GB/T 5482-2023 specifies the sample preparation, test procedures, result processing, and reporting requirements for the dynamic tear test of metallic materials. It is applicable to metallic materials or welded joints with a Rockwell hardness value less than 36 HRC. The standard focuses on determining the dynamic tear energy and shear fracture area percentage to characterize the tear resistance and fracture behavior of materials under high-speed loading. The test requires the use of a pendulum or drop-weight impact testing machine, equipped with specialized supports, impact blades, and computer-aided measurement devices. By subjecting the sample to a single impact fracture and accurately collecting energy data and fracture surface information, the standard provides a unified technical basis for the research and development, quality control, and engineering application selection of metallic materials.