Method for detecting interface contact strength by double frequency ultrasound

A technology of contact strength and dual-frequency ultrasound, which is applied to the analysis of solids using sound waves/ultrasonic waves/infrasonic waves, material analysis using sound waves/ultrasonic waves/infrasonic waves, and measurement devices, which can solve the problem of inability to perform good correspondence and quantitative measurement interfaces. contact strength etc.

Inactive Publication Date: 2011-01-19
NANJING UNIV
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Problems solved by technology

However, due to the lack of calibration and quantitative analysis of the vibration amplitude, the theoretical analysis and the experimental results cannot actually correspond well, which means that the contact strength of the interface cannot be quantitatively measured.

Method used

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  • Method for detecting interface contact strength by double frequency ultrasound
  • Method for detecting interface contact strength by double frequency ultrasound
  • Method for detecting interface contact strength by double frequency ultrasound

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Embodiment Construction

[0048] Two kinds of sample materials used in the present invention, one is aluminum alloy, its density and sound velocity are respectively 2708.3 kg / cubic meter and 6030.5 m / s after measurement; kg / m3 and 5916.3 m / s. Among them, for the aluminum alloy samples, the situations with and without Vaseline coupling at the interface were studied respectively. The size of the contact surface of all samples is 30mm×30mm, and the thickness (dimension in the ultrasonic propagation direction) is 5mm.

[0049] Such as figure 1 As shown, first use an arbitrary function signal generator (Agilent 33250A, USA) to repeatedly generate an electric pulse containing two frequency sinusoidal components of 500 kilohertz (kHz) and 800 kHz, the pulse repetition frequency is 100 Hz, and the waveform duration is for 80 microseconds. In order to suppress the side lobe in the frequency domain, a Hanning window function was added to the electrical pulse. The electrical signal was passed through a 55 dB ...

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Abstract

The invention provides a method for detecting interface contact strength by double frequency ultrasound, which mainly comprises the following steps of: generating double frequency ultrasound exciting signals by using a signal generator, and amplifying by using a power amplifier; transmitting the signals by utilizing a transmitting transducer, receiving the signals by utilizing a receiving transducer after the transducers are calibrated; exciting the double frequency ultrasonic signals in a sample to be detected, and processing the signals by utilizing fast Fourier transform; converting the obtained electric signal amplitude into the absolute displacement amplitude; and calculating a nonlinear parameter, a linear contact strength value and a second-order contact strength value. A calibration procedure for absolute vibration amplitude is introduced, and the concrete contact strength value can be calculated, so the quantitative detection on a solid interface can be realized. The double frequency ultrasound is adopted for detection; and compared with the conventional solid interface contact strength ultrasound detection method, the technology can effectively enhance the detection for the contact strength of the solid interface.

Description

technical field [0001] The invention relates to a method for detecting interface contact strength, in particular to a method for detecting interface contact strength by using dual-frequency ultrasonic waves. Background technique [0002] In the non-destructive testing of connection quality such as bonding and welding of solid interfaces, ultrasonic means play an increasingly important role due to its advantages of low cost and easy operation. Due to the ability to distinguish defects, cracks, debonding, and interfacial impurities in composite materials or composite structures that affect the connection strength, ultrasonic nondestructive testing has been widely used in the fields of construction, electronics, automobiles, aviation, shipbuilding, and machinery. more and more widely applied. Compared with the application of quantitative ultrasonic technology in other aspects, solid nondestructive testing requires that it not only reflect the physical properties of the sample ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/30
Inventor 郭霞生章东刘洋
Owner NANJING UNIV
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