ASTM E2472-12(2018)e1
Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions

Standard No.

ASTM E2472-12(2018)e1

Release Date

2018

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E2472-12(2018)e2

Latest

ASTM E2472-12(2018)e3

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), 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. 1.2 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). 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.

ASTM E2472-12(2018)e1 Referenced Document

• ASTM E1290 Standard Test Method for Crack-Tip Opening Displacement (CTOD) Fracture Toughness Measurement
• ASTM E1820 Standard Test Method for Measurement of Fracture Toughness
• ASTM E1823 Standard Terminology Relating to Fatigue and Fracture Testing
• ASTM E2309 Standard Practices for Verification of Displacement Measuring Systems and Devices Used in Material Testing Machines*， 2024-04-21 Update
• ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
• ASTM E4 Standard Practices for Force Verification of Testing Machines
• ASTM E561 Standard Practice for R-Curve Determination
• ASTM E647 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• ASTM E8/E8M Standard Test Methods for Tension Testing of Metallic Materials*， 2024-01-01 Update
• ISO 12135 Metallic materials - Unified method of test for the determination of quasistatic fracture toughness*， 2021-06-30 Update

ASTM E2472-12(2018)e1 history

• 2018 ASTM E2472-12(2018)e3 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
• 2018 ASTM E2472-12(2018)e2 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
• 2018 ASTM E2472-12(2018)e1 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
• 2018 ASTM E2472-12(2018) Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
• 2012 ASTM E2472-12e1 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
• 2012 ASTM E2472-12 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
• 2006 ASTM E2472-06e1 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
• 2006 ASTM E2472-06 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions