ASTM_D_4501_-_01_2014.pdf

Designation:D450101(Reapproved 2014)Standard Test Method forShear Strength of Adhesive Bonds Between RigidSubstrates by the Block-Shear Method1This standard is issued under the fixed designation D4501;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 describes a procedure and fixture usedto determine shear strengths of adhesives used to bond mate-rials with moduli higher than the modulus of the adhesive.Thesize and shape of the specimens are variable within thephysical restraints of the fixture.1.2 The values stated in SI units are to be regarded as thestandard.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:2D907 Terminology of AdhesivesE4 Practices for Force Verification of Testing Machines2.2 ASTM Adjuncts:Shearing Fixture Drawings33.Terminology3.1 Many terms used in this test method are defined inTerminology D907.4.Summary of Test Method4.1 In this test method,blocks,plates,or disks are bondedtogether,and the maximum force to shear them apart isdetermined.5.Significance and Use5.1 This test method provides an estimate of the shearstrength of an adhesive on various machinable and nonmachin-able substrate materials.It is particularly applicable for testingbonds between ceramic,glass,magnet moldings,and plasticparts with one flat face where machining would be difficult orimpractical.6.Apparatus6.1 Testing Machine,conforming to the requirements ofPractices E4,with a capacity of not less than 44 kN(10 000lbf)in tension.6.2 Shearing FixturePerform the tests by using a shearingfixture consisting of a holding block and a shearing tool(Figs.1 and 2).The holding block can accommodate specimens up to80 by 80 by 13 mm(3 by 3 by12in.).For small specimens asshown in Fig.3B,an adapter plate(Fig.4)can be inserted intothe holding block to keep the shearing blade within its guidesand to locate the specimen under the clamp.The shearing bladecan accommodate specimens up to 30 by 30 by 13 mm(118by118by12in.).37.Test Specimens7.1 Test specimens can be any size within the limits of theshearing fixture capacity,as given in 6.2.Suggested sizes are asfollows:7.1.1 Metal Blocks25 by 25 by 6 mm(1 by 1 by14in.).7.1.2 Ferrite or Ceramic Blocks25 by 18 by 13 mm(1 by34by12in.).7.1.3 Wood or Plastic Blocks25 by 25 by 13 mm(1 by 1by12in.).7.1.4 Glass Plates75 by 75 by 13 mm(3 by 3 by12in.).7.2 Prepare the adhesive and apply in accordance with therecommendations of the adhesive manufacturer.Assemble theadhesive-coated specimens,and bond them in accordance withthe procedure under investigation.NOTE1Assemble the thrust surfaces,where the straight-sided speci-men contacts the fixture,so that they are parallel to the fixture within0.005 in./in.(0.005 mm/mm).Center round or shaped specimens withinthe shear blade in such a way that a moment is not applied to the specimenduring shearing.1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.40 on Adhesives forPlastics.Current edition approved March 1,2014.Published March 2014.Originallyapproved in 1985.Last previous edition approved in 2009 as D4501 091.DOI:10.1520/D4501-01R14.2For 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 drawings of the fixture are available from ASTM InternationalHeadquarters.Order Adjunct No.ADJD4501.Original adjunct produced in 1985.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.3 Remove any flash or fillets on the loaded side prior totesting.Fig.3 shows typical specimens after bonding.7.4 Test at least five specimens for each test condition.8.Procedure8.1 Mount the shear fixture in the testing machine with theholding block on top.8.2 Place the specimen in the shearing fixture in such a waythat one of the adherends is engaged by the holding block andthe other by the shearing tool(Fig.5).Close the toggle clampon the rear of the holding block to keep the specimen locatedagainst the back face(Fig.6).(Some adjustment of the padmay be necessary to accommodate varying specimen thick-ness.)8.3 Test the specimen using a crosshead speed of 1.26mm/min(0.05 in./min).Record the maximum force sustainedby the specimen.9.Calculation9.1 Express all bond strengths in megapascal(MPa)orpound-force per square inch(psi).10.Rep