ASTM-E2472 2006

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E2472-06 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions

Published By	Publication Date	Number of Pages
ASTM	2006	26

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Categories: 77.040.10 - Mechanical testing of metals, ASTM

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Description

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 c ), c and/or the crack-opening displacement (COD), 5 resistance curve () . This method applies specifically to fatigue pre-cracked specimens that exhibit low constraint (crack-length-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 recommended specimens are the compact-tension, C(T), and middle-crack-tension, M(T), specimens. The fracture resistance determined in accordance with this standard is measured as c (critical CTOA value) and/or 5 (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-length-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 (, ) .

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses (English) are for information purposes only.

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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Summary of Test Method
3	Significance and Use Apparatus
4	FIG. 1
5	FIG. 2
6	FIG. 3
8	Specimen Configuration, Dimensions, and Preparation FIG. 4
9	FIG. 5
10	FIG. 6 FIG. 7
11	Procedure
12	Measurements and Interpretation
13	FIG. 8
14	FIG. 9
15	FIG. 10 FIG. 11
16	FIG. 12
17	FIG. 13
18	Report Precision and Bias Keywords A1. SPECIAL REQUIREMENTS FOR TESTING COMPACT-TENSION SPECIMENS A1.1 Specimen
19	A1.2 Apparatus A1.3 Specimen Preparation A1.4 Compact-Tension Specimen Testing FIG. A1.1
20	A2. SPECIAL REQUIREMENTS FOR TESTING MIDDLE-CRACK-TENSION SPECIMENS A2.1 Specimen A2.2 Apparatus A2.3 Specimen Preparation A2.4 Middle-Crack-Tension Specimen Testing
21	FIG. A2.1
22	A3. TEST REPORTS TABLE A3.1
23	A4. POWER-LAW FIT TO 5 AGAINST CRACK-EXTENSION DATA A4.1 A4.2 A4.3 TABLE A3.2 TABLE A3.3
24	X1. GUIDELINES FOR ANALYZING STABLE TEARING USING FINITE-ELEMENT METHODS X1.1 X2. CORRELATION BETWEEN 5 RESISTANCE CURVES AND CRITICAL CTOA X2.1 X2.2 X2.3 X2.4
25	REFERENCES FIG. X2.1

Additional information

Standard Title	E2472-06 Standard Test Method for Determination of Resistance to Stable Crack Extension under Low-Constraint Conditions
Published Code	ASTM
Publication Date	2006
Pages Count	26
ICS Codes	77.040.10 - Mechanical testing of metals

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ASTM-E2472 2006

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