Method for ultrasonic nondestructive measurement of thickness of plate

A sheet metal and ultrasonic technology, applied in the field of non-destructive testing, can solve problems such as errors and large measurement errors, and achieve the effect of overcoming large errors

Inactive Publication Date: 2020-02-21
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for plates with uneven sound velocities at various positions, the traditional method has a large measurement error, especially for materials with large uneven sound velocities such as resin matrix composites, metal matrix composites, and ceramic matrix composites. There is a large error in the method of thickness measurement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] For carbon fiber reinforced resin matrix composite panels with a maximum thickness of 5mm, the thickness measurement steps are as follows:

[0028] 1.1 Sample requirements and placement

[0029] Place the carbon fiber-reinforced resin-based composite material plate in the water tank. When placing it, ensure that the thickness direction of the plate is perpendicular to the horizontal plane. so that the distance from the bottom of the tank is 1mm, and the bottom of the tank is flat;

[0030] 1.2 Connecting Devices

[0031] The output interface and synchronous interface of the pulse signal generator are respectively connected with the input interface and synchronous interface of the multi-channel digital oscilloscope through coaxial cables; / Receiving interface; the probe is installed on the scanning frame capable of three-axis coordinated movement, control the position of the probe, make it enter the water and keep the distance between the probe and the upper surface of...

Embodiment 2

[0039] For fiber particle reinforced aluminum matrix composite panels with a maximum thickness of 30 mm, the thickness measurement steps are as follows:

[0040] 1.1 Sample requirements and placement

[0041] Place the fiber particle reinforced aluminum matrix composite material plate with a maximum thickness of 30mm in the water tank. When placing it, ensure that the thickness direction of the plate is perpendicular to the horizontal plane. After the installation is completed, the distance between the water surface in the water tank and the upper surface of the sample to be tested is 100. pad the sample so that the distance from the bottom of the water tank is 5mm, and the bottom of the water tank is flat;

[0042] 1.2 Connecting Devices

[0043] The output interface and synchronous interface of the pulse signal generator are respectively connected with the input interface and synchronous interface of the multi-channel digital oscilloscope through a coaxial cable; the longit...

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Abstract

The invention belongs to the field of nondestructive detection and relates to a method for the ultrasonic nondestructive measurement of the thickness of a plate. The defect that an existing ultrasonicplate thickness measuring method is only suitable for a plate with uniform sound velocity is overcome. The thickness measurement and thickness imaging of a plate with non-uniform sound velocity are achieved, and the method is especially suitable for thickness nondestructive measurement of a resin-based composite plate, a metal-based composite plate, a ceramic-based composite plate and other plates with non-uniform sound velocities and is also suitable for the thickness measurement of the plate with uniform sound velocity.

Description

technical field [0001] The invention relates to an ultrasonic non-destructive measurement method for plate thickness, which can be applied to plates with uneven sound velocity and can also be used for plate thickness measurement with uniform sound velocity, and belongs to the field of non-destructive testing. Background technique [0002] The traditional ultrasonic method of measuring the thickness of the plate measures the thickness of the plate by measuring the time difference between the ultrasonic echoes on the upper surface and the lower surface of the plate and then multiplying it by a fixed sound velocity. The ultrasonic echo time difference is proportional. However, for plates with uneven sound velocities at various positions, the traditional method has large measurement errors, especially for materials with large uneven sound velocities such as resin matrix composites, metal matrix composites, and ceramic matrix composites. There is a large error in the method of t...

Claims

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Application Information

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IPC IPC(8): G01B17/02G01N29/04G01N29/07G01N29/44
CPCG01B17/02G01N29/04G01N29/07G01N29/44G01N2291/011G01N2291/02854
Inventor 王晓史亦韦梁菁何方成史丽军
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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