1. ASTM E1820-11, Standard test method for measurement of fracture toughness. West Conshohocken, PA, USA. ASTM International; 2011.
2. BS 7448-1. Fracture mechanics toughness tests – Part 1: method for determination of KIc, critical CTOD and critical J values of metallic materials. London, UK. British Standard Institute; 2002.
3. ASTM E399-90, Standard test method for plane strain fracture toughness of metallic materials. West Conshohocken, PA, USA. ASTM International; 1997.
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