Standard Test Method for Measurement of Fracture Toughness (Includes all amendments and changes 12/2/2020).Translate name
STANDARD published on 1.9.2020
Designation standards: ASTM E1820-20b
Publication date standards: 1.9.2020
The number of pages: 65
Approximate weight : 195 g (0.43 lbs)
Country: American technical standard
Category: Technical standards ASTM
crack initiation, crack-tip opening displacement, CTOD, ductile fracture, elastic-plastic fracture toughness, fracture instability, J-integral, JIc, KJic, Jc, ?c, plane-strain fracture toughness, resistance curve, stable crack growth,, ICS Number Code 77.040.10 (Mechanical testing of metals)
|Significance and Use|
5.1ï¿½Assuming the presence of a preexisting, sharp, fatigue crack, the material fracture toughness values identified by this test method characterize its resistance to: 5.1.1ï¿½These 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.
5.1.2ï¿½These 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.
5.2ï¿½The following cautionary statements are based on some observations.
5.2.1ï¿½Particular 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.
5.2.2ï¿½The 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.
5.2.3ï¿½The values of ?1.1ï¿½This test method covers procedures and guidelines for the determination of fracture toughness of metallic materials using the following parameters: Note 1:ï¿½Until this version, 1.2ï¿½The 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.
1.2.1ï¿½Specimen 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:ï¿½Other standard methods for the determination of fracture toughness using the parameters 1.3ï¿½The 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.
1.4ï¿½This 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.
1.5ï¿½This 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.
|2. Referenced Documents|
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