam's thickness. It also adds a strength model the 3D version never had: the Kelly-Tyson short-fiber theory, which accounts for the finite length over which a nanofiber can pick up load through matrix shear before it either pulls out or snaps, producing a real safety factor against the wind-driven bending load rather than only a stiffness number.