A METHOD FOR EVALUATING THE CONTACT PROPERTIES OF SOLID-SOLID INTERFACE USING NONLINEAR EFFECT

Abstract

The invention discloses a method for evaluating the contact characteristics of a solid-solid interface by using nonlinear effects, comprising the following steps: S01, establishing an isotropic solid-solid bonding interface model; S02, using a perturbation method to deduce the expression of reflected waves and transmitted waves formula; S03, define four nonlinear parameters to evaluate the contact characteristics of the solid-solid bonding interface; S04, draw the curve of the four nonlinear parameters changing with the contact stress; S05, use the ultrasonic signal generator to select the excitation signal mix S06, through the fast Fourier transform of the collected signal to obtain the corresponding spectrum image, measure the nonlinear parameters of the specimen under different pressures; S07, analyze and obtain the nonlinear parameters by comparing the theoretical value with the actual value There is a monotonic relationship between the parameter and the bond strength of the specimen. The invention provides a method for evaluating the contact characteristics of solid-solid interface by utilizing nonlinear effects, which can better evaluate the bonding strength and contact condition of the adhesive interface, and more effectively monitor and maintain the quality of the adhesive.

Description

technical field [0001] The invention relates to a method for evaluating the contact characteristics of a solid-solid interface by using a nonlinear effect, and belongs to the technical field of ultrasonic testing and analysis. Background technique [0002] Bonding is a method of connecting materials together to form components. Bonding components have a series of features such as no stress concentration, good fatigue resistance, light structure, avoiding electrochemical reaction of metal connections, and connecting objects with complex shapes. Advantages, it has been widely used in aerospace, electronics, medical equipment, wood, construction and other industries. [0003] However, in the production process of bonded parts, various micro-defects are inevitably formed inside the adhesive or at the bonding interface. Affected by its formation process and working environment, metal materials and their bonding structures are prone to a variety of early mechanical properties deg...

AI Technical Summary

Problems solved by technology

However, in practical applications, the detection signal needs to reduce the nonlinear interference of noise first, and at the same time, the ultrasonic wave will be severely attenuated when passing through the defect, which makes the linear parameter change not obvious, which directly leads to the unsatisfactory flaw detection effect

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