ASTM E 2472 : 2012 : R2018 : EDT 4
Current
The latest, up-to-date edition.
Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
Hardcopy , PDF
English
01-11-2018
Committee |
E 08
|
DocumentType |
Test Method
|
Pages |
26
|
ProductNote |
ε4 NOTE—Section 3.2.12 was editorially corrected in August 2024.
|
PublisherName |
American Society for Testing and Materials
|
Status |
Current
|
Supersedes |
1.1This standard covers the determination of the resistance to stable crack extension in metallic materials in terms of the critical crack-tip-opening angle (CTOA), ψc and/or the crack-opening displacement (COD), δ5 resistance curve (1).2 This method applies specifically to fatigue pre-cracked specimens that exhibit low constraint (crack-size-to-thickness and un-cracked ligament-to-thickness ratios greater than or equal to 4) and that are tested under slowly increasing remote applied displacement. The test specimens are the compact, C(T), and middle-crack-tension, M(T), specimens. The fracture resistance determined in accordance with this standard is measured as ψc (critical CTOA value) and/or δ5 (critical COD resistance curve) as a function of crack extension. Both fracture resistance parameters are characterized using either a single-specimen or multiple-specimen procedures. These fracture quantities are determined under the opening mode (Mode I) of loading. Influences of environment and rapid loading rates are not covered in this standard, but the user must be aware of the effects that the loading rate and laboratory environment may have on the fracture behavior of the material.
1.2Materials that are evaluated by this standard are not limited by strength, thickness, or toughness, if the crack-size-to-thickness (a/B) ratio and the ligament-to-thickness (b/B) ratio are greater than or equal to 4, which ensures relatively low and similar global crack-front constraint for both the C(T) and M(T) specimens (2, 3).
1.3The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4This 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.
1.5This 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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ASTM E 1823 : 2024 : REV C | 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 399 : 2023 | Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials |
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