ASTM D3807-2019 pdf free download

ASTM D3807-2019 pdf free download.Standard Test Method for Strength Properties of Adhesives in Cleavage Peel by Tension Loading (Engineering Plastics-to-Engineering Plastics)
1. Scope
1.1 This test method covers the determination of the com- parative cleavage/peel strengths of adhesives for bonding engineering plastics when tested on a standard specimen and under specific conditions of preparation and testing. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory 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 the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions—Many of the terms used in this test method are defined in Terminology D907. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 semirigid adherend, n—an adherend that has dimen- sions and physical properties that permit bending at designated test temperature through any angle up to 30° without breaking or cracking.
4. Significance and Use
4.1 This test method determines strength properties of adhesives in cleavage peel by tension loading. It allows the comparative testing of cleavage/peel strengths of bonded engineering thermoplastic adherends. 4.2 Cleavage/peel forces are common in bonded assemblies. This test method gives information as to the performance of substrate/adhesive combinations under cleavage/peel forces.
5. Apparatus
5.1 Tension Testing Machine, capable of applying a tensile load having the following prescribed conditions: 5.1.1 Select the machine and loading range so that the maximum load on the specimen falls between 15 and 85 % of the upper limit of the loading range. 5.1.2 Maintain the rate of movement between heads to be essentially constant under fluctuating loads. N OTE 1—It is difficult to meet this requirement when loads are measured with a spring-type or pendulum-type weighing device. Gear- driven head separation is recommended. 5.1.3 Equip the machine with suitable grips capable of clamping the specimens firmly throughout the tests. 5.1.4 The machine is autographic, giving a chart that can be read in terms of centimetres (inches) of separation as one coordinate and applied load as the other coordinate. 5.1.5 The applied tension as measured and recorded is to be accurate within 61 %. 5.2 Conditioning Room or Desiccators, capable of main- taining a relative humidity of 50 6 5 % at 23 6 2°C.
6. Test Specimen
6.1 Laminated test panels (see Fig. 1) consist of two semirigid adherends properly prepared and bonded together in accordance with the manufacturer’s recommendations. Spe- cially prepared test specimens shall be 25.4 mm (1 in.) wide by 177.3 mm (7 in.) long, but bonded only over approximately 76 mm (3 in.) of their length. Test specimens of these same dimensions may also be cut from larger, fully laminated panels. 6.1.1 Direct comparisons of different adhesives are made only when specimen construction and test conditions are identical. N OTE 2—General purpose ABS (acrylonitrile-butadiene-styrene) molded plaques approximately 6.3 mm (0.25 in.) thick have been found satisfactory as adherends for structural adhesives. Other engineering plastics and metals have been found satisfactory for specific adhesives. N OTE 3—The adherend substrate selected must exhibit sufficient toughness and stiffness to resist substrate failure, thus forcing the adhesive layer to absorb the stresses of the testing process. Should the substrate fail cohesively, the ultimate cleavage/peel strength of the adhesive under test has not been determined. 6.2 Cut the bonded panels into 25-mm (1-in.) wide test specimens by a means that is not deleterious to the bond. A suggested cutting process employs a band saw with a 6.3-mm (0.25-in.) thick blade with 18 teeth per 25.4 mm (1 in.) and 12.5 mm (0.5 in.) wide. The feed rate and saw speed is controlled to minimize heat buildup during the sawing process. 6.3 Separate the 101-mm (4-in.) long unbonded ends suffi- ciently to insert gripping wires for attachment to testing machine jaws. 6.3.1 The gripping wire employed shall be 20-gage steel wire (0.8 mm (0.03 in.) in diameter) attached to the specimen in a manner shown in Fig. 1. Twist the gripping wires together yielding approximately 10 twists per 25 mm (1 in.) of twisted length. N OTE 4—Alternative methods of gripping wire attachment may be employed if necessary. Sufficient flexibility in the attaching wires must be maintained to allow self-alignment ofthe gripping wires during the course of the pull testing of the specimens.