ASTM_D_5266_-_13_2020.pdf

Designation:D526613(Reapproved 2020)Standard Practice forEstimating the Percentage of Wood Failure in AdhesiveBonded Joints1This standard is issued under the fixed designation D5266;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 practice provides procedures for estimating thepercentage of wood failure that occurs in plywood-shear,block-shear,finger joint test specimens,or any other bondlineinvolving wood.1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are provided for informa-tion only.1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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:2D905 Test Method for Strength Properties of AdhesiveBonds in Shear by Compression LoadingD906 Test Method for Strength Properties of Adhesives inPlywood Type Construction in Shear by Tension LoadingD2559 Specification for Adhesives for Bonded StructuralWood Products for Use Under Exterior Exposure Condi-tionsD4688 Test Method for Evaluating Structural Adhesives forFinger Jointing LumberD5572 Specification for Adhesives Used for Finger Joints inNonstructural Lumber ProductsD5751 Specification forAdhesives Used for Laminate Jointsin Nonstructural Lumber Products2.2 American National Standards:ANSI/HPVA HP-1-2009 American National Standard forHardwood and Decorative Plywood3ANSI A190.1-2012 American National Standard for WoodProductsStructural Glued,Laminated Timber32.3 Other Documents:American Plywood Association Proposed Standard Methodfor Estimating Percentage Wood Failure on PlywoodShear Specimens4PS 1 U.S.Product Standard for Construction and IndustrialPlywood4CSA O112.9 Evaluation of Adhesives for Structural WoodProducts(Exterior Exposure)4General Technical Report FPL-GTR-1905Inspection Bureau Memorandum No.1 Interpretation ofWood Failure42.4 ASTM Adjunct:Photographs for Visually Estimating the Percentage of WoodFailure in Standard Adhesively Bonded Specimens63.Terminology3.1 Definitions:3.1.1 deep wood failure,nfailure that is invariably severalto many cells away from the adhesive layer,in which thefracture path is strongly influenced by the grain angle andgrowthring structure.3.1.2 shallow wood failure,nfailure that is invariablywithin the first one or two layers of cells beyond the adhesivelayer in which the fracture path is not influenced by thewoodgrain angle or growth-ring structure(see 7.7 and 8.1).3.1.3 wood failure,nthe rupturing of wood fibers instrength tests on bonded specimens,usually expressed as thepercentage of the total area involved which shows such failure.1This practice is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.30 on Wood Adhesives.Current edition approved April 1,2020.Published April 2020.Originallyapproved in 1992.Last previous edition approved in 2013 as D5266 13.DOI:10.1520/D5266-13R20.2For 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 Hardwood Plywood&Veneer Association,1825 MichaelFaraday Drive,P.O.Box 2789,Reston,VA 20190,www.hpva.org.4Available from APA The Engineered Wood Association,7011 South 19th St.,Tacoma,WA 98466,www.apawood.org.5Wood Handbook:Wood as an Engineering Material,Madison,WI:U.S.Department ofAgriculture,Forest Service,Forest Products Laboratory,508 p.2010.6Available from ASTM International Headquarters.Request Adjunct No.ADJD5266.Original adjunct produced in 1991.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.4.Significance and Use4.1 An estimate of wood failure is one of the principalmeans for determining the quality of an adhesively bondedwood joint.4.2 When evaluated after a water soaking,water