ASTM D3166-99(R2020) pdf free download

ASTM D3166-99(R2020) pdf free download.Standard Test Method for Fatigue Properties of Adhesives in Shear by Tension Loading (Metal/Metal)
1. Scope
1.1 This test method covers the measurement of fatigue strength in shear by tension loading of adhesives on a standard specimen and under specified conditions of preparation, loading, 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.
4. Significance and Use
4.1 While this test method is intended for use in metal-to- metal applications it may be used for measuring the fatigue properties of adhesives using plastic adherends, provided consideration is given to the thickness ofthe plastic adherends. Doublers may be required for plastic adherends to prevent bearing failure in the adherends. 4.2 A variation in the thickness of the adherends can influence the test results. For this reason, the thickness of the sheets used to make the test specimens should be specified in the material specification. When no thickness is specified, metal adherends 1.63 mm (0.064 in.) thick are recommended.
5. Apparatus
5.1 Testing Machine, capable ofapplying a sinusoidal cyclic axial load. The cyclic rate and type ofequipment (constant load or constant displacement) can influence test results. For this reason, the cyclic rate and equipment should be specified in the material specification. When no cyclic rate is specified 1800 cycles/min is recommended. Employ suitable grips and jaws so that the specimen can be gripped tightly and held in alignment as the load, accurate within 62 %, is applied. 6. Test Specimens 6.1 Use test specimens conforming to the shape and dimen- sions shown in Fig. 1, having grip ends suitable for use in the particular testing machine. These specimens are similar to the tension lap-shear specimens described in Test Method D1002. 6.2 At least 25 specimens shall be tested, representing at least 4 different panels. 6.3 Prepare, cut, finish, and condition the specimens in the same manner as for Test Method D1002. Employ an overlap of 9.5 mm (0.38 in.) for 1.63-mm (0.064-in.) aluminum alloys. Ensure that the dimensions of other materials are such that failures occur in the bond. (An overlap of 12.7 mm (0.50 in.) for 6.4-mm (0.25-in.) thick nonmetals should be used if possible.)
7. Procedure
7.1 Unless otherwise specified, test the specimens in an atmosphere maintained at 50 6 4 % relative humidity and 23 6 1.1°C (73.5 6 2°F). Precondition the specimens for at least 16 h. 7.2 Place the specimen in the jaws of the testing machine and grip tightly so that the specimen and the jaws are perfectly aligned in such a position that an imaginary vertical line would pass through the center of the bonded area and through the points of suspension (Fig. 1). Ensure that the edge of the lap is 25.4 mm (1 in.) from the edge of the grip. Apply the cyclic load, ranging from a maximum to approximately 10 % of the maximum, and check periodically. The maximum load selected will depend upon the strength of the adhesive in shear tension loading and the desired life. 7.3 Test five specimens each at five or more maximum loads selected such that failures occur with regular spacing over a range varying from at least 10 000 000 cycles to not less than 2000 cycles. (As a guide, the initial maximum load may be 50 % of the strength of the adhesive in shear by tension loading.) 7.4 Record the number of cycles to failure and the corre- sponding loads, calculated in megapascals (pounds-force per square inch). Measure the specimen bond dimensions accu- rately enough to calculate the area to the nearest 0.6 mm (0.01 in. 2 ). The location of failure (adhesive or joint material), and nature of failure if in the adhesive, (amounts of cohesion, adhesion, or contact failures) should be recorded for each specimen.