ASTM_B_909_-_17.pdf

Designation:B90917Standard Guide forPlane Strain Fracture Toughness Testing of Non-StressRelieved Aluminum Products1This standard is issued under the fixed designation B909;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide covers supplementary guidelines for plane-strain fracture toughness testing of aluminum products forwhich complete stress relief is not practicable.Guidelines forrecognizing when residual stresses may be significantly biasingtest results are presented,as well as methods for minimizingthe effects of residual stress during testing.This guide alsoprovides guidelines for correction and interpretation of dataproduced during the testing of these products.Test MethodE399 is the standard test method to be used for plane-strainfracture toughness testing of aluminum alloys.1.2 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 the applica-bility of regulatory limitations prior to use.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2E399 Test Method for Linear-Elastic Plane-Strain FractureToughness KIcof Metallic MaterialsE561 Test Method forKRCurve DeterminationE1823 Terminology Relating to Fatigue and Fracture Testing2.2 ANSI Standard:ANSI H35.1 Alloy and Temper Designations forAluminum32.3 ISO Standard:ISO 12737 Metallic MaterialsDetermination of PlaneStrain Fracture Toughness43.Terminology3.1 DefinitionsTerminology in Test Method E399 andTerminology E1823 are applicable herein.3.2 Definitions of Terms Specific to This Standard:3.2.1 corrected plane-strain fracture toughness a testresult,designated KQ(corrected),which has been corrected forresidual stress bias by one of the methods outlined in thisguide.3.2.1.1 DiscussionThe corrected result is an estimation ofthe KQor KIcthat would have been obtained in a residual stressfree specimen.The corrected result may be obtained from a testrecord which yielded either an invalid KQor valid KIc,but forwhich there is evidence that significant residual stress ispresent in the test coupon.3.2.2 invalid plane-strain fracture toughness a test result,designated KQ,that does not meet one or more validityrequirements in Test Method E399 or ISO 12737 and may ormay not be significantly influenced by residual stress.3.2.3 valid plane-strain fracture toughness a test result,designated KIc,meeting the validity requirements in TestMethod E399 or ISO 12737 that may or may not be signifi-cantly influenced by residual stress.4.Significance and Use4.1 The property KIc,determined by Test Method E399 orISO 12737,characterizes a materials resistance to fracture ina neutral environment and in the presence of a sharp cracksubjected to an applied opening force or moment within a fieldof high constraint to lateral plastic flow(plane strain condi-tion).A KIcvalue is considered to be a lower limiting value offracture toughness associated with the plane strain state.4.1.1 Thermal quenching processes used with precipitationhardened aluminum alloy products can introduce significant1This guide is under the jurisdiction of ASTM Committee B07 on Light Metalsand Alloys and is the direct responsibility of Subcommittee B07.05 on Testing.Current edition approved May 1,2017.Published June 2017.Originallyapproved in 2000.Last previous edition approved in 2011 as B909 00(2011).DOI:10.1520/B0909-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from International Organization for Standardization(ISO),1 rue deVaremb,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.ch.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 residual stresses in the product.Mechanical stress relief p