ASTM D1781-1998(2012) Standard Test Method for Climbing Drum Peel for Adhesives 《胶粘剂攀缘卷筒剥离的标准试验方法》.pdf
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1、Designation: D1781 98 (Reapproved 2012)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
2、 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 Department of Defense.1. Scope1.1 This test method covers the determination of the peel
3、resistance 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
4、 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 pri
5、or to use.2. Referenced Documents2.1 ASTM Standards:2B209 Specification for Aluminum and Aluminum-AlloySheet and PlateD907 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
6、 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 dete
7、rminedusing 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 adhere
8、ndsurface 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 co
9、mparison 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.
10、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.1This test method
11、is under the jurisdiction of ASTM Committee D14 onAdhesives and is under the jurisdiction of Subcommittee D14.80 on Metal BondingAdhesives.Current edition approved May 1, 2012. Published May 2012. Originallyapproved in 1960. Last previous edition approved in 2004 as D1781 98 (2004).DOI: 10.1520/D178
12、1-98R12.2For 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 illustra
13、ted are available fromASTM International Headquarters. Order Adjunct No. ADJD1781. Original adjunctproduced in 1960.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.This 12.70 6 0.13 mm (0.500 6 0.005 in.) less half thethickness of th
14、e 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.6.1.3 Balance the drum about the axis by the use ofcounterweights (as shown in Fig. 1) p
15、laced diametricallyopposite the drum clamp to compensate for the weight of thisclamp.6.1.4 The drum and flanges with the drum clamp and itscompensating weight weighs #3.6 kg (8 lb), a lighter weightbeing preferable to facilitate handling of the apparatus.4,36.2 Testing Machine, capable of applying t
16、ensile loadsunder the conditions prescribed in Section 11 and with thefollowing further requirements:6.2.1 The rate of movement between heads of the testingmachine remains essentially constant under fluctuating loads(Note 1).6.2.2 The testing machine weighs the load to within 1 %.The testing machine
17、 and range are selected such that themaximum load on the specimen falls between 15 and 85 % ofthe full-scale capacity.6.2.3 The use of autographic equipment to record loadversus head movement is recommended.6.2.4 Verification of the testing machine is made in accor-dance with the recommendations of
18、Practices E4.NOTE 1It is difficult to meet this requirement when loads aremeasured with a spring-type or pendulum-type weighing device.7. Test Specimen7.1 For evaluation of adhesives in laminated assemblies, aspecimen of the type shown in Fig. 4 has been found to besatisfactory. The specimen is 25 m
19、m (1 in.) wide between sawkerfs and at least 254 mm (10 in.) long. The specimen may becut from larger bonded panels if desired.7.2 For evaluation of adhesives in sandwich constructions,make the test specimens in conformance to the general form ofthe specimen shown in Fig. 1. The specimen is 76 mm (3
20、 in.)wide by at least 305 mm (12 in.) long, including about a25-mm (1-in.) overhang of one facing at each end. Thicknessof the core is not important, except in the sense that thesandwich specimen does not bend while the facing is beingpeeled. For comparative evaluation of adhesives in bondingmetal-f
21、aced sandwich constructions, a facing of clad aluminumalloy meeting the requirements of Specification B209, Alloy2024-T3, 0.51 mm (0.020 in.) thick with a core 12.7 mm (0.5in.) thick, has been found to be suitable. Other metal facings ofcomparable flexibility may also be used. The specimens maybe cu
22、t from larger bonded panels if desired.NOTE 2Direct comparisons of different adhesives can be made onlywhen specimen design and test conditions are identical.7.3 Test at least six specimens, for example, two or morefrom each of three bonded panels, for each adhesive sample.7.4 For sandwich construct
23、ions based on orthotropic cores,peel half of the specimens parallel to the length direction of the4A suitable climbing drum peel apparatus is available from Custom ScientificInstruments, Inc., 13 Wing Drive, Whippany, NJ, 07981.FIG. 1 Assembly of Peeling ApparatusFIG. 2 Top ClampFIG. 3 Drum ClampD17
24、81 98 (2012)2core and half parallel to the width direction, as determinedfrom the configuration of the cell structure.8. Preparation of Test Specimen8.1 Do all preconditioning or special preparation of theadherends in accordance with the recommendations of themanufacturer of the adhesive.8.2 Bond in
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