ASTM_D_2919_-_01_2014.pdf

Designation:D291901(Reapproved 2014)Standard Test Method forDetermining Durability of Adhesive Joints Stressed in Shearby Tension Loading1This standard is issued under the fixed designation D2919;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers data for assessing the durabilityof adhesive lap-shear joints while stressed in contact with air,air in equilibrium with certain solutions,water,aqueoussolutions,or other environments at various temperatures.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.Specific precau-tionary statements are given in 7.4.1.3 The values stated in SI units are considered to be thestandard.The values in parentheses are for information only.2.Referenced Documents2.1 ASTM Standards:2D907 Terminology of AdhesivesD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading(Metal-to-Metal)D1828 Practice for Atmospheric Exposure of Adhesive-Bonded Joints and StructuresD2294 Test Method for Creep Properties of Adhesives inShear by Tension Loading(Metal-to-Metal)D3165 Test Method for Strength Properties of Adhesives inShear by Tension Loading of Single-Lap-Joint LaminatedAssembliesE4 Practices for Force Verification of Testing Machines2.2 ASTM Adjuncts:Durability Test Apparatus Drawings33.Terminology3.1 DefinitionsDefinitions of terms in this test methodmay be found in Terminology D907.4.Significance and Use4.1 The combination of stress and moisture decreases thedurability of most adhesive joints.Stresses in the presence ofwater or water vapor may cause some adhesive joints to fail atsome small fraction of the stress required to break the dry joint.The time to failure for a given adhesive joint generallydecreases with increasing stress,temperature,and relativehumidity.4.2 This test method may be used as an accelerated screen-ing test for assessing the durability of adhesive joints.It may beused to measure durability of adhesive joints exposed outdoorsor to environmental conditions experienced by adhesive jointsin service.The tests may also be used to determine the effectsof various surface preparations or substrates on durabilities ofadhesive joints.4.3 The durability performance of various adhesives may becompared by using this test method under uniform sets ofconditions.To assess the overall durability of a given adhesive,lap-shear joints should be tested under a range of stress,relative humidity,and temperature.For a specific end use itmay be possible to obtain the needed durability data using onlyone set of test conditions.5.Apparatus5.1 Fixture,as shown in Fig.1,3is required for this testmethod,although a fixture such as described in Test MethodD2294 may also be suitable for the performance of this test.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 March 1,2014.Published March 2014.Originallyapproved in 1971.Last previous edition approved in 2007 as D2919 01(2007).DOI:10.1520/D2919-01R14.2For 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.3Detailed working drawings for the construction of the durability test apparatusare available from ASTM International Headquarters.Order Adjunct No.ADJD2919.Original adjunct produced in 1980.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 Testing Machine,or other suitable machine capable ofapplying measured compressive loads.Force measurementshave an accuracy of 61%of any reading when calibrated incompliance with Practices E4 requirements.Machine that isequipped with a suitable loading base as shown in Fig.1,shallbe used as a loading mechanism.5.3 Outdoor Weathering Racks(Standard)are recom-mended(Practice D1828),but any stable frame may be used(for example,galvanized pipe or painted steel channel).Noother special apparatus is required for outdoor tests.6.Test Specimens6.1 The successful use of this test method depends onpreparing good quality lap-shear joints.The test joints must beprepared carefully in accordance with the adhesive manufac-turers directions or in accordance with some other specifiedset of conditions agreed upon