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Nonlinear ultrasonic evaluation method of metal material plating damage

A nonlinear ultrasonic, metal material technology, used in the analysis of solids using sonic/ultrasonic/infrasonic waves

Inactive Publication Date: 2012-08-01
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the non-destructive evaluation of coating damage by using the nonlinear effect of ultrasonic waves has not been reported yet.

Method used

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  • Nonlinear ultrasonic evaluation method of metal material plating damage
  • Nonlinear ultrasonic evaluation method of metal material plating damage
  • Nonlinear ultrasonic evaluation method of metal material plating damage

Examples

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0054] Non-linear ultrasonic testing systems such as figure 1 As shown, it includes: an oscilloscope 1, a host computer 2, a computer 3, a pre-attenuation and low-pass filter module 4, a Rayleigh wave excitation device 5, a Rayleigh wave receiving device 7, and a high-pass filter module 8. The model of oscilloscope 1 is TDS3034B, the model of host 2 is Ritec SNAP-0.25-7-G2, the model of pre-attenuation and low-pass filter module 4 is RLP-2, and the model of high-pass filter module 8 is RHP-4. Utilize the coaxial cable to connect the signal output terminal A of the host computer 2 with the input terminal of the pre-attenuation and low-pass filter module 4, and the output terminal of the pre-attenuation and low-pass filter module 4 is connected with the Rayleigh wave excitation device 5, Rayleigh One signal of the wave receiving device 7 is con...

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Abstract

The invention provides a nonlinear ultrasonic evaluation method of metal material plating damage, which relates to metal material plating damage testing so as to determine the damage degree of the plating. The method comprises the following steps of: selecting a plating test piece; testing the plating test piece by using a nonlinear ultrasonic testing system so as to obtain an initial relative nonlinear coefficient; carrying out loading on the plating test piece for five times so as to obtain five loaded stresses; carrying out nonlinear ultrasonic testing on the five loaded plating test pieces so as to obtain five relative nonlinear coefficients; dividing the relative nonlinear coefficients by the initial relative nonlinear coefficient so as to regularize the relative nonlinear coefficients as vertical coordinates; representing the initial and five regularized relative nonlinear coefficient values in a coordinate by using the stresses as horizontal ordinates so as to obtain a relationship curve diagram between the regularized relative nonlinear coefficients and the stresses, wherein damage exists in the plating test piece during regularizing the relative nonlinear coefficient of more than 1 and less than the regularized relative nonlinear coefficient when the plating has a crack; and the larger the relative nonlinear coefficient is and the larger the damage degree is.

Description

technical field [0001] The invention relates to a nonlinear ultrasonic evaluation method for coating damage of metal materials, which belongs to the technical field of testing. Background technique [0002] Electroplating is the process of plating a thin layer of other metals or alloys on the surface of certain metals using the principle of electrolysis. It is a process of using electrolysis to attach a layer of metal film to the surface of metal or other material parts to prevent corrosion and improve Abrasion resistance, conductivity, light reflection and aesthetic enhancement. However, since the electroplated covering layer is different from the base material, it will cause partial separation and peeling of the covering layer and the base material during use, which will affect the performance. Therefore, how to conduct ultrasonic non-destructive evaluation on these covering layers whose thickness accounts for only a few hundredth to a few tenths of the overall thickness ...

Claims

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Application Information

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IPC IPC(8): G01N29/12
Inventor 税国双汪越胜陈阿丽
Owner BEIJING JIAOTONG UNIV
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