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Ultrasonic nondestructive evaluation of early-stage fatigue damage of bonding interface

A fatigue damage and bonding technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, and processing the response signals of detection, which can solve the problems of insensitivity to the degradation of mechanical properties and achieve the effect of safe avoidance.

Inactive Publication Date: 2013-09-04
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, these parameters are very insensitive to the degradation of the early mechanical properties of the material and structure

Method used

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  • Ultrasonic nondestructive evaluation of early-stage fatigue damage of bonding interface
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  • Ultrasonic nondestructive evaluation of early-stage fatigue damage of bonding interface

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0030] 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, an ultrasonic excitation device 5, and an ultrasonic receiving device 7. The model of oscilloscope 1 is TDS3034B, the model of host 2 is Ritec SNAP-0.25-7-G2, and the model of pre-attenuation and low-pass filter module 4 is RLP-2. 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 ultrasonic transducer 5, and the ultrasonic transducer The signal of the oscilloscope is connected to the receiver B of the host 2, and the signal monitoring port C of the ho...

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Abstract

The invention relates to an ultrasonic nondestructive evaluation of the early-stage fatigue damage of a bonding interface, and relates to a method for evaluating the early-stage fatigue damage of the bonding interface by utilizing an ultrasonic detecting technology. The method comprises the following steps: selecting a test specimen with a bonding structure; measuring the initial nonlinear coefficient of the bonding interface by utilizing a nonlinear ultrasonic testing system; carrying out the tensile fatigue loading on the test specimen and performing nonlinear ultrasonic testing for every thirty times until the test specimen is damaged; dividing the number of the final fatigue loading times by the number of the fatigue loading times, so as to obtain the value of the relative fatigue life; dividing the initial nonlinear coefficient by the nonlinear coefficient, so as to perform normalization; then repeating the operations by selecting another four test specimens; and by taking the normalized nonlinear coefficient as the y-coordinate and the value of the relative fatigue life as the x-coordinate, expressing the normalized nonlinear coefficient values of the five test specimens in the coordinate, so as to obtain a fitting relationship curve chart of the normalized nonlinear coefficient and the relative fatigue life, wherein the greater the normalized nonlinear coefficient is, the more serious the fatigue damage degree of the bonding interface is.

Description

technical field [0001] The invention relates to an ultrasonic nondestructive evaluation method for early fatigue damage of a bonding interface, belonging to the technical field of ultrasonic nondestructive testing. Background technique [0002] Bonding is a process that uses adhesives to produce mechanical bonding, physical adsorption, and chemical bonding on the joint surface to connect two adhesive parts. Bonding is not only suitable for the same material, but also for dissimilar materials, and has a wide range of applications in many industrial fields. For example, in the field of aviation industry, after using the bonding process, due to the reduction of metal joints, the weight of the parts can be reduced by 20-25% compared with riveting or welding, the strength is increased by 30-35% compared with riveting, and the fatigue strength is increased by 10 times compared with riveting. Therefore, the fuselage, wings, and rudder surfaces of modern aircraft use a large number...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/12G01N29/44
Inventor 税国双汪越胜黄蓬
Owner BEIJING JIAOTONG UNIV
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