ASTM_D_1781_-_98_2021.pdf

Designation:D178198(Reapproved 2021)Standard Test Method forClimbing Drum Peel for Adhesives1This standard is issued under the fixed designation D1781;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 the determination of the peelresistance of adhesive bonds between:a relatively flexibleadherend and a rigid adherend;and the relatively flexiblefacing of a sandwich structure and its core,when tested underspecified conditions.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,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:2B209 Specification for Aluminum and Aluminum-AlloySheet and Plate(Metric)B0209_B0209MD907 Terminology of AdhesivesE4 Practices for Force Verification of Testing Machines2.2 ASTM Adjuncts:Climbing Drum Peel Tester33.Terminology3.1 DefinitionsMany of the terms used in this test methodare defined in Terminology D907.4.Summary of Test Method4.1 Determine the peeling force of a conditioned adhesivebonded sandwich assembly by peeling a face skin around acircular drum.This is done by clamping the assembly in auniversal test machine.The average peeling load is determinedusing a standard formula.5.Significance and Use5.1 This test method may be used to determine comparativerather than fundamental measurements of adhesion and isparticularly suitable for process control,some examples ofwhich are listed.5.1.1 This test method is particularly sensitive to adherendsurface preparation and is of value where the adhesive is usedin conjunction with a primer.5.1.2 When a relatively brittle adhesive is used,the peelresistance can often give an indication of the degree of cure,that is,higher values than normally realized may indicate anincomplete cure.Direct comparison of different adhesives orprocesses can only be made when specimen design and testconditions are identical.6.Apparatus6.1 Peeling Apparatus,consisting of a flanged drum,flex-ible loading straps or cables,and suitable clamps for holdingthe test specimen.The apparatus illustrated in Fig.1 has beenfound to be satisfactory.6.1.1 The outside radius of the drum is 51.00 6 0.13 mm(2.000 6 0.005 in.),and the radius of the flange,including onehalf of the thickness of the loading straps or cables,is 12.70 60.13 mm(0.500 6 0.005 in.)larger than the radius of the drum.This 12.70 6 0.13 mm(0.500 6 0.005 in.)less half thethickness of the adherend to be peeled,is the effective torquearm of the apparatus.6.1.2 Use a suitable top clamp(Fig.2)for supporting thespecimen,and a drum clamp(Fig.3)to hold the adherendagainst the face of the drum.1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is under the jurisdiction of Subcommittee D14.80 on Metal BondingAdhesives.Current edition approved June 1,2021.Published June 2021.Originallyapproved in 1960.Last previous edition approved in 2012 as D1781 98(2012).DOI:10.1520/D1781-98R21.2For 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 apparatus illustrated are available fromASTM International Headquarters.Order Adjunct No.ADJD1781.Original adjunctproduced in 1960.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.16.1.3 Balance the drum about the axis by the use ofcounterweights(as shown in Fig.1)placed diametricallyopposite the drum clamp to compensate for the weight of thisclamp.6.1.4The drum and flanges with the drum clamp and itscompensating weight weighs 3.6 kg(8 lb),a lighter weightbein