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Test device and test method for tensile stress relaxation of adhesive bonds in building structures

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: 2016-09-14
CHINA TEST & CERTIFICATION INT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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

Method used

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  • Test device and test method for tensile stress relaxation of adhesive bonds in building structures
  • Test device and test method for tensile stress relaxation of adhesive bonds in building structures
  • Test device and test method for tensile stress relaxation of adhesive bonds in building structures

Examples

Experimental program
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Effect test

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 the relaxation of building structure adhesive tensile stress, the test device includes a fixed bracket, a tensile device, a test piece, a fixture and a digital force measuring instrument, and the test piece can be loaded and unloaded It is installed on the fixture and receives the tension from the tensioning device through the fixture. The test method provided by the present invention comprises the steps of assembling a well-cured test piece into a test device, rotating the turnbuckle of the stretching device to adjust the stress of the test piece, and placing the test device as a whole in an outdoor natural exposure field or an optional artificial aging box. The tensile stress under corresponding aging conditions is measured, and the tensile stress relaxation coefficient can be obtained by comparing the tensile stress after aging with the tensile stress before aging. The invention can relax the tensile stress of building structure glue bond after various aging experiments, can monitor the change of tensile stress in real time, and provides means for evaluating the aging durability of building structure glue bond and predicting the service life.

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,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/02
Inventor 刘正权陈璐张庆华杜大艳梁慧超吴蔚代铮于鸿雁仉娜张晓丹王慧英
Owner CHINA TEST & CERTIFICATION INT GRP CO LTD
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