ASTM E647-23
Standard Test Method for Measurement of Fatigue Crack Growth Rates

Standard No.

ASTM E647-23

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E647-23a

Latest

ASTM E647-23b

Scope

1.1 This test method2 covers the determination of fatigue crack growth rates from near-threshold (see region I in Fig. 1) to Kmax controlled instability (see region III in Fig. 1.) Results are expressed in terms of the crack-tip stress-intensity factor range (∆K), defined by the theory of linear elasticity. 1.2 Several different test procedures are provided, the optimum test procedure being primarily dependent on the magnitude of the fatigue crack growth rate to be measured. 1.3 Materials that can be tested by this test method are not limited by thickness or by strength so long as specimens are of sufficient thickness to preclude buckling and of sufficient planar size to remain predominantly elastic during testing. 1.4 A range of specimen sizes with proportional planar dimensions is provided, but size is variable to be adjusted for yield strength and applied force. Specimen thickness may be varied independent of planar size. 1.5 The details of the various specimens and test configurations are shown in Annex A1 – Annex A3. Specimen configurations other than those contained in this method may be used provided that well-established stress-intensity factor calibrations are available and that specimens are of sufficient planar size to remain predominantly elastic during testing. 1.6 Residual stress and crack closure may significantly influence the fatigue crack growth rate data, particularly at low stress-intensity factors and low force ratios, although such variables are not incorporated into the computation of ∆K. 1.7 Values stated in SI units are to be regarded as the standard. Values given in parentheses are for information only. 1.8 This test method is divided into two main parts. The first part gives general information concerning the recommendations and requirements for fatigue crack growth rate testing. The second part is composed of annexes that describe the special requirements for various specimen configurations, special requirements for testing in aqueous environments, and procedures for non-visual crack size determination. In addition, there are appendices that cover techniques for calculating da/dN, determining fatigue crack opening force, and guidelines for measuring the growth of small fatigue cracks. General information and requirements common to all specimen types are listed as follows: Section Referenced Documents 2 Terminology 3 Summary of Use 4 Significance and Use 5 Apparatus 6 Specimen Configuration, Size, and Preparation 7 Procedure 8 Calculations and Interpretation of Results 9 Report 10 Precision and Bias 11 Special Requirements for Testing in Aqueous Environments Annex A4 Guidelines for Use of Compliance to Determine Crack Size Annex A5 Guidelines for Electric Potential Difference Determination of Crack Size Annex A6 Recommended Data Reduction Techniques Appendix X1 Recommended Practice for Determination of Fatigue Crack Opening Force from Compliance Appendix X2 Guidelines for Measuring the Growth Rates of Small Fatigue Cracks Appendix X3 Recommended Practice for Determination of ACR-Based Stress-Intensity Factor Range Appendix X4 1.9 Special requirements for the various specimen configurations appear in the following order: The Compact Specimen Annex A1 The Middle Tension Specimen Annex A2 The Eccentrically-Loaded Single Edge Crack Tension Specimen Annex A3 1.10 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. 1.11 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. 1 This test method is under the jurisdiction of ASTM Committee E08 on Fatigue and Fracture and is the direct responsibility of Subcommittee E08.06 on Crack Growth Behavior. Current edition approved Feb. 1, 2023. Published April 2023. Originally approved in 1978. Last previous approved in 2022 as E647 – 22b. DOI: 10.1520/ E0647-23. 2 For additional information on this test method see RR: E24 – 1001. Available from ASTM Headquarters, 100 Barr Harbor Drive, West Conshohocken, PA 19428. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 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. 1 2. Referenced Documents

ASTM E647-23 Referenced Document

• ASTM E1012 Standard Practice for Verification of Specimen Alignment Under Tensile Loading
• ASTM E1820 Standard Test Method for Measurement of Fracture Toughness
• ASTM E1823 Standard Terminology Relating to Fatigue and Fracture Testing
• ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
• ASTM E4 Standard Practices for Force Verification of Testing Machines
• ASTM E467 Standard Practice for Verification of Constant Amplitude Dynamic Forces in an Axial Fatigue Testing System
• ASTM E561 Standard Practice for R-Curve Determination
• ASTM E6 Standard Terminology Relating to Methods of Mechanical Testing
• ASTM E8/E8M Standard Test Methods for Tension Testing of Metallic Materials*， 2024-01-01 Update

ASTM E647-23 history

• 2023 ASTM E647-23b Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2023 ASTM E647-23a Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2023 ASTM E647-23 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2022 ASTM E647-22b Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2022 ASTM E647-22a Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2022 ASTM E647-22 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2015 ASTM E647-15e1 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2015 ASTM E647-15 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2013 ASTM E647-13ae1 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2013 ASTM E647-13a Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2013 ASTM E647-13e1 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2013 ASTM E647-13 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2012 ASTM E647-12 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2011 ASTM E647-11e1 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2011 ASTM E647-11 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2008 ASTM E647-08e1 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2008 ASTM E647-08 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2005 ASTM E647-05 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 2000 ASTM E647-00 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 1999 ASTM E647-99 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• 1995 ASTM E647-95 Standard Test Method for Measurement of Fatigue Crack Growth Rates