ASTM D1781:98(R2021) pdf free download – Standard Test Method for Climbing Drum Peel for Adhesives.
6.1.4 The drum and flanges with the drum clamp and its compensating weight weighs 3.6 kg (8 Ib). a lighter weight being preferable to facilitate handling of the apparatus.
6.2 Testing Machine, capable of applying tensile loads under the conditions prescribed in Section 11 and with the following further requirements:
6.2.1 The rate of movement between heads of the testing machine remains essentially constant under fluctuating loads (Note 1).
6.2.2 The testing machine weighs the load to within I %. The testing machine and range are selected such that the maximum load on the specimen falls between 15 and 85 % of the full-scale capacity.
6.2.3 The use of autographic equipment to record load versus head movement is recommended.
6.2.4 Verification of the testing machine is made in accordance with the recommendations of Practices E4.
Note I—It is difficult to meet this requirement when loads are measured with a spring-type or pendulum-type weighing device
7. Test Specinien
7.1 For evaluation of adhesives in laminated assemblies, a specimen of the type shown in Fig. 4 has been found to be satisfactory. The specimen is 25 mm (1 in.) wide between saw kerfs and at least 254 mm (10 in.) long. The specimen may be cut 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 of the specimen shown in Fig. I. The specimen is 76 mm (3 in.) wide by at least 305 mm (12 in.) long, including about a 25-mm (1-in.) overhang of one facing at each end. Thickness of the core is not important, except in the sense that the sandwich specimen does not bend while the facing is being peeled. For comparative evaluation of adhesives in bonding metal-faced sandwich constructions, a facing of clad aluminum alloy meeting the requirements of Specification B209, Alloy 2024-T3. 0.5 1 mm (0.020 in.) thick with a core 1 2.7 mm (0.5 in.) thick, has been found to he suitable. Other metal facings of comparable Ilexibility may also be used. The specimens may be cut from larger bonded panels if desired.
Noit 2—Direct comparisons of different adhesives can be made only when specimen design and test conditions are idenLical.
7.3 Test at least six specimens, for example, two or more from each of three bonded panels, ftr each adhesive sample.
7.4 For sandwich constructions based on orthotropic cores, peel half of the specimens parallel to the length direction of the core and half parallel to the width direction, as determined from the configuration of the cell structure.
8. Preparation of Test Specimen
8.1 Do all preconditioning or special preparation of the adherends in accordance with the recommendations of the manufacturer of the adhesive.