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Determination of tensile adhesive shear strength
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1. Scope Provides metal to metal at room temperature adhesive tensile lap shear strength determination. This standard applies to prepared under specified conditions, the standard test sample. GB 7124-1986 equivalent with ISO 4587-1979 "adhesive - high strength adhesive tensile lap shear strength determination." 2. Principle Structure of the sample is a single lap. The surface of the sample applied longitudinal tensile lap shear, measured samples can withstand the maximum load. The average lap shear stress surface of the metal adhesive tensile lap shear strength. 3. Device 3.1 Test Machine Testing machine used in the destruction of the sample should be made in full scale load of 15% -85% load between. Show of force testing machine error should not exceed the value of 1%. Testing machine should be equipped with an automatic aligning the sample holder so that the center line of force line consistent with the sample. Testing machine specimen holder should ensure that the movement rate (5 ± 1) mm / min to maintain stability. Measuring 3.2 Measuring the sample length and width of the lap surface measuring accuracy of not less than 0. 05mm. 3.3 jig Bonding fixture should be able to ensure that the specimen samples meet the bonding requirements of section 4. (Note: The guarantee does not destroy the metal case of the sample and the sample holder can also be sold, hole connections. But not for arbitration test.) 4. Specimen 4.1 Unless otherwise specified, the sample should be consistent with Figure 1, the shape and size. Lap length of standard specimens (12.5 ± 0.5) mm, the thickness of sheet metal (2.0 ± 0.1) mm [ISO thickness (1.6 ± 0.1) mm]. Lap length or specimen thickness of the different pieces of metal on the test results would be affected. 4.2 recommend the use of aluminum alloy LY12-CZ, 1Cr18Ni9Ti stainless steel, 45 steel, T2 copper and other metal materials. 4.3 routine tests, the sample size should not be less than five. Arbitration shall not be less than ten the number of test specimens. Note: 1. For the high-strength glue dry agent, such as occurs when the metal side of the test material yield or damage to the case, the metal thickness can be increased or reduced the length of overlap between the two is better select the former. 2. Test, the stress metal should not exceed its yield strength σs, t the thickness of sheet metal can be calculated as follows: t = lgτ / σs Where: t a metal thickness, mm; overlap length l of a sample, mm; adhesive tensile shear strength τ a, Mpa; σs - metal yield strength, MPa. 5. Sample Preparation 5.1 The sample can be used without the groove (Figure 2) or grooved (Figure 3) Preparation of the plate can also be single preparation. 5.2 bonding with the metal surface should be smooth, there should not be bent, warped, skewed and other deformation. There should be no metal burrs, edge-preserving right angles. 5.3 bonding, the metal surface treatment, adhesive ratio, amount of glue, glue the number of home air time bonding adhesive curing process and the temperature, pressure and time according to the requirements of the use of adhesives. 5.4 Preparation of the sample fixture should be used to ensure that the sample correctly and precisely position lap. 5.5 Cutting the plate has been glued, it is necessary to prevent sample overheating, glue joints should be avoided injury. 6. Test conditions Unless otherwise specified, the parking time and sample test environment shall meet the following requirements. 6.1 Preparation of test specimens to the test after the shortest time of 16h, for a maximum of a month. 6.2 The test should be at a temperature of (2312) ℃ in the environment. Arbitration test or of temperature and humidity-sensitive adhesive should be at a temperature (23 ± 2) ℃, relative humidity of 45% ^ -55% of the environment. 6.3 pairs only required test temperature, test temperature before the sample in the test time should not be less than half an hour parking; of a temperature and humidity requirements of the test, the test sample in the test environment before the parking time should not normally be less at 16h. 7. Test procedure 7.1 Measurement of the sample by measuring the length and width of the lap surface, accurate to 0. 05mm. 7.2 specimen symmetrically clip the upper and lower gripper, the grip at the end to the lap distance (50 ± 1) mm.. 7.3 start testing machine, at (5 ± 1) mm / min in order to stabilize the speed of loading. Record the maximum load the sample shear failure. Record type of bonding failure (cohesive failure, adhesive damage, metal damage). 8. Test results 8.1 metal adhesive tensile lap shear strength is calculated as follows: τ = P / (B × L) Where: τ an adhesive tensile shear strength, MPa; p - the sample shear failure of the maximum load, N; B - specimen width lap, mm; L - specimen length lap surface, mm. 8.2 Shear strength test results to the arithmetic mean of the maximum value, minimum value, said. Take three significant figures. 9. Test Report The test report shall include the following: a. adhesive type and batch number; b. the type of metal materials, thickness and surface treatment; c. Preparation of test pieces (without the tank plate, slotted plate, single) and the bonding process necessary to state; d. sample overlap length; e. number of samples; f. Test results (arithmetic mean, the maximum value, minimum value); g. damage type and number of samples; h. The average thickness of the layer; i. with the standard differences.
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