A method for testing adhesive bonding properties of sheet substrates

Abstract

The invention discloses an adhesive bonding performance testing device for a sheet-shaped base material, which comprises: a sheet-shaped base material; a loading block, which is used to bond and fix the sheet-shaped base material to form a test assembly; The tensile test assembly loading assembly includes a testing machine loading connector, a test assembly connector and a connecting device; wherein, the connecting device, the test assembly connector and the testing machine loading connector are connected in sequence; the test assembly is connected to the test assembly connecting part through the connecting device Connected, the testing machine loads the connector and connects with the testing machine for tensile fracture failure test. The invention also discloses a method for testing the bonding performance of the adhesive used for sheet substrates and an empirical correction method. The invention has the advantages of simple structure, convenient operation, and can effectively test and evaluate the bonding performance of a certain adhesive with respect to sheet substrates, and can also conduct any test components based on tensile-shear combination. test features.

Description

technical field [0001] The invention relates to the field of adhesive performance testing, in particular to a method for testing the adhesive bonding performance of sheet substrates. Background technique [0002] Adhesive technology is a material connection technology commonly used in engineering. Compared with traditional welding, riveting, bolting and other connection methods, the bonding technology has the advantages of simple process, cost-effectiveness, reduced body weight, reduced energy consumption, slow vibration and noise reduction, relatively uniform stress distribution on the joints, and a wide range of applicable materials And it can realize connection of dissimilar materials, neat appearance and many other advantages. [0003] In recent years, with the rapid development of adhesives and people's higher and higher requirements for vehicle comfort, safety, and lightweight, the application of adhesive technology in automobile manufacturing has become increasingly ...

AI Technical Summary

Problems solved by technology

It is easy to cause the load on the bonding area to be not pure shear, and a relatively complicated stress state appears, which cannot be used as a basis for evaluating the bonding performance of the adhesive under the state of pure shear stress

For this reason, the present invention designs a loading block made of aluminum alloy, which ensures that the specimen does not bend and deform during the test, and the load acting on the bonding surface does not change. At the same time, it is considered that some materials are processed into Large-sized block test pieces are not only difficult to operate, but also increase the cost of the test and easily cause waste. Therefore, these materials are processed into sheet-shaped substrates, and the sheet-shaped substrates are bonded on the aluminum alloy loading block to achieve the test adhesive. The purpose of adhesive performance with respect to sheet substrates

[0006] However, in the peel test, the adhesive layer is mainly subjected to tensile stress, which cannot fully reflect the bonding performance of the adhesive under the combined tension-shear stress state widely existing in the body structure.

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