Test device and test method for building structural adhesive bonding tensile stress relaxation
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A technology of building structural glue and tensile stress, which is applied to measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problems of data discontinuity and other issues, and achieve the effect of ensuring accuracy
Active Publication Date: 2014-12-24
CHINA TEST & CERTIFICATION INT GRP CO LTD
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[0003] However, there are two limitations in these existing technologies: (1) the problem of bonding the specimen
In actual engineering, the structural adhesive is also affected by the weight of the glass, and will also bear a shear stress at the bonding interface; (2) The problem of continuous monitoring
The existing test technology can only obtain the change of the bonding performance of the structural adhesive after a certain aging period, and the obtained data is discontinuous, and there are certain deficiencies in the evaluation of its aging resistance and life evaluation
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Embodiment 1
[0069] Embodiment 1: test the stress relaxation coefficient of glass and fluorocarbon sprayed aluminum alloy bonding substrate
[0070] Specimen: Use glass and bonded base material fluorocarbon sprayed aluminum alloy, prepare and maintain the specimen according to step 1 (S1), and connect the specimen to the fixture through the upper and lower clamps.
[0071] Among them, the substrate specimen is bonded with fluorocarbon sprayed aluminum alloy, with a cross-section of 12mm×10mm; the bonded specimen is glass, with a size of 100mm×12mm×5mm;
[0072] The structural adhesive is: two-component silicone structural adhesive, the size of the bonding surface is: 12mm×5mm,
[0073] Initial tensile force F 0 For: 200N; Aging conditions: Natural placement in the laboratory at room temperature, the temperature is (23±2) ℃, relative humidity is (50±5)%; Aging time: 7 days,
[0074] The result of the test: the tensile force value F measured after 7 days t 120N, the result of evaluating t...
Embodiment 2
[0075] Embodiment 2: the stress relaxation coefficient of test glass and fluorocarbon sprayed aluminum alloy bonding substrate
[0076] Adopt aging box, other conditions are the same as embodiment 1.
[0077] Put the same specimen in an aging box at 40°C for 7 days, and measure the tensile force value F t is 30N, then the tensile stress relaxation coefficient at this time is reduced, which is R t =F t / F 0 =30N / 200N=0.15. It can be seen that the internal cohesion of the structural adhesive decreases under the condition of high temperature aging-stress coupling.
[0078] The testing device and testing method of the present invention can also be used for tensile stress relaxation testing of other adhesive sealing materials, such as building sealants and the like.
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Abstract
The invention provides a test device and a test method for testing building structural adhesive bonding tensile stress relaxation. The test device comprises a fixed support, a tensioning device, a test piece, a fixture and a digital dynamometer, wherein the test piece is detachably mounted on the fixture and receives the tensile force from tensioning device through the fixture. The test method comprises the steps as follows: the cured test piece is assembled on the test device; a turnbuckle of the tensioning device is rotated to adjust the force applied to the test piece; the test device is entirely placed on an outdoor natural exposure field or selectively placed in a manual ageing chamber, so that the tensile stress under the corresponding ageing condition can be measured; the tensile stress after ageing is compared with the tensile stress before ageing, so that the tensile stress relaxation coefficient can be obtained. By the aid of the test device and the test method, building structural adhesive bonding tensile stress relaxation after various ageing tests can be tested, changes of the tensile stress can be monitored in real time, and a means is provided for evaluation of the bonding ageing durability and prediction of the service life of a building structural adhesive.
Description
technical field [0001] The invention belongs to the technical field of building structure adhesive testing, and in particular relates to a testing device and a testing method for testing building structural adhesive bonding tensile stress relaxation. Background technique [0002] Building structural adhesive (hereinafter referred to as structural adhesive) is a commonly used structural bonding material in construction. It is generally used for glass installation in building curtain walls and doors and windows. It has high bonding strength and can firmly bond glass to metal attached frames. In addition, it also has good aging resistance. At present, the evaluation of the aging resistance of structural adhesives is mainly by testing the changes in the tensile bond strength of bonded specimens after low temperature, high temperature, water immersion and load cycles, etc., to characterize the structural adhesive’s resistance to external environmental factors. Aging performance,...
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