ASTM International - ASTM E561-19e1

Standard Test Method for K R Curve Determination

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Organization: ASTM International
Publication Date: 15 July 2019
Status: active
Page Count: 16
ICS Code (Mechanical testing of metals): 77.040.10
significance And Use:

5.1 The KR curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as... View More

scope:

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 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

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.

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 KR curves are covered in this method.

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.

Document History

June 15, 2020
Standard Test Method for KR Curve Determination
5.1 The KR curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a...
July 15, 2019
Standard Test Method for KR Curve Determination
5.1 The KR curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a...
ASTM E561-19e1
July 15, 2019
Standard Test Method for KR Curve Determination
5.1 The KR curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a...
December 1, 2015
Standard Test Method for KR Curve Determination
5.1 The KR curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a...
October 15, 2015
Standard Test Method for KR Curve Determination
5.1 The KR curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a...
November 1, 2010
Standard Test Method for K-R Curve Determination
The K-R curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a fatigue...
November 1, 2010
Standard Test Method for K-R Curve Determination
The K-R curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a fatigue...
November 1, 2010
Standard Test Method for K-R Curve Determination
5.1 The K-R curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a...
November 1, 2008
Standard Test Method forK-R Curve Determination
The K-R curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a fatigue...
November 1, 2008
Standard Test Method forK-R Curve Determination
The K-R curve characterizes the resistance to fracture of materials during slow, stable crack extension and results from the growth of the plastic zone ahead of the crack as it extends from a fatigue...
June 1, 2005
Standard Test Method for K-R Curve Determination
1.1 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 forK-R Curve Determination
1.1 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...
December 10, 1998
Standard Practice for R-Curve Determination
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...
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