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This document specifies methods for determining fracture toughness in terms of K, δ, J and R-curves for homogeneous metallic materials subjected to quasistatic loading. Specimens are notched, precracked by fatigue and tested under slowly increasing displacement. The fracture toughness is determined for individual specimens at or after the onset of ductile crack extension or at the onset of ductile crack instability or unstable crack extension. In cases where cracks grow in a stable manner under ductile tearing conditions, a resistance curve describing fracture toughness as a function of crack extension is measured. In some cases in the testing of ferritic materials, unstable crack extension can occur by cleavage or ductile crack initiation and growth, interrupted by cleavage extension. The fracture toughness at crack arrest is not covered by this document.
Special testing requirements and analysis procedures are necessary when testing weldments, and these are described in ISO 15653 which is complementary to this document. Statistical variability of the results strongly depends on the fracture type, for instance, fracture toughness associated with cleavage fracture in ferritic steels can show large variation. For applications that require high reliability, a statistical approach can be used to quantify the variability in fracture toughness in the ductile-to-brittle transition region, such as that given in ASTM E1921. However, it is not the purpose of this document to specify the number of tests to be carried out nor how the results of the tests are to be applied or interpreted.
There is a need adopt this standard as EN ISO because it is related to EN ISO 15653:2018. CTOD equation being applied in both standards should be harmonised.
ISO 15653:2018 has been revised while refering to ISO 12135:2021 for calculating CTOD.
The integration of Annexes:
- an Annex to deal with dynamic fracture toughness testing;
- Annex to determine fracture toughness when it is dominated by cleavage (in ferritic and bainitic steels)
The projects are related to the construction line and data spacing when conducting J/CTOD R-curve testing.
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