ASTM_D_5656_-_10.pdf

Designation:D565610Standard Test Method forThick-Adherend Metal Lap-Shear Joints for Determination ofthe Stress-Strain Behavior of Adhesives in Shear byTension Loading1This standard is issued under the fixed designation D5656;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 test method covers the preparation and testing ofthick-adherend lap-shear samples for the determination of thestress-strain behavior of adhesives.1.2 This test method covers data reduction and analysis ofstress-strain curves obtained using thick-adherend lap-shearsamples.1.3 The values stated in SI units are to be regarded as thestandard.The inch-pound units in parentheses are for informa-tion 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 the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in 7.3.2.Referenced Documents2.1 ASTM Standards:2D907 Terminology of AdhesivesD2651 Guide for Preparation of Metal Surfaces forAdhesiveBondingD4896 Guide for Use of Adhesive-Bonded Single Lap-JointSpecimen Test ResultsE4 Practices for Force Verification of Testing Machines3.Terminology3.1 Definitions:3.1.1 Many terms in this test method are defined in Termi-nology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 knee,ninflection point on a load-deflection curve;the point at which plastic yielding of the adhesive begins todominate the deformation response of the load-deflectioncurve.3.2.2 panel,ntwo plates of a rigid material having thesame dimensions that are adhesively bonded together on oneface such that the thickness of the panel is approximately twicethe thickness of each individual plate.4.Summary of Test Method4.1 This test method consists of testing thick-adherendlap-shear samples whereby a tensile load is applied to thesample but the adhesive is placed in shear.Unlike GuideD4896,the adherends used in this standard test method arethick and rigid,peel forces are minimized and the shearstress-strain properties of the adhesive are obtained.Refer-enced data presents a finite element analysis of the thick-adherent metal lap shear specimen and calculates the effect ofvarying the adherent and adhesive stiffness.3User of thisstandard is cautioned that since the stress is not totally uniformacross the over-lap of the specimen,factors such as adhesivestiffness,adherent stiffness and location of shear strain mea-surement along the length of the bond can affect the experi-mentally obtained load-displacement curve.3,4NOTE1The peel forces generated during testing are a function of thebending deformation in the adherends.Greater adherend stiffness resultsin less bending and smaller peel forces.5.Significance and Use5.1 This test method can be used to determine the stress-strain properties of an adhesive in shear and to establish theproportional-limit of the stress-stain relationship.This datamay be useful for the design and analysis of adhesively bondedjoints.1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.80 on MetalBonding Adhesives.Current edition approved Oct.1,2010.Published October 2010.Originallyapproved in 1995.Last previous edition approved in 2004 as D5656 041.DOI:10.1520/D5656-10.2For 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.3Kassapoglou,C.and Adelmann,John C.,“KGR-1 Thick Adherend SpecimenEvaluation for the Determination of Adhesive Mechanical Properties,”23rdInternational SAMPE Conference,Oct.2124,1991.4Krieger,R.B.,Jr.,“Stiffness Characteristics of Structural Adhesives for StressAnalysis in Hostile Environment,”American Cyanamid Co.,Havre de Grace,MD,1975.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 This test method is not intended to determine adhesioncharacteristics of an adhesive to a particular substrate;ratherthis test method is intended to characterize the adhesive shearstress-strain properties that may be relevant for design consid-erations.5.3 This test method has been developed and applied usingbonded aluminum adherends.At this time no assumptionsregarding the validity of this test method with non-aluminumadherends can be made.6.Apparatus6.1 Testing machine conforming to the requirements ofPractices E4.Select the testing machine so that the breakingload of the specimens falls between 15 and 85%of thefull-sc