Method and device for testing acoustic performance of ultrathin polyethylene test sample

Abstract

The invention relates to the test of acoustic performance of polyethylene test samples and provides a method and a device for testing acoustic performance of an ultrathin polyethylene test sample. An impulse reflection device based on immersion focusing technology comprises an ultrasonic detector, a test container, a clamping device and a focusing probe. The method for testing acoustic performance of ultrathin polyethylene test sample comprises the following steps: preparing an ultrathin polyethylene test sample to be tested; immersing the ultrathin polyethylene test sample in coupling liquid, and blending the coupling liquid until the ultrasonic detector receives no echo signal; calculating the sound velocity and acoustic impedance of the coupling liquid, wherein the acoustic impedance of the coupling liquid is the acoustic impedance of the ultrathin polyethylene test sample; and calculating the sound velocity of the ultrathin polyethylene test sample. The contact interface coupling problem of ultrasonic and test sample does not need to be considered in the method disclosed by the invention, so that the method is suitable for measuring the acoustic impedance of ultrathin test samples with irregular surfaces, and the precision of the test result is high.

Description

technical field [0001] The invention relates to testing the sound performance of polyethylene samples, in particular to a testing method and device for the sound performance of ultra-thin polyethylene samples. Background technique [0002] Sound velocity and acoustic impedance are important acoustic performance parameters of materials. The sound velocity and acoustic impedance can not only directly reflect the elastic modulus of the material, but also have a specific relationship with the structural characteristics of the material, damage and aging properties. In recent years, polyethylene pipes have been widely used in important livelihood fields such as gas transportation and drinking water transportation, and even gradually to key energy fields such as nuclear power plants. Therefore, ultrasonic testing and safety assessment technologies for polyethylene products have received more and more attention. In the ultrasonic testing process of polyethylene products, the measur...

AI Technical Summary

Problems solved by technology

[0005] In addition, the ultra-thin polyethylene samples to be tested are often irregular in shape. Even if a thin plate sample can be machined, it is difficult to achieve a smooth surface and uniform thickness of the sample.

The sound performance test of such a sample not only needs to consider the acoustic coupling and other issues, but also it is difficult to measure from which position the ultrasonic wave penetrates the sample. Unless the thickness of the entire sample is uniform, it is also difficult to accurately measure the material speed of sound

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