1. BS5762. Methods for crack opening displacement (COD) testing. London: British Standards Institution; 1979.
2. BS7448. Part 1: Method for determination of KIc, critical crack tip opening displacement (CTOD) and critical J values of fracture toughness for metallic materials under displacement controlled monotonic loading at quasistatic rates. London: British Standards Institution; 1991.
3. ASTM E1290-89, -02, -08. Standard test method for crack-tip opening displacement (CTOD) fracture toughness measurement. West Conshohocken: American Society for Testing and Materials; 1989, 2002, 2008.
4. WES1108. Standard test method for crack-tip opening displacement (CTOD) fracture toughness measurement. Tokyo: The Japan Welding Engineering Society; 1995.
5. ISO 12135. Unified method of test for the determination of quasistatic fracture toughness. Geneva: International Organization for Standardization; 2002.