ASTM D952-15(R2021) pdf free download

ASTM D952-15(R2021) pdf free download.Standard Test Method for Bond or Cohesive Strength of Sheet Plastics and Electrical Insulating Materials
1. Scope
1.1 This test method covers the determination of the bond strength or ply adhesion strength of sheet plastic and electrical insulating materials. It is applicable to both laminated and nonlaminated thermoplastic and thermosetting materials. 1.2 Test data obtained by this test method is relevant and appropriate for use in engineering design. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 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. N OTE 1—There is no known ISO equivalent to this standard. 1.5 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.
4. Significance and Use
4.1 This test, when applied to laminated plastics, is a measure ofthe interlaminar or intralaminar strength, whichever is smaller, in a direction normal to the plane of the laminate. When applied to nonlaminated plastics, the test is a measure of the cohesive strength of the material. The property determined is fundamental and has not yet been correlated with the results of any other method for bond strength. 4.2 The test is potentially useful as (1) a research test when studying the effects of changes in independent variables, (2) a specification test, or (3) a referee test. 4.3 Before proceeding with this test method, make reference to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions or testing parameters or combination thereof covered in the relevant ASTM materials specification shall take precedence over those in this test method. If there are no relevant ASTM material specifications then the default conditions apply. Table 1 of Classification System D4000 lists the ASTM materials stan- dards that currently exist.
5. Apparatus and Materials
5.1 Testing Machine—Any suitable tensile testing machine capable of crosshead movement at a constant rate of 1.3 mm/min. (0.05 in/min.) and of sufficient capacity to exceed the failure load of the material being tested.5.2 Loading Fixtures—The loading fixtures shall be self- aligning and shall not apply eccentric loads. 5.3 Metal Blocks—A pair of 51-mm (2-in.) square metal blocks each having a maximum height of 51 mm (2 in.). Each block shall be configured to permit attachment to the testing machine’s loading fixture (see Fig. 1). N OTE 2—Blocks constructed from heat-treated aluminum alloy, each having a hole in one end tapped 7 ⁄ 8 in. in accordance with ANSI B1.1, to accommodate threaded 7 ⁄ 8 -in. studs of convenient length, have been used successfully. 5.4 Adhesive—It is acceptable to use any adhesive that is found to perform satisfactorily under this test provided that it will not influence the specimen behavior by physical or chemical effects. N OTE 3—Redux 4 has been found satisfactory for use with certain thermoset materials. Cyanoacrylate cement and room-temperature-curing epoxy have been used successfully for both thermoplastic and thermoset materials.
6. Test Specimen
6.1 The test specimen shall consist of sheet material 51 mm (2 in.) square, prepared in such a manner as to produce smooth edges. The thickness of the specimen shall be the thickness of the material. Opposite surfaces need to be as parallel as possible to prevent eccentric loading of the material. 6.1.1 Thickness of the test specimens shall be determined in accordance with Guide D6988 for materials 0.25 mm or less in thickness, and Test Methods D5947 for materials greater than 0.25 mm in thickness. 6.2 At least five specimens shall be tested for each sample. 6.3 For testing the material specified, this test method is designed so that failure between the adhesive and the metal does normally not occur. If failure does occur between the adhesive and the metal blocks, or between the adhesive and the specimen, discard the result and test another specimen.