The Charpy Impact Test measures a material's toughness—specifically its ability to absorb energy during a high-rate impact. A weighted pendulum strikes a notched specimen, and the energy absorbed during the fracture is recorded. This test is critical for determining the Ductile-to-Brittle Transition Temperature (DBTT). For engineers building infrastructure in cold climates, Charpy data ensures that the steel will not undergo a sudden brittle failure when subjected to shock loads at low temperatures.