aerodynamic load

Why Do Heavy Duty Garage Door Hinges Fail Under High Winds and Extreme Cold? Reference Standard: ASTM A653 (Standard Specification for Steel Sheet, Zinc-Coated by the Hot-Dip Process) and ASTM E23 (Standard Test Methods for Notched Bar Impact Testing of Metallic Materials). Short Answer Garage door hinges fail in severe conditions due to a combination of aerodynamic wind loading and metallurgical flaws. High-velocity winds induce massive torsional stress that physically twists thin-gauge steel, while sub-zero temperatures push inferior alloys past their ductile-to-brittle transition point, causing sudden cleavage fracture. Furthermore, rough stamping processes create microscopic edge tears that act as stress magnifiers, rapidly accelerating structural collapse. Torsional Rigidity Collapse: The High-Wind … 続きを読む