ASTM_D_2095_-_96_2015.pdf

Designation:D209596(Reapproved 2015)Standard Test Method forTensile Strength of Adhesives by Means of Bar and RodSpecimens1This standard is issued under the fixed designation D2095;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 determination of the relativetensile strength of adhesives by the use of bar-and rod-shapedbutt-joined specimens under defined conditions of preparation,conditioning,and testing.This test method is applicable to thetesting of adhesives with various adherend materials in eithersimilar or dissimilar combinations.NOTE1An alternative test method for determining the tensile strengthof adhesives is Test Method D897.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D897 Test Method for Tensile Properties of Adhesive BondsD907 Terminology of AdhesivesD2094 Practice for Preparation of Bar and Rod Specimensfor Adhesion TestsE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE104 Practice for Maintaining Constant Relative Humidityby Means of Aqueous Solutions3.Terminology3.1 Many of the terms in this standard are defined inTerminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 tensile strength of an adhesive,nthe maximumtensile stress which it is capable of sustaining.Tensile strengthis calculated from the maximum load during a tension testcarried to rupture and the original cross-sectional area of thespecimen(see Terminology E6).4.Significance and Use4.1 Tension tests provide reasonably accurate informationwith regard to the tensile strength of adhesives.Tensile strengthdata may be suitable for specification acceptance,serviceevaluation,manufacturing control,research,and development.Tension tests are not considered significant for applicationsdiffering from the test in rate,direction,and type of loading.5.Apparatus5.1 Testing MachineA testing machine capable of main-taining a specified rate of loading,with the error for indicatedloads that are to be measured not exceeding 61%and theload-indicating mechanism essentially free of inertial lag at aspecified rate of loading.Verify the accuracy of the testingmachine in accordance with Practices E4.Ensure that thetesting machine is provided with the following:5.1.1 Fixed MemberA fixed or essentially stationarymember carrying one attachment fixture.5.1.2 Movable MemberA movable member carrying asecond attachment fixture.5.1.3 Attachment FixturesSelf-aligning type fixtures forholding a specimen between the fixed member and the movablemember.Ensure that the fixtures are attached to the fixed andmovable members in such a way that they will move intoalignment as soon as load is applied,so that the long axis of thetest specimen will coincide with the direction of the appliedload.Adesign for fixtures that has proven satisfactory is shownin Fig.1 and Fig.2.5.2 Conditioning Room or DesiccatorsA conditioningroom capable of maintaining a relative humidity of 50 6 2%at 23 6 1C(73.4 6 1.8F)or desiccators containing asaturated salt solution(Note 2)to give the same relativehumidity and temperature.NOTE2A saturated salt solution of calcium nitrate will give approxi-mately 51%relative humidity at 24.5C(see Practice E104).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 April 1,2015.Published April 2015.Originallyapproved in 1962.Last previous edition approved in 2008 as D2095 96(2008).DOI:10.1520/D2095-96R15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Test Specimens6.1 Description and PreparationBar-or rod-type speci-mens.Refer to Practice D2094 for the design of the specimensand the procedures used in preparing them.6.2 Number of SpecimensTest a minimum of five speci-mens for each test condition.7.Conditioning7.1 Condition all specimens,except those in which bothadherends are metals,prior to testing for at least 40 h at 50 61C(73.4 6 1.8F).Metal-to-metal bonds can be tested assoon as the s