CN-115015383-B - Method and device for detecting dry sleeve, computer equipment and storage medium

CN115015383BCN 115015383 BCN115015383 BCN 115015383BCN-115015383-B

Abstract

The present application relates to a method, apparatus, computer device, storage medium and computer program product for dry casing inspection. The method comprises the steps of conducting ultrasonic scanning test on a plurality of dry casing samples to be detected to determine a first scanning result, wherein the first scanning result is used for indicating whether each sample in the dry casing samples to be detected is damaged or not, determining a target sample and a damage area of the target sample according to the first scanning result, wherein the target sample is the sample with damage in the dry casing samples to be detected, conducting X-ray scanning test on a fault of the damage area to obtain a second scanning result, and the second scanning result is used for indicating damage condition of the target sample. The technical effects of rapidly positioning the damage position and accurately measuring the damage condition inside the material can be achieved by integrating the advantages that the damage position can be conveniently and rapidly positioned by ultrasonic scanning and the damage degree can be accurately reflected by X-ray scanning.

Inventors

ZHANG JINYIN
WEI XIAOXING
LIU QINGSONG
DENG RAN

Assignees

中国南方电网有限责任公司超高压输电公司检修试验中心

Dates

Publication Date: 20260505
Application Date: 20220516

Claims (8)

1. A method of testing a dry cannula, the method comprising: performing ultrasonic scanning test on a plurality of dry sleeve samples to be detected to determine a first scanning result, wherein the first scanning result is used for indicating whether each sample in the dry sleeve samples to be detected is damaged or not; Determining a target sample and a damaged area of the target sample according to the first scanning result, wherein the target sample is a sample with damage in the plurality of dry sleeve samples to be detected; Performing a graded load-holding test on the target sample, wherein the load gradient of the graded load-holding test is obtained according to the maximum breaking load obtained by performing a tensile test on any one sample among non-target samples in the plurality of dry casing samples to be detected, performing an acoustic emission test on the target sample in each graded load-holding test stage, dividing a time interval in each graded load-holding test stage, performing graded interpolation fitting to obtain a first test result, wherein the first test result is represented by a curve of accumulated energy change trend along with time, and the slope of the curve is positively correlated with a damage level, and Performing X-ray scanning test on the fault of the damaged area in each stage of the grading load-holding test to obtain a second scanning result, wherein the second scanning result is used for representing the damage condition of the target sample, and the second scanning result is a two-dimensional gray level image with cracks; Performing convolution filtering processing on the two-dimensional gray image to obtain a two-dimensional gray image with noise removed, performing high-hat transformation and low-hat transformation on the two-dimensional gray image with noise removed, performing binarization processing to obtain a processed two-dimensional gray image, and performing three-dimensional reconstruction processing on the processed two-dimensional gray image to obtain a three-dimensional image of the second scanning result; And determining the damage level of the target sample according to the crack condition presented in the three-dimensional image of the second scanning result and the first test result, wherein the crack condition is positively related to the damage level.
2. The method of claim 1, wherein the ultrasonic scan test is performed in a point scan mode, a line scan mode, or a surface scan mode.
3. The method of claim 1, wherein the first scan result is a gray scale image.
4. The method of claim 1, wherein the ultrasound scanning test uses water as a couplant.
5. The method of claim 1, wherein the non-target specimen is stretched using a universal proof machine to obtain a maximum breaking load.
6. A dry cannula testing device, the device comprising: The system comprises a first testing module, a first scanning module, a second testing module and a first testing module, wherein the first testing module is used for carrying out ultrasonic scanning test on a plurality of dry sleeve samples to be detected and determining a first scanning result; The processing module is used for determining a target sample and a damaged area of the target sample according to the first scanning result, wherein the target sample is a sample with damage in the plurality of dry sleeve samples to be detected; The second test module is used for carrying out a grading load-holding test on the target sample, wherein the load gradient of the grading load-holding test is obtained according to the maximum damage load, and the maximum damage load is obtained by carrying out a tensile test on any one sample in non-target samples in the plurality of dry sleeve samples to be detected; the method comprises the steps of carrying out acoustic emission testing on a target sample in each grading and load-holding test stage, dividing a time interval in each grading and load-holding test stage, carrying out segmentation low-order interpolation fitting to obtain a first test result, carrying out positive correlation on the slope of a curve and a damage level through curve representation of accumulated energy change trend, carrying out X-ray scanning testing on a fault of a damage area in each grading and load-holding test stage to obtain a second scanning result, wherein the second scanning result is used for representing damage condition of the target sample, the second scanning result is a two-dimensional gray level image with a crack, carrying out convolution filtering processing on the two-dimensional gray level image to obtain a two-dimensional gray level image with noise removed, carrying out cap conversion and cap conversion, carrying out binarization processing on the two-dimensional gray level image after noise removal to obtain a two-dimensional gray level image after processing, carrying out three-dimensional reconstruction processing on the two-dimensional gray level image after processing to obtain a three-dimensional image of the second scanning result, and carrying out three-dimensional reconstruction processing on the three-dimensional gray level image after processing, and obtaining a three-dimensional image of the second scanning result, and carrying out positive correlation on the damage condition of the crack and the target sample according to the damage condition in the second scanning result and the three-dimensional damage condition.
7. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any one of claims 1 to 5 when the computer program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 5.

Description

Method and device for detecting dry sleeve, computer equipment and storage medium Technical Field The present application relates to the field of composite material detection technology, and in particular, to a method, an apparatus, a computer device, a storage medium, and a computer program product for detecting a dry casing. Background The mechanical properties of the dry sleeve capacitance core material have an important influence on the service life and safety of the sleeve during application. Currently, there is relatively little research on the mechanical performance testing and internal damage characteristics of dry sleeve core composites. The conventional mechanical performance test, such as tensile test and bending test, can reflect macroscopic damage load, stress-strain curve and other information, but the internal tiny damage change cannot be accurately reflected. The detection modes of microscopic damage in the material can be divided into two types, namely, damage detection and nondestructive detection. The damage detection such as a scanning electron microscope needs to cut the section of the material to prepare a sample, and the method can damage the material and is not suitable for researching the damage in the dry-type sleeve capacitor core. Nondestructive testing can detect internal damage to the material without damaging the material. The ultrasonic detection method is a common nondestructive detection method, but although the ultrasonic detection can rapidly locate the damaged part, the specific damage condition cannot be accurately determined, so that the detection accuracy is too low. Disclosure of Invention In view of the foregoing, it is desirable to provide a method, an apparatus, a computer device, a computer-readable storage medium, and a computer program product for detecting a dry casing, which can improve detection accuracy. In a first aspect, the present application provides a method of detecting a dry cannula. The method comprises the steps of conducting ultrasonic scanning test on a plurality of dry casing samples to be detected to determine a first scanning result, wherein the first scanning result is used for indicating whether each sample in the dry casing samples to be detected is damaged or not, determining a target sample and a damage area of the target sample according to the first scanning result, wherein the target sample is the sample with damage in the dry casing samples to be detected, conducting X-ray scanning test on a fault of the damage area to obtain a second scanning result, and the second scanning result is used for indicating damage condition of the target sample. In one embodiment, the method further comprises the steps of carrying out grading load-holding tests on the target sample, carrying out acoustic emission tests on the target sample in each grading load-holding test stage to obtain a first test result, and determining the damage level of the target sample according to the second scanning result and the first test result. In one embodiment, the first test result is represented by a curve of the trend of accumulated energy over time, the slope of the curve being positively correlated with the injury level. In one embodiment, the second scanning result is a two-dimensional gray level image, and when the damage level of the target sample is determined according to the second scanning result and the first test result, the method can comprise the steps of carrying out three-dimensional reconstruction processing on the second scanning result to obtain a three-dimensional image of the second scanning result, determining the damage level according to the crack condition and the first test result which are displayed in the three-dimensional image of the second scanning result, and positively correlating the crack condition with the damage level. In one embodiment, the curve of the trend of the accumulated energy over time is obtained by linearly fitting the accumulated energy and time using a piecewise low order interpolation polynomial. In one embodiment, when the second scanning result is subjected to three-dimensional reconstruction processing to obtain a three-dimensional image of the second scanning result, the three-dimensional reconstruction processing can be performed by performing preprocessing on the two-dimensional gray image to obtain a processed two-dimensional gray image, and performing three-dimensional reconstruction processing on the processed two-dimensional gray image to obtain a three-dimensional image. In one embodiment, the load gradient of the graded load retention test is based on a maximum breaking load obtained by tensile testing any one of a plurality of non-target samples of the dry casing samples to be tested. In a second aspect, the application also provides a dry casing inspection device comprising a module capable of implementing the method of the first aspect and any one of its implementation forms. In one embodiment, the a