ASTM E399

ASTM E399 is a standard test method developed by ASTM International for measuring the fracture toughness of materials, particularly metals. Fracture toughness is a material's ability to resist crack propagation when under stress. This standard helps determine how likely a material is to break or fail under certain conditions, which is crucial for ensuring safety and reliability in engineering applications. By establishing consistent testing procedures, ASTM E399 allows engineers and manufacturers to compare materials and make informed decisions in construction, manufacturing, and other industries where material integrity is vital.