ASTM E561-23

5.1?The 5.2?For an untested geometry, the K_R curve can be matched with the applied-K curves (crack driving curves) to estimate the degree of stable crack extension and the conditions necessary to cause unstable crack propagation 5.2.1?To predict crack behavior and instability in a component, a family of applied-K curves is generated by calculating K as a function of crack size for the component using a series of force, displacement, or combined loading conditions. The K_R curve may be superimposed on the family of applied-K curves as shown in Fig. 1, with the origin of the FIG. 1 Schematic Representation of K_R curve and Applied 5.2.2?Conversely, the K_R curve can be shifted left or right in Fig. 1 to bring it into tangency with applied-K curve to determine the initial crack size that would cause crack instability under that loading condition.

1.1 This test method covers the determination of the resistance to fracture of metallic materials under Mode I loading at static rates using either of the following notched and precracked specimens: the middle-cracked tension M(T) specimen or the compact tension C(T) specimen. A 1.2?Materials that can be tested for 1.3?Specimens of standard proportions are required, but size is variable, to be adjusted for yield strength and toughness of the materials.

1.4?Only two of the many possible specimen types that could be used to develop 1.5?The test is applicable to conditions where a material exhibits slow, stable crack extension under increasing crack driving force, which may exist in relatively tough materials under plane stress crack tip conditions.

1.6?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.

1.7?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.

1.8?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.