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ASTM E561

Standard Test Method for KR Curve Determination

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Organization: ASTM
Publication Date: 15 June 2020
Status: active
Page Count: 17
ICS Code (Mechanical testing of metals): 77.040.10
scope:

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 KR curve is a continuous record of toughness development (resistance to crack extension) in terms of KR plotted against crack extension in the specimen as a crack is driven under an increasing stress intensity factor, K. (1)2

Materials that can be tested for KR curve development are not limited by strength, thickness, or toughness, so long as specimens are of sufficient size to remain predominantly elastic to the effective crack extension value of interest.

Specimens of standard proportions are required, but size is variable, to be adjusted for yield strength and toughness of the materials.

Only two of the many possible specimen types that could be used to develop KR curves are covered in this method.

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.

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.

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.

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.

2 The boldface numbers in parentheses refer to the list of references at the end of this standard.

*A Summary of Changes section appears at the end of this standard

Document History

ASTM E561
June 15, 2020
Standard Test Method for KR Curve Determination
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...
July 15, 2019
Standard Test Method for KR Curve Determination
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...
July 15, 2019
Standard Test Method for KR Curve Determination
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...
December 1, 2015
Standard Test Method for KR Curve Determination
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...
October 15, 2015
Standard Test Method for KR Curve Determination
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...
November 1, 2010
Standard Test Method for K-R Curve Determination
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...
November 1, 2010
Standard Test Method for K-R Curve Determination
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...
November 1, 2010
Standard Test Method for K-R Curve Determination
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...
November 1, 2008
Standard Test Method for K-R Curve Determination
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...
November 1, 2008
Standard Test Method for K-R Curve Determination
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...
June 1, 2005
Standard Test Method for K-R Curve Determination
This test method covers the determination of the resistance to fracture of metallic materials under Mode I loading at static rates using any of the following notched and precracked specimens: the...
June 1, 2005
Standard Test Method for K-R Curve Determination
(Footnote *) This test method covers the determination of the resistance to fracture of metallic materials under Mode I loading at static rates using any of the following notched and precracked...
December 10, 1998
Standard Practice for R-Curve Determination
1. Scope 1.1 This practice covers the determination of resistance to fracturing of metallic materials by R-curves using either the center-cracked tension panel M(T), the compact specimen C(T), or the...
January 1, 1994
Standard Practice for R-Curve Determination
A description is not available for this item.
April 15, 1992
STANDARD PRACTICE FOR R-CURVE DETERMINATION
A description is not available for this item.
January 15, 1992
STANDARD PRACTICE FOR R-CURVE DETERMINATION
A description is not available for this item.
February 28, 1986
STANDARD PRACTICE FOR R-CURVE DETERMINATION
A description is not available for this item.
April 24, 1981
STANDARD PRACTICE FOR R-CURVE DETERMINATION
A description is not available for this item.

References

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