ASTM-E2472 2018

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E2472-12(2018)e2 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions

Published By	Publication Date	Number of Pages
ASTM	2018

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Categories: 77.040.10 - Mechanical testing of metals, ASTM

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Description

ASTM E2472-12-e2-Reapproved2018

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

ASTM E2472

Scope

1.1 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), ψ_c 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 ψ_c (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.

1.2 Materials 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).

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

1.4 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.

1.5 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.

Keywords

crack-opening displacement (COD); crack-tip-opening angle, CTOA; crack-tip-opening displacement, CTOD; critical CTOA (ψc); δ5 resistance curve; ductile fracture; elastic-plastic fracture; fracture instability; low-constraint specimens; stable crack extension;

ICS Code

ICS Number Code 77.040.10 (Mechanical testing of metals)

DOI: 10.1520/E2472-12R18E02

Additional information

Standard Title	E2472-12(2018)e2 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
Published Code	ASTM
Publication Date	2018
ICS Codes	77.040.10 - Mechanical testing of metals