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ASTM E1820-20ae1
Standard Test Method for Measurement of Fracture Toughness (Includes all amendments And changes 11/23/2020).
Přeložit název
NORMA vydána dne 1.6.2020
Informace o normě:
Označení normy: ASTM E1820-20ae1
Poznámka: NEPLATNÁ
Datum vydání normy: 1.6.2020
Kód zboží: NS-1001409
Počet stran: 65
Přibližná hmotnost: 195 g (0.43 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM E1820-20ae1 :
Keywords:
crack initiation, crack-tip opening displacement, CTOD, ductile fracture, elastic-plastic fracture toughness, fracture instability, J-integral, JIc, KJic, Jc, deltac, plane-strain fracture toughness, resistance curve, stable crack growth,, ICS Number Code 77.040.10 (Mechanical testing of metals)
Doplňující informace
| Significance and Use | ||||||||||||||||||||
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5.1 Assuming the presence of a preexisting, sharp, fatigue crack, the material fracture toughness values identified by this test method characterize its resistance to: 5.1.1 These fracture toughness values may serve as a basis for material comparison, selection, and quality assurance. Fracture toughness can be used to rank materials within a similar yield strength range. 5.1.2 These fracture toughness values may serve as a basis for structural flaw tolerance assessment. Awareness of differences that may exist between laboratory test and field conditions is required to make proper flaw tolerance assessment. 5.2 The following cautionary statements are based on some observations. 5.2.1 Particular care must be exercised in applying to structural flaw tolerance assessment the fracture toughness value associated with fracture after some stable tearing has occurred. This response is characteristic of ferritic steel in the transition regime. This response is especially sensitive to material inhomogeneity and to constraint variations that may be induced by planar geometry, thickness differences, mode of loading, and structural details. 5.2.2 The J-R curve from bend-type specimens recommended by this test method (SE(B), C(T), and DC(T)) has been observed to be conservative with respect to results from tensile loading configurations. 5.2.3 The values of δc, δ1.1 This test method covers procedures and guidelines for the determination of fracture toughness of metallic materials using the following parameters: K, J, and CTOD (δ). Toughness can be measured in the Note 1: Until this version, KIc could be evaluated using this test method as well as by using Test Method E399. To avoid duplication, the evaluation of 1.2 The recommended specimens are single-edge bend, [SE(B)], compact, [C(T)], and disk-shaped compact, [DC(T)]. All specimens contain notches that are sharpened with fatigue cracks. 1.2.1 Specimen dimensional (size) requirements vary according to the fracture toughness analysis applied. The guidelines are established through consideration of material toughness, material flow strength, and the individual qualification requirements of the toughness value per values sought. Note 2: Other standard methods for the determination of
fracture toughness using the parameters K,
J, and CTOD are contained in Test Methods E399, E1290, and E1921. This test method was developed to
provide a common method for determining all applicable toughness
parameters from a single test.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||||||||||||
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