Device and method for testing bonding shearing strength of structural adhesive interface
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A shear strength and interfacial bonding technology, which is applied in the measurement device, the use of a stable shear force to test the strength of materials, and the preparation of samples for testing, etc. The accuracy of the test results, the inclination of the crisscross specimens, etc., are easy to maintain stability, easy to operate, and avoid torsion or eccentricity.
Active Publication Date: 2014-11-05
北京玻钢院检测中心有限公司
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However, the above method is not suitable for evaluating the shear performance of silicone structural adhesives for doors, windows and curtain walls, because according to the requirements of JGJ 102-2003 "Technical Specifications for Glass Curtain Wall Engineering", the bonding width of silicone structural adhesives The junction thickness should not be less than 6mm. For bonded samples with a certain adhesive layer thickness, the cross-shaped sample will generate a certain torsional load when pressurized due to the influence of the adhesive layer thickness, and the cross-shaped specimen will tilt, which will affect the test. accuracy of results
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Embodiment 1
[0064] Example 1: Structural adhesive interface normal temperature bond shear strength test:
[0065] Sample: Double-sided cross-type test device S, in which,
[0066] Adhesive substrate test piece 1 is an aluminum alloy profile of 12mm×12mm×100mm,
[0067] Bonded specimen 2 is common float glass of 12mm×12mm×100mm,
[0068] The structural glue is: one-component silicone structural glue, the coating thickness is 6mm, and the coating area is 12mm×12mm.
[0069] The result of the test, the shear strength σ c =1.82MPa, the design requirement (Table 1) is not less than 1.5MPa, which meets the design requirement.
Embodiment 2
[0070] Example 2: Bond shear strength test after structural adhesive aging:
[0071] Sample: Double-sided cross-type test device S, in which,
[0072] Adhesive substrate test piece 1 is an aluminum alloy profile of 12mm×12mm×100mm,
[0073] Bonded specimen 2 is common float glass of 12mm×12mm×100mm,
[0074] The structural glue is: one-component silicone structural glue, the coating thickness is 6mm, and the coating area is 12mm×12mm.
[0075] Aging treatment of the double-sided cross-type test device S: take it out after soaking in a water bath at (45±1)°C for 21 days, and test it after placing it at room temperature for 1 day.
[0076] The result of the test, the shear strength σ c = 1.13MPa, the design requirement (Table 1) is that the shear strength after aging is not less than 1.4MPa, which does not meet the design requirement.
[0077] Comparative Test:
[0078] Specimen: single-sided cross-shaped specimen, in which,
[0079] The bonded substrate specimen is an alu...
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Abstract
The invention relates to a device and method for testing bonding shearing strength of a structural adhesive interface. The device comprises a bonding base material testing piece and two bonded testing pieces, wherein the bonding base material testing piece and the two bonded testing pieces are bonded in a crisscross manner by using a structural adhesive, the two bonded testing pieces are mutually parallel and are located at two sides of the bonding base material testing piece, the respective centers of the two bonded testing pieces and the bonding base material testing piece are located on the same straight line, a compression load is applied to the bonding base material testing piece to ensure that shear stress can be generated on a bonding interface of two materials, and the bonding shearing strength of the interface is calculated through the shear stress generated during damaging. The device and the method for testing the bonding shearing strength of the structural adhesive interface are suitable for testing the bonding shearing strength of the interface among different materials with certain bonding layer thicknesses, and especially suitable for evaluating the bonding strength of the structural adhesive between glass of a curtain for doors and windows of a building and a metal base material.
Description
technical field [0001] The invention belongs to the technical field of material mechanical property testing, relates to a device and a test method for testing the bonding shear strength of material interfaces, and in particular relates to a device for evaluating the bonding shear strength of structural adhesive interfaces used for building doors, windows, curtain walls and insulating glass. and test methods. Background technique [0002] Building structural adhesive (hereinafter referred to as structural adhesive) can withstand large loads, and has good aging resistance, fatigue resistance, corrosion resistance and other properties. It has stable performance within the expected life and is suitable for structural bonding of stressed components. In the field of building doors, windows and curtain walls, the commonly used structural adhesive is silicone structural adhesive, which is used for the bonding of insulating glass and the bonding between glass and metal substrates. S...
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