ASTM-E647 2005

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E647-05 Standard Test Method for Measurement of Fatigue Crack Growth Rates

Published By	Publication Date	Number of Pages
ASTM	2005	45

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Categories: 77.040.10 - Mechanical testing of metals, ASTM

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Description

ASTM E647-05

Historical Standard: Standard Test Method for Measurement of Fatigue Crack Growth Rates

ASTM E647

Scope

1.1 This test method² covers the determination of fatigue crack growth rates from near-threshold to Kmax controlled instability. Results are expressed in terms of the crack-tip stress-intensity factor range (Δ 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/crack closure may significantly influence the fatigue crack growth rate data, particularly at low stress-intensity factors and low stress ratios, although such variables are not incorporated into the computation of ΔK.

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:

Appendix X2

1.9 Special requirements for the various specimen configurations appear in the following order:

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 and health practices and determine the applicability of regulatory limitations prior to use.

Keywords

constant amplitude; crack size; fatigue crack growth rate; stress intensity factor range

ICS Code

ICS Number Code 77.040.10 (Mechanical testing of metals)

DOI: 10.1520/E0647-05

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology
3	Summary of Test Method Significance and Use
4	Apparatus Specimen Configuration, Size, and Preparation
5	Procedure FIG. 1
7	FIG. 2
9	Calculation and Interpretation of Results Report FIG. 3
10	Precision and Bias
11	Keywords A1. THE COMPACT TENSION SPECIMEN A1.1 Introduction A1.2 Specimen FIG. A1.1
12	A1.3 Apparatus A1.4 Procedure FIG. A1.2
13	A1.5 Calculation and Interpretation of Results FIG. A1.3 FIG. A1.3
14	FIG. A1.4 FIG. A1.5
15	A2. THE MIDDLE TENSION SPECIMEN A2.1 Introduction A2.2 Specimen Configuration, Size, and Preparation A2.3 Apparatus FIG. A2.1
16	A2.4 Procedure A2.5 Calculation and Interpretation of Results
17	FIG. A2.2 TABLE A2.2
18	FIG. A2.3 FIG. A2.3 FIG. A2.4
19	A3. THE ECCENTRICALLY-LOADED SINGLE EDGE CRACK TENSION SPECIMEN A3.1 Introduction A3.2 Specimen A3.3 Apparatus A3.4 Procedure A3.5 Calculations FIG. A3.1
20	A4. SPECIAL REQUIREMENTS FOR TESTING IN AQUEOUS ENVIRONMENTS A4.1 Introduction A4.2 Scope A4.3 Referenced Documents A4.4 Terminology A4.5 Significance and Use
21	A4.6 Apparatus A4.7 Procedure
22	A4.8 Report A5. GUIDELINES FOR USE OF COMPLIANCE TO DETERMINE CRACK SIZE A5.1 A5.2 A5.3 A5.4 A5.5 A5.6
23	A5.7 A6. GUIDELINES FOR ELECTRIC POTENTIAL DIFFERENCE DETERMINATION OF CRACK SIZE A6.1 A6.2 A6.3
24	FIG. A6.1 FIG. A6.2
25	A6.4 A6.5 A6.6
26	A6.7 A6.8 A6.9
27	A6.10 A6.11 A6.12
28	X1. RECOMMENDED DATA REDUCTION TECHNIQUES X1.1 Secant Method X1.2 Incremental Polynomial Method
32	X2. RECOMMENDED PRACTICE FOR DETERMINATION OF FATIGUE CRACK OPENING FORCE FROM COMPLIANCE X2.1 Introduction X2.2 Scope
33	X2.3 Terminology X2.4 Significance and Use X2.5 Basis for Determination of Opening Force From Compliance X2.6 Apparatus X2.7 Recommended Procedure—Determination of Opening Force by the Compliance Offset Method
34	FIG. X2.1 FIG. X2.2 FIG. X2.3
35	X2.8 Data Quality Requirement X2.9 Report X3. GUIDELINES FOR MEASURING THE GROWTH RATES OF SMALL FATIGUE CRACKS X3.1 Introduction FIG. X2.4
36	X3.2 Scope X3.3 Referenced Documents X3.4 Terminology X3.5 Significance and Use TABLE X3.1
37	FIG. X3.1
38	X3.6 Apparatus
39	X3.7 Specimen Configuration and Preparation FIG. X3.2
40	X3.8 Procedure X3.9 Calculation and Interpretation
41	X3.10 Reporting X3.11 Precision and Bias
42	REFERENCES

Additional information

Significance and Use	5
Summary of Use	4
Special Requirements for Testing in Aqueous Environments	Annex A4
Precision and Bias	11
Apparatus	6
Procedure	8
Calculations and Interpretation of Results	9
The Compact Tension Specimen	Annex A1
The Eccentrically-Loaded Single Edge Crack Tension Specimen	Annex A3
Guidelines for Measuring the Growth Rates Of Small Fatigue Cracks	Appendix X3
Guidelines for Use of Compliance to Determine Crack Size	Annex A5
The Middle Tension Specimen	Annex A2
Recommended Practice for Determination of Fatigue Crack Opening Force From Compliance
Specimen Configuration, Size, and Preparation	7
Guidelines for Electric Potential Difference Determination of Crack Size	Annex A6
Referenced Documents	2
Recommended Data Reduction Techniques	Appendix X1
Report	10
Terminology	3
	Section
ICS Codes	77.040.10 - Mechanical testing of metals