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Clamp and method for testing tensile shear creep of adhesive by cross method

A criss-cross, stretching and shearing technology, applied in the direction of testing material strength by applying stable shear force, testing material strength by applying stable tension/compression, measuring devices, etc., can solve errors and cannot be tensile load sheared Cut creep test and other issues to achieve the effect of reducing error, saving test cost and improving test efficiency

Pending Publication Date: 2020-12-18
CHINA TEST & CERTIFICATION INT GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the shortcoming of this test method is that since the support force and the downward pressure load are not on the same line, the tested part will have a tendency to rotate toward the vertical substrate, resulting in errors, and this phenomenon is more obvious when the adhesive layer is thicker
On the other hand, this method can only be tested by compressive load and cannot be used for shear creep test by tensile load

Method used

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  • Clamp and method for testing tensile shear creep of adhesive by cross method
  • Clamp and method for testing tensile shear creep of adhesive by cross method
  • Clamp and method for testing tensile shear creep of adhesive by cross method

Examples

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Embodiment 1

[0043] An embodiment of the present invention provides a fixture for testing the tensile shear creep of an adhesive by the cross method. The fixture is used in conjunction with an instrument that can provide tension to hold the Fixed criss-cross specimen.

[0044] like Figure 5 As shown, the crisscross sample 100 includes two bonded substrates and adhesives arranged in a crisscross pattern. For convenience of description, Figure 5The direction shown is a reference, and the two substrates to be bonded are respectively a horizontal substrate 200 and a vertical substrate 300, and the horizontal substrate 200 and the vertical substrate 300 are vertically bonded by an adhesive 400, and the horizontal substrate 200 and the vertical substrate The dimensions of the substrates 300 can be the same or different, and their materials can be the same or different, and the materials can be rigid solids such as metal, ceramics, glass, plastic, and wood.

[0045] like image 3 , 4 As sho...

Embodiment 2

[0072] The embodiment of the present invention provides a method of using the clamp of embodiment 1 to perform the tensile shear creep test of the adhesive, the method comprising:

[0073] S1: Measure the bonding interface area S of the adhesive in the cross sample and the length dimension X of the adhesive in the direction of the tensile load.

[0074] S is the bonding interface area between the substrate to be bonded and the adhesive, and X is the length of the adhesive in the direction of the tensile load. S and X can be measured by a steel ruler or a vernier caliper.

[0075] S2: Connect the first connection structure of the first clamping plate with the upper connection mechanism of the tensile instrument, embed the transverse base material in the cross sample in the first J-shaped hook groove, and make the cross sample The adhesive layer passes through the gap between the two first connecting parts, such as Figure 9 , 10 shown.

[0076] S3: The second clamping plate ...

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Abstract

The invention discloses a clamp and a method for testing tensile shear creep of an adhesive by a cross method, and belongs to the field of adhesive shear creep testing. A U-shaped first clamping platewith two J-shaped hook grooves in one end and a rectangular second clamping plate with a J-shaped hook groove in one end are used for forming a clamp, and a crossed sample is effectively fixed in theclamp. According to the invention, a crossed sample can be fixed, a shear creep test is carried out by using a tensile load, and rotation of the test piece caused by traction of the bonding layer iseliminated, so that the shear creep performance of the adhesive is more accurately tested, the clamp can be suitable for test pieces with different bonding layer thicknesses, clamps with different specifications do not need to be prepared, the test cost is reduced, and the test efficiency is improved, and the test efficiency is improved.

Description

technical field [0001] The invention relates to the field of adhesive shear creep testing, in particular to a fixture and a method for testing adhesive tensile shear creep by a cross method. Background technique [0002] Adhesives are widely used in the connection between various materials and components. Adhesives will inevitably creep due to long service life and constant stress. Therefore, it is necessary to test and characterize the creep performance of adhesives. The current Chinese national standard "GB / T 7750-1987 Adhesive Tensile Shear Creep Performance Test Method (Metal to Metal)" discloses a test method for adhesive tensile shear creep. The test sample is as follows figure 1 shown. This method is only applicable to the case where the adhesive layer is thin. For adhesives such as silicone weather-resistant adhesives and silicone structural sealants that require a certain thickness when used, this method cannot accurately measure their shear creep properties. On...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/04G01N3/08G01N3/24
CPCG01N3/02G01N3/04G01N3/08G01N3/24
Inventor 万德田林立尘包亦望宋晓辉田远王亮亮周建
Owner CHINA TEST & CERTIFICATION INT GRP CO LTD
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