ASTM E399 Standard Test Method

ASTM E399 is a standard test method used to measure the fracture toughness of materials, particularly metals, which indicates how well a material can resist crack propagation. This is crucial in assessing the safety and reliability of materials used in engineering and construction. The test involves creating a specific type of crack in a sample and applying stress until the crack grows. The results help engineers understand a material's performance under stress, ensuring that structures like bridges and buildings can withstand various forces without failure.