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ASTM-E1820:2009 Edition

ASTM-E1820:2009 Edition

$63.38

E1820-09 Standard Test Method for Measurement of Fracture Toughness

Published By Publication Date Number of Pages
ASTM 2009 48
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1.1 This test method covers procedures and guidelines for the determination of fracture toughness of metallic materials using the following parameters: K, J , and CTOD ( ? ). Toughness can be measured in the R -curve format or as a point value. The fracture toughness determined in accordance with this test method is for the opening mode (Mode I) of loading.

1.2 The recommended specimens are single-edge bend, [SE(B)], compact, [C(T)], and disk-shaped compact, [DC(T)]. All specimens contain notches that are sharpened with fatigue cracks.

1.2.1 Specimen dimensional (size) requirements vary according to the fracture toughness analysis applied. The guidelines are established through consideration of material toughness, material flow strength, and the individual qualification requirements of the toughness value per values sought.

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

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

Note 1Other standard methods for the determination of fracture toughness using the parameters K, J , and CTOD are contained in Test Methods E399 , E813 , E1152 , E1290 , and E1737 . This test method was developed to provide a common method for determining all applicable toughness parameters from a single test.

A14.1.1 This annex covers the determination of the rate dependent J Ic (t) and the J -integral versus crack growth resistance curve ( J-R(t) curve) for metallic materials under conditions where the loading rate exceeds that allowed for conventional (static) testing, see Section 8.4.2.

A15.1.1 The normalization technique can be used in some cases to obtain a J-R curve directly from a force displacement record taken together with initial and final crack size measurements taken from the specimen fracture surface. Additional restrictions are applied (see A14.1.3) which limit the applicability of this method. The normalization technique is described more fully in Herrera and Landes ( 21 ) and Landes, et al. ( 22 ), Lee ( 23 ), and Joyce ( 20 ). The normalization technique is most valuable for cases where high loading rates are used, or where high temperatures or aggressive environments are being used. In these, and other situations, unloading compliance methods are impractical. The normalization method can be used for statically loaded specimens if the requirements of this section are met. The normalization method is not applicable for low toughness materials tested in large specimen sizes where large amounts of crack extension can occur without measurable plastic force line displacement.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 FIG. 1
4 Summary of Test Method
Significance and Use
Apparatus
5 FIG. 2
FIG. 3
6 Specimen Size, Configuration, and Preparation
FIG. 4
7 FIG. 5
FIG. 6
8 FIG. 7
9 Procedure
10 Analysis of Results
11 Report
FIG. 8
12 Precision and Bias
Keywords
FIG. 9
13 A1. SPECIAL REQUIREMENTS FOR TESTING SINGLE EDGE BEND SPECIMENS
A1.1 Specimen
A1.2 Apparatus
A1.3
A1.4 Calculation
FIG. A1.1
14 FIG. A1.2
15 FIG. A1.3
16 A2. SPECIAL REQUIREMENTS FOR TESTING COMPACT SPECIMENS
A2.1 Specimen
FIG. A2.1
17 A2.2 Apparatus
A2.3 Specimen Preparation
A2.4 Calculation
FIG. A2.2
19 A3. SPECIAL REQUIREMENTS FOR TESTING DISK-SHAPED COMPACT SPECIMENS
A3.1 Specimen
A3.2 Apparatus
A3.3 Specimen Preparation
A3.4 Procedure
FIG. A2.3
20 A3.5 Calculation
FIG. A3.1
22 A4. METHODS FOR EVALUATING INSTABILITY AND POP-IN
A4.1 Assessment of Force/Clip Gage Displacement Records
23 FIG. A4.1
FIG. A4.2
24 A5. METHOD FOR KIc DETERMINATION
A5.1
A5.2
A5.3
FIG. A4.3
FIG. A5.1
25 A5.4
A5.5
A6. FRACTURE INSTABILITY TOUGHNESS DETERMINATION USING J
A6.1
A6.2
26 A6.3
A6.4
A7. FRACTURE INSTABILITY TOUGHNESS DETERMINATION USING CTOD ()
A7.1
A7.2
A7.3
A8. J-R CURVE DETERMINATION
A8.1
A8.2
27 A8.3
A8.4
FIG. A8.1
28 A9. JIc and KJIc EVALUATION
A9.1
A9.2
A9.3
A9.4
A9.5
A9.6
FIG. A9.1
29 A9.7
A9.8
A9.9
A9.10 Evaluation of KJIc
FIG. A9.2
30 A10. METHOD FOR -R CURVE DETERMINATION
A10.1
A10.2
A10.3
A10.4
A11. METHOD FOR Ic DETERMINATION
A11.1
A11.2
A11.3
A11.4
FIG. A10.1
31 A11.5
A11.6
FIG. A11.1
32 A11.7
A11.8
A11.9
A12. COMMON EXPRESSIONS
A12.1
A12.2
FIG. A11.2
33 A13. METHOD FOR RAPID LOADING KIc DETERMINATION
A13.1
A13.2
A13.3
A13.4
TABLE A12.1
TABLE A12.2
34 A13.5
A13.6
35 A14. SPECIAL REQUIREMENTS FOR RAPID-LOAD J-INTEGRAL FRACTURE TOUGHNESS TESTING

A14.1 Scope
A14.2 Summary of Requirements
FIG. A13.1
FIG. A13.2

36 A14.3. Terminology
A14.4 Significance and Use
A14.5 Apparatus
37 FIG. A14.1
FIG. A14.2
38 FIG. A14.3
39 FIG. A14.4
40 FIG. A14.5
FIG. A14.6
41 A14.6 Procedure
A14.7 Qualification of the Data
A14.8 Qualifying the High Rate Results
A14.9 Report
42 A14.10 Precision and Bias
A15. NORMALIZATION DATA REDUCTION TECHNIQUE
A15.1 Scope
A15.2 Analysis
FIG. A14.7
43 FIG. A15.1
44 FIG. A15.2
FIG. A15.3
45 A15.3 Additional Requirements
A15.4 Report
FIG. A15.4
46 A15.5 Precision and Bias
A16. EVALUATION OF CRACK GROWTH CORRECTED J-INTEGRAL VALUES
A16.1 J Correction Procedure
FIG. A15.5
47 X1. EXAMPLE
X1.1
X1.2
REFERENCES

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