ASTM E 561 : 2023
Current
The latest, up-to-date edition.
Standard Test Method for KR Curve Determination
Hardcopy , PDF
English
09-05-2023
Committee |
E 08
|
DocumentType |
Test Method
|
Pages |
18
|
PublisherName |
American Society for Testing and Materials
|
Status |
Current
|
Supersedes |
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
1.2Materials 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.
1.3Specimens of standard proportions are required, but size is variable, to be adjusted for yield strength and toughness of the materials.
1.4Only two of the many possible specimen types that could be used to develop KR curves are covered in this method.
1.5The 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.
1.6The 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.
1.7This 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.
1.8This 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.
ASTM E 647 : 2023 | Standard Test Method for Measurement of Fatigue Crack Growth Rates |
ASTM B 646 : 2019 | Standard Practice for Fracture Toughness Testing of Aluminum Alloys |
ASTM D 7779 : 2020 | Standard Test Method for Determination of Fracture Toughness of Graphite at Ambient Temperature |
ASTM B 645 : 2021 | Standard Practice for Linear-Elastic Plane-Strain Fracture Toughness Testing of Aluminum Alloys |
ASTM F 3439 : 2022 | Additive manufacturing of metals — Finished part properties — Orientation and location dependence of mechanical properties for metal powder bed fusion |
ASTM E 740/E740M : 2003 : R2016 | Standard Practice for Fracture Testing with Surface-Crack Tension Specimens |
ASTM E 1823 : 2021 | Standard Terminology Relating to Fatigue and Fracture Testing |
ASTM B 909 : 2021 : REV A | Standard Guide for Plane Strain Fracture Toughness Testing of Non-Stress Relieved Aluminum Products |
ASTM E 2472 : 2012 : R2018 : EDT 1 | Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions |
ASTM E 1823 : 2024 | Standard Terminology Relating to Fatigue and Fracture Testing |
ASTM E 1823 : 2024 : REV A | Standard Terminology Relating to Fatigue and Fracture Testing |
ASTM E 399 : 2024 | Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials |
ASTM E 1823 : 2024 : REV B | Standard Terminology Relating to Fatigue and Fracture Testing |
ASTM E 399 : 2023 | Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials |
ASTM E 1823 : 2021 | Standard Terminology Relating to Fatigue and Fracture Testing |
ASTM E 3076 : 2018 | Standard Practice for Determination of the Slope in the Linear Region of a Test Record |
ASTM E 4 : 2021 | Standard Practices for Force Calibration and Verification of Testing Machines |
ASTM E 1823 : 2024 : REV C | Standard Terminology Relating to Fatigue and Fracture Testing |
ASTM E 1823 : 2023 | Standard Terminology Relating to Fatigue and Fracture Testing |
ASTM E 399 : 2022 | Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials |
ASTM E 4 : 2024 | Standard Practices for Force Calibration and Verification of Testing Machines |
ASTM E 3076 : 2018 : EDT 1 | Standard Practice for Determination of the Slope in the Linear Region of a Test Record |
Access your standards online with a subscription
Features
-
Simple online access to standards, technical information and regulations.
-
Critical updates of standards and customisable alerts and notifications.
-
Multi-user online standards collection: secure, flexible and cost effective.