ASTM E2472

Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions

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Organization: ASTM
Publication Date: 1 July 2012
Status: active
Page Count: 26
ICS Code (Mechanical testing of metals): 77.040.10
scope:

This 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 crackopening 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 uncracked 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 singlespecimen 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.

Materials that are evaluated by this standard are not limited by strength, thickness, or toughness, if the crack-sizeto- 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).

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.

 

Document History

ASTM E2472
July 1, 2012
Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
This 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 crackopening...
July 1, 2012
Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
This 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 crackopening...
July 1, 2012
Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
This 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 crackopening...
June 15, 2006
Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
This standard covers the determination of the resistance to stable crack extension in metallic materials in terms of the critical crack-tip-opening angle (CTOAc), Ψc and/or the crack-opening...
June 15, 2006
Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
This standard covers the determination of the resistance to stable crack extension in metallic materials in terms of the critical crack-tip-opening angle (CTOAc), Ψc and/or the crack-opening...

References

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