{"id":1433,"count":7,"description":"Metallic materials \u2013 Unified test method for the determination of resistance to quasistatic fracture\r\nThe Standard specifies methods for determining fracture toughness in terms of K, \u03b4, J and R-curves for homogeneous metallic materials subjected to quasistatic loading. The samples are notched, precracked for fatigue and tested under slowly increasing displacement. 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 some cases in the testing of ferritic materials, unstable crack extension may occur by splitting or ductile crack initiation and growth, interrupted by splitting extension. Fracture resistance in crack arrest is not covered by this document. In cases where cracks grow stably under ductile tearing conditions, a strength curve describing fracture toughness as a function of crack extent is measured. In most cases, the statistical variability of the results is moderate and reporting the average of three or more test results is acceptable. In cases of cleavage fracture of ferritic materials in the ductile to brittle transition region, the variability can be large and additional tests may be necessary to quantify the statistical variability. Special analysis requirements and analysis procedures are necessary when testing welds and these are described in ISO 15653 which is complementary to this document.\r\n\r\nWhen fracture occurs by cleavage or when cleavage is preceded by limited ductile crack extension, it may be useful to establish the reference temperature for the material by performing tests and analysis in accordance with ASTM E1921.","link":"https:\/\/techlabsystems.com\/eng\/iso\/1-2-3\/iso-12135\/","name":"ISO 12135","slug":"iso-12135","taxonomy":"iso","parent":1395,"meta":[],"acf":[],"_links":{"self":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/iso\/1433","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/iso"}],"about":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/taxonomies\/iso"}],"up":[{"embeddable":true,"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/iso\/1395"}],"wp:post_type":[{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/product?iso=1433"},{"href":"https:\/\/techlabsystems.com\/eng\/wp-json\/wp\/v2\/normas?iso=1433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}