1. ASTM E 1820-99. Standard test method for fracture toughness. West Conshohocken: American Society for Testing and Materials (ASTM); 1997
2. ISO 12135. Metallic materials––unified method of test for the determination of quasistatic fracture toughness. International Standard Organisation (ISO), in press
3. BS 7448, Part 1. Fracture mechanics toughness tests––method for determination of KIc, critical CTOD and critical J values of metallic materials. London: British Standards Institution; 1991
4. ASTM E 1921–97. Standard Test method for determination of reference temperature, T0, for ferritic steels in the transition range. West Conshohocken: American Society for Testing and Materials (ASTM); 1997
5. ESIS P1-92. ESIS reommendations for determining the fracture resistance of ductile materials. European Stuctural Integrity Society; 1992