Bending and forming are at the core of how flat metal becomes aircraft skins, car panels, electronics enclosures, HVAC ducts, and structural brackets. It looks simple. It’s not. When we bend sheet metal, we’re permanently deforming it past its yield strength — meaning the material undergoes plastic deformation and won’t spring back fully to its original shape. But it will spring back a little. That’s called springback, and compensating for it is one of the biggest precision challenges in fabrication. Key mechanics behind bending and forming: • Elastic vs. Plastic Deformation – Metal first deforms elastically (temporary), then plastically (permanent). The transition happens at the yield strength. • Neutral Axis Shift – The inside of the bend compresses, the outside stretches. The neutral axis (zero strain layer) shifts toward the inside radius during bending. • K-Factor – A ratio that describes the neutral axis location relative to thickness. Critical for calculating flat pattern len...