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ASTM E399-20a
Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials (Includes all amendments And changes 7/11/2022).
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STANDARD published on 1.12.2020
The information about the standard:
Designation standards: ASTM E399-20a
Note: WITHDRAWN
Publication date standards: 1.12.2020
SKU: NS-1016231
The number of pages: 38
Approximate weight : 114 g (0.25 lbs)
Country: American technical standard
Category: Technical standards ASTM
The category - similar standards:
Annotation of standard text ASTM E399-20a :
Keywords:
ICS Number Code 77.040.10 (Mechanical testing of metals)
Additional information
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5.1 The property 5.1.1 Variation in the value of KIc can be expected within the allowable range of specimen proportions, a/W and W/B. KIc may also be expected to rise with increasing ligament size. Notwithstanding these variations, however, KIc is believed to represent a lower limiting value of fracture toughness (for 2 % apparent crack extension) in the environment and at the speed and temperature of the test. 5.1.2 Lower values of 5.1.3 The value of 5.1.4 Cyclic forces can cause crack extension at KI values less than 5.1.5 Plane-strain fracture toughness testing is unusual in that there can be no advance assurance that a valid KIc will be determined in a particular test. Therefore, compliance with the specified validity criteria of this test method is essential. 5.1.6 Residual stresses can adversely affect the indicated K5.2 This test method can serve the following purposes: 5.2.1 In research and development, to establish in quantitative terms significant to service performance, the effects of metallurgical variables such as composition or heat treatment, or of fabricating operations such as welding or forming, on the fracture toughness of new or existing materials. 5.2.2 In service evaluation, to establish the suitability of a material for a specific application for which the stress conditions are prescribed and for which maximum flaw sizes can be established with confidence. FIG.
2 DoubleCantilever Clip-In Displacement Gage Showing
Mounting by Means of Integral Knife Edges 5.2.3 For specifications of acceptance and manufacturing quality control, but only when there is a sound basis for specifying minimum 1.1?This test method covers the determination of fracture toughness (1.1.1?The KIc test procedure is described in the main body of this test standard and is a mandatory part of the testing and results reporting procedure for this test method. The 1.1.2?The KIsi test procedure is described in Appendix X1 and is an optional part of this test method. The KIsi test procedure is based on a fixed amount of crack extension of 0.5 mm, and as a result, Note 1:?Plane-strain fracture toughness tests of materials thinner than 1.6 mm (0.063 in.) that are sufficiently brittle (see 7.1) can be made using other types of specimens 1.2?This test method is divided into two parts. The first part gives general recommendations and requirements for testing and includes specific requirements for the KIc test procedure. The second part consists of Annexes that give specific information on displacement gage and loading fixture design, special requirements for individual specimen configurations, and detailed procedures for fatigue precracking. Additional annexes are provided that give specific procedures for beryllium and rapid-force testing, and the 1.3?General information and requirements common to all specimen configurations:
1.4?Specific requirements related to test apparatus:
1.5?Specific requirements related to individual specimen configurations:
1.6?Specific requirements related to special test procedures:
1.7?The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.8?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. 1.9?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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