ASTM B645-2007 Standard Practice for Linear-Elastic Plane-Strain Fracture Toughness Testing of Aluminum Alloys《铝合金线性弹性平面应变断裂韧性测试的标准实施规程》.pdf
《ASTM B645-2007 Standard Practice for Linear-Elastic Plane-Strain Fracture Toughness Testing of Aluminum Alloys《铝合金线性弹性平面应变断裂韧性测试的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM B645-2007 Standard Practice for Linear-Elastic Plane-Strain Fracture Toughness Testing of Aluminum Alloys《铝合金线性弹性平面应变断裂韧性测试的标准实施规程》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 645 07Standard Practice forLinear-Elastic PlaneStrain Fracture Toughness Testing ofAluminum Alloys1This standard is issued under the fixed designation B 645; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.INTRODUCTIONLinear-elastic plane-strain fractu
3、re toughness testing of aluminum alloys is performed essentially inaccordance with Test Method E 399. However, there is a need, in the application of Test Method E 399for quality assurance testing, to deal with the interpretation of the results for material qualification andrelease in cases where al
4、l requirements for valid measurements of plane-strain fracture toughnesscannot be met. It is the purpose of this practice to provide consistent methods of dealing with thosesituations.1. Scope*1.1 This practice is applicable to the fracture toughnesstesting of all aluminum alloys, tempers, and produ
5、cts, espe-cially in cases where the tests are being made to establishwhether or not individual lots meet the requirements ofspecifications and should be released to customers.1.2 Test Method E 399 is the basic test method to be usedfor plane-strain fracture toughness testing of aluminum alloys.The p
6、urpose of this practice is to provide supplementaryinformation for plane-strain fracture toughness of aluminumalloys in three main areas:1.2.1 Specimen sampling,1.2.2 Specimen size selection, and1.2.3 Interpretation of invalid test results.1.3 The values stated in SI units are to be regarded as thes
7、tandard. The values given in parentheses are provided forinformation only.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine
8、 the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B 646 Practice for Fracture Toughness Testing of Alumi-num AlloysE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE 399 Test Method for Linear-Elasti
9、c Plane-Strain FractureToughness KICof Metallic MaterialsE 561 Test Method for K-R Curve DeterminationE 1823 Terminology Relating to Fatigue and Fracture Test-ing3. Terminology3.1 GeneralTerms, definitions, symbols, and orientationdesignations in Test Method E 399 and Terminology E 1823are applicabl
10、e herein.3.2 The following additional definitions are applicable:3.2.1 invalid plane-strain fracture toughnesstest result,KQ, that does not meet one or more of the validity requirementsin Test Method E 399 and, where so characterized, is of novalue in judging the true plain-strain fracture toughness
11、 of amaterial but may, under certain conditions, adequately guaran-tee the materials fracture toughness for lot release purposes.1This practice is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.05 onTesting.Current edition
12、approved Sept. 1, 2007. Published September 2007. Originallyapproved in 1978. Last previous edition approved in 2002 as B 64502.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informatio
13、n, refer to the standards Document Summary page onthe ASTM website.1*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.3.2.2 valid plane-strain, fracture toughnesstest res
14、ultmeeting all the validity requirements in Test Method E 399,that is, a value of KIc.4. Summary of Practice4.1 This practice supplements Test Method E 399 and Prac-tice B 646 in three main areas:4.1.1 Specimen sampling,4.1.2 Specimen size selection, and4.1.3 Interpretation of results that fail the
15、validity require-ments in Test Method E 399 in one of the following areas inorder to determine if the invalid results are usable for lotrelease:4.1.3.1 Pmax/PQrequirements,4.1.3.2 Specimen size requirements, and4.1.3.3 Fatigue precracking requirements.5. Significance and Use5.1 This practice for pla
16、ne-strain fracture toughness testingof aluminum alloys may be used as a supplement to TestMethod E 399. The application of this practice is primarilyintended for quality assurance and material release in caseswhere valid plane-strain fracture toughness data cannot beobtained per Test Method E 399.5.
17、2 It must be understood that the interpretations andguidelines in this practice do not alter the validity requirementsof Test Method E 399 or promote the designation of data thatare invalid according to Test Method E 399 to a “valid”condition. This practice is primarily concerned with caseswhere it
18、is not possible or practical to obtain valid data, butwhere material release judgments must be made againstspecified fracture toughness values. Where it is possible toobtain a valid plane-strain fracture toughness value by replace-ment testing according to Test Method E 399, that is thepreferred app
19、roach.6. Apparatus6.1 All apparatus shall be in conformance with Test MethodE 399.7. Sampling7.1 Sampling requirements stated in the individual materialspecifications shall be followed. In the absence of specificrequirements in the individual material specifications, speci-mens shall be taken at the
20、 following locations:7.1.1 Specimens from plate shall be from the mid-thickness,until the plate thickness is twice the standard specimenthickness for that particular product (that is, the specimenthickness selected for lot release and quality assurance testingwhich typically yields a valid KIcfor th
21、at particular alloy andproduct), at and beyond which the specimen shall be centeredat the quarter-thickness location.7.1.2 Specimens from forgings, extrusions, and rod shall betaken from the center of the cross section as far as is practical.NOTE 1Considerable care should be taken in specifying the
22、locationof specimens within the thickness of the thick plate, forgings, extrusions,or rod because fracture toughness may vary appreciably with locationthrough the thickness.8. Test Specimen Configuration and Dimensions8.1 Specimen size requirements stated in the individualmaterial specifications sha
23、ll be followed. In the absence ofspecific requirements, the specimen types, general configura-tion, and size requirements in Test Method E 399 are appli-cable herein with the following supplemental recommenda-tions and requirements:8.1.1 For aluminum products, the recommended minimumspecimen ligamen
24、t length is:W a! $5KQ/sYS!2(1)rather than the required minimum of:W a! $2.5KQ/sYS!2(2)in Test Method E 399.NOTE 2Experimental studies3have shown that more uniform valuesof KQare obtained for high toughness aluminum alloys when theconditions of Eq 1 are met.8.1.2 In all cases, the specimen W/B ratio
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