Method for testing bending strength of ultra-thin glass

Abstract

The invention discloses a method for testing strength of ultra-thin glass. The method comprises the following steps: obtaining elasticity modulus of an object; fixing the object with to-be-tested ultra-thin glass together, and forming a combined object sample; measuring the corresponding force value of the combined object sample at glass breakage moment through an existing glass strength testing method, substituting the force value into a given calculation formula, thereby obtaining the bending strength of the ultra-thin glass, wherein the object refers to a standard beam or a block. The experimental method disclosed by the invention is simple, easy in sample preparation, accurate in test data and high in operability. With the adoption of a test sample prepared by the method, the strength test can be directly finished according to the existing glass strength testing method and instrument.

Description

technical field [0001] The invention belongs to the technical field of glass mechanical performance testing, in particular to a method for testing the bending strength of ultra-thin glass. Background technique [0002] In recent years, thin glass and ultra-thin glass have been increasingly used in the fields of electronics, communications, and building photovoltaics, which has attracted widespread attention and high interest from the glass industry at home and abroad, and has become one of the major directions for future development. Due to its very thin thickness, ultra-thin glass is more susceptible to damage and fracture under environmental loads such as vibration, shock, static load and thermal shock. Ultra-thin glass must have sufficient strength to ensure its safe and reliable application, and strength performance testing is one of the key parameters for ultra-thin glass performance testing. [0003] At present, the existing glass strength testing methods include thre...

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Problems solved by technology

However, the strength calculation formulas provided by these methods are based on the premise of small deformation conditions, that is, the deformation scale of the glass component under the action of external force is much smaller than the original size (a few thousandths or ten thousandths), see Figure 1a , where the deflection line 102 of the glass after deformation is smaller than the baseline 101 of the glass before deformation. For thicker glass (such as thickness greater than 2 mm), the calculation formula is sufficient to meet the accuracy requirements, but for thin glass and ultra-thin glass (thickness less than 2mm), according to the existing glass strength test methods and standards, the bending deflection of the sample before the glass breaks is much greater than the glass thickness, which belongs to the large deformation, see Figure 1b , where the deflection line 102 after deformation is very obvious compared with the glass baseline 101 before deformation. At this time, according to the calculation formula given by the small deformation theory, there will be obvious deviations in the results

In addition, there are still nonlinear problems in the bending of ultra-thin glass, and the static analysis is very complicated, and there is no accurate theoretical analysis solution at present. Therefore, the existing glass strength testing methods are not suitable for ultra-thin glass strength testing

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