ASTM B645-07
(Practice)Standard Practice for Linear-Elastic Plane-Strain Fracture Toughness Testing of Aluminum Alloys
Standard Practice for Linear-Elastic Plane-Strain Fracture Toughness Testing of Aluminum Alloys
SIGNIFICANCE AND USE
This practice for plane-strain fracture toughness testing of aluminum alloys may be used as a supplement to Test Method E 399. The application of this practice is primarily intended for quality assurance and material release in cases where valid plane-strain fracture toughness data cannot be obtained per Test Method E 399.
It must be understood that the interpretations and guidelines in this practice do not alter the validity requirements of Test Method E 399 or promote the designation of data that are invalid according to Test Method E 399 to a “valid” condition. This practice is primarily concerned with cases where it is not possible or practical to obtain valid data, but where material release judgments must be made against specified fracture toughness values. Where it is possible to obtain a valid plane-strain fracture toughness value by replacement testing according to Test Method E 399, that is the preferred approach.
SCOPE
1.1 This practice is applicable to the fracture toughness testing of all aluminum alloys, tempers, and products, especially in cases where the tests are being made to establish whether or not individual lots meet the requirements of specifications and should be released to customers.
1.2 Test Method E 399 is the basic test method to be used for plane-strain fracture toughness testing of aluminum alloys. The purpose of this practice is to provide supplementary information for plane-strain fracture toughness of aluminum alloys in three main areas:
1.2.1 Specimen sampling,
1.2.2 Specimen size selection, and
1.2.3 Interpretation of invalid test results.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information 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.
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Designation:B645–07
Standard Practice for
Linear-Elastic Plane–Strain Fracture Toughness Testing of
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Aluminum Alloys
This standard is issued under the fixed designation B645; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
INTRODUCTION
Linear-elasticplane-strainfracturetoughnesstestingofaluminumalloysisperformedessentiallyin
accordancewithTestMethodE399.However,thereisaneed,intheapplicationofTestMethodE399
forqualityassurancetesting,todealwiththeinterpretationoftheresultsformaterialqualificationand
release in cases where all requirements for valid measurements of plane-strain fracture toughness
cannot be met. It is the purpose of this practice to provide consistent methods of dealing with those
situations.
1. Scope* 2. Referenced Documents
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1.1 This practice is applicable to the fracture toughness 2.1 ASTM Standards:
testing of all aluminum alloys, tempers, and products, espe- B646 PracticeforFractureToughnessTestingofAluminum
cially in cases where the tests are being made to establish Alloys
whether or not individual lots meet the requirements of E29 Practice for Using Significant Digits in Test Data to
specifications and should be released to customers. Determine Conformance with Specifications
1.2 TestMethodE399isthebasictestmethodtobeusedfor E399 Test Method for Linear-Elastic Plane-Strain Fracture
plane-strainfracturetoughnesstestingofaluminumalloys.The Toughness K of Metallic Materials
Ic
purpose of this practice is to provide supplementary informa- E561 Test Method for K-R Curve Determination
tion for plane-strain fracture toughness of aluminum alloys in E1823 Terminology Relating to Fatigue and Fracture Test-
three main areas: ing
1.2.1 Specimen sampling,
3. Terminology
1.2.2 Specimen size selection, and
3.1 General—Terms, definitions, symbols, and orientation
1.2.3 Interpretation of invalid test results.
1.3 The values stated in SI units are to be regarded as the designations inTest Method E399 andTerminology E1823 are
applicable herein.
standard. The values given in parentheses are provided for
information only. 3.2 The following additional definitions are applicable:
3.2.1 invalid plane-strain fracture toughness—test result,
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the K ,thatdoesnotmeetoneormoreofthevalidityrequirements
Q
responsibility of the user of this standard to establish appro- in Test Method E399 and, where so characterized, is of no
value in judging the true plain-strain fracture toughness of a
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. material but may, under certain conditions, adequately guaran-
tee the material’s fracture toughness for lot release purposes.
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This practice is under the jurisdiction of ASTM Committee B07 on Light
Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on
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Testing. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2007. Published September 2007. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1978. Last previous edition approved in 2002 as B645–02. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/B0645-07. the ASTM website.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B645–07
3.2.2 valid plane-strain, fracture toughness—test result 8. Test Specimen Configuration and Dimensions
meetingallthevalidityrequirementsinTestMethodE399,that
8.1 Specimen size requirements stated in the individual
is, a value of K .
Ic material specifications shall be followed. In the absence of
specific requirements, the specimen types, general configura-
4. Summary of Practice
tion,andsizerequirementsinTestMethodE399areapplicable
4.1 This practice supplements Test Method E399 and Prac-
herein with the following supplemental recommendations and
tice B646 in three main areas:
requirements:
4.1.1 Specimen sampling,
8.1.1 For aluminum products, the recommended minimum
4.1.2 Specimen size selection, and
specimen ligament length is:
4.1.3 Interpretation of results that fail the validity require-
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W– a $5· K /s (1)
~ ! ~ !
Q YS
ments in Test Method E399 in one of the following areas in
rather than the required
...
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