阅读说明：本技术 远场涡流检测微损伤的方法、装置、设备和存储介质 (Method, device, equipment and storage medium for detecting micro-damage by far-field eddy current ) 是由 李小丽 陈新波 王莉 黄富明 时建云 单柏荣 于 2020-04-21 设计创作，主要内容包括：本发明涉及一种远场涡流检测微损伤的方法、装置、设备和存储介质,该方法包括：根据检测灵敏度和渗透深度确定目标检测频率；提取实验数据,其中,实验数据包括腐蚀尺寸、腐蚀深度、裂纹深度和裂纹长度；根据实验数据制作标准检测试块,其中,标准检测试块包括多层结构内层裂纹缺陷检测试块、多层结构内层腐蚀缺陷检测试块和多层结构铆钉孔疲劳裂纹检测试块；应用远场涡流检测技术,根据目标检测频率对相应的各个标准检测试块进行微损伤检测,以确定各个标准检测试块的损伤类型和损伤位置；其中,损伤类型包括多层结构内层裂纹缺陷、多层结构内层腐蚀缺陷、多层结构铆钉孔疲劳裂纹。能检测到不同的损伤类型和损伤精度,提高了检测精度和灵敏度。(The invention relates to a method, a device, equipment and a storage medium for detecting micro-damage by far-field eddy current, wherein the method comprises the following steps: determining target detection frequency according to the detection sensitivity and the penetration depth; extracting experimental data, wherein the experimental data comprises corrosion size, corrosion depth, crack depth and crack length; manufacturing a standard detection test block according to the experimental data, wherein the standard detection test block comprises a multilayer structure inner layer crack defect detection test block, a multilayer structure inner layer corrosion defect detection test block and a multilayer structure rivet hole fatigue crack detection test block; carrying out micro-damage detection on each corresponding standard detection test block according to the target detection frequency by applying a far-field eddy current detection technology so as to determine the damage type and the damage position of each standard detection test block; wherein the damage types comprise multilayer structure inner layer crack defects, multilayer structure inner layer corrosion defects and multilayer structure rivet hole fatigue cracks. Different damage types and damage accuracies can be detected, and the detection accuracy and sensitivity are improved.)

1. A method for detecting micro-damage by far-field eddy current, comprising:

determining target detection frequency according to the detection sensitivity and the penetration depth;

extracting experimental data, wherein the experimental data comprises corrosion size, corrosion depth, crack depth and crack length;

manufacturing a standard detection test block according to the experimental data, wherein the standard detection test block comprises a multilayer structure inner layer crack defect detection test block, a multilayer structure inner layer corrosion defect detection test block and a multilayer structure rivet hole fatigue crack detection test block;

performing micro-damage detection on each corresponding standard detection test block according to the target detection frequency by using a far-field eddy current detection technology to determine the damage type and the damage position of each standard detection test block;

wherein the damage types comprise multilayer structure inner layer crack defects, multilayer structure inner layer corrosion defects and multilayer structure rivet hole fatigue crack defects.

2. The method of claim 1, wherein the detection of the crack defects in the inner layer of the multi-layer structure is performed by performing surface crack detection and deep crack detection on a flat plate structure to determine the minimum accuracy and sensitivity for crack detection.

3. The method of claim 1, wherein the factors affecting corrosion defects in the inner layer of the multilayer structure include the effect of defect depth, the effect of aluminum sheet number, the effect of defect size, and the effect of damage location.

4. The method of claim 1, wherein in the detection of the multilayer structure rivet hole fatigue crack defect, a skin layer rivet hole fatigue crack detection sensitivity is determined, and a rivet hole crack detection sensitivity is determined for a multilayer skin structure interior.

5. The method of claim 1, wherein the detection of crack defects in the internal layers of the multilayer structure comprises surface crack detection and internal crack detection, wherein the factor affecting the surface crack detection comprises corrosion depth and the factor affecting the internal crack detection comprises crack depth;

correspondingly, if the burial depth is the same, the detection signal amplitude is positively correlated with the crack depth.

6. The method according to claim 1, wherein the detection of corrosion defects of the inner layer of the multilayer structure comprises corrosion defect depth experimental detection and multilayer skin structure experimental detection, and the influencing factors of the multilayer skin structure experimental detection comprise skin thickness and defect depth;

correspondingly, if the buried depth is the same, the detection signal amplitude and the depth of the corrosion defect form a linear relation.

7. The method according to claim 1, wherein in the detection of the fatigue crack defect of the rivet hole of the multilayer structure, the detection amplitude is positively correlated with the crack depth; the phase of the detection signal is related to the number of layers of the defect on the skin and the buried depth of the defect.

8. A far-field eddy current micro-damage detection device, comprising:

the detection frequency determination module is used for determining target detection frequency according to the detection sensitivity and the penetration depth;

the data extraction module is used for extracting experimental data, wherein the experimental data comprises corrosion size, corrosion depth, crack depth and crack length;

the system comprises a detection test block manufacturing module, a data processing module and a data processing module, wherein the detection test block manufacturing module is used for manufacturing a standard detection test block according to experimental data, and the standard detection test block comprises a multilayer structure inner layer crack defect detection test block, a multilayer structure inner layer corrosion defect detection test block and a multilayer structure rivet hole fatigue crack detection test block;

the micro-damage detection module is used for carrying out micro-damage detection on each corresponding standard detection test block according to the target detection frequency by applying a far-field eddy current detection technology so as to determine the damage type and the damage position of each standard detection test block;

wherein the damage types comprise multilayer structure inner layer crack defects, multilayer structure inner layer corrosion defects and multilayer structure rivet hole fatigue crack defects.

9. An apparatus, comprising:

a processor, and a memory coupled to the processor;

the memory is configured to store a computer program for performing at least the far-field eddy current testing micro-damage method of any of claims 1-7;

the processor is used to call and execute the computer program in the memory.

10. A storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, performs the steps of the far-field eddy current detection micro-damage method according to any one of claims 1 to 7.

Technical Field

The invention relates to the field of nondestructive testing, in particular to a method, a device, equipment and a storage medium for detecting micro-damage by far-field eddy current.

Background

The invisible micro-damage of the airplane mainly refers to the inner layer of a multilayer structure with no surface visible, particularly the skin. In the application of aircraft stealth damage, the parts of the multi-layer skin structure which are easy to damage, such as lap joints, riveting and the like, bolt holes, rivet holes and other positions of the parts are easy to damage such as fatigue micro-cracks, corrosion and the like due to stress concentration.

Particularly, due to the fact that the hidden property of the damage occurring part is high, the damage occurring part is difficult to find, a large hidden risk exists, sudden major safety accidents can be caused often, and the life of personnel and equipment safety are seriously damaged.

Therefore, a suitable nondestructive testing method for researching the invisible micro-damage of the multi-layer skin structure is needed, damage is timely found and correctly evaluated, and then corresponding repairing measures are implemented, so that fatigue fracture is avoided, and flight safety is ensured.

Disclosure of Invention

In view of the above, a method, an apparatus, a device and a storage medium for detecting micro-damage by far-field eddy current are provided to solve the problem in the prior art that appropriate nondestructive detection and correct evaluation cannot be performed in the invisible micro-damage of the multi-layer skin structure.

The invention adopts the following technical scheme:

in a first aspect, an embodiment of the present application provides a method for detecting micro-damage by far-field eddy current, including:

determining target detection frequency according to the detection sensitivity and the penetration depth;

extracting experimental data, wherein the experimental data comprises corrosion size, corrosion depth, crack depth and crack length;

manufacturing a standard detection test block according to the experimental data, wherein the standard detection test block comprises a multilayer structure inner layer crack defect detection test block, a multilayer structure inner layer corrosion defect detection test block and a multilayer structure rivet hole fatigue crack detection test block;

carrying out micro-damage detection on each corresponding standard detection test block according to the target detection frequency by applying a far-field eddy current detection technology so as to determine the damage type and the damage position of each standard detection test block;

wherein the damage types comprise multilayer structure inner layer crack defects, multilayer structure inner layer corrosion defects and multilayer structure rivet hole fatigue cracks.

In a second aspect, the present application provides an apparatus for detecting micro-damage by far-field eddy current, the apparatus including:

the detection frequency determination module is used for determining target detection frequency according to the detection sensitivity and the penetration depth;

the data extraction module is used for extracting experimental data, wherein the experimental data comprises corrosion size, corrosion depth, crack depth and crack length;

the detection test block manufacturing module is used for manufacturing a standard detection test block according to the experimental data, wherein the standard detection test block comprises a multilayer structure inner layer crack defect detection test block, a multilayer structure inner layer corrosion defect detection test block and a multilayer structure rivet hole fatigue crack detection test block;

the micro-damage detection module is used for carrying out micro-damage detection on each corresponding standard detection test block according to the target detection frequency by applying a far-field eddy current detection technology so as to determine the damage type and the damage position of each standard detection test block;

wherein the damage types comprise multilayer structure inner layer crack defects, multilayer structure inner layer corrosion defects and multilayer structure rivet hole fatigue cracks.

In a third aspect, an embodiment of the present application provides an apparatus, including:

a processor, and a memory coupled to the processor;

the memory is used for storing a computer program, the computer program is at least used for executing the method for detecting the micro-damage by the far-field eddy current in the first aspect of the embodiment of the application;

the processor is used to call and execute the computer program in the memory.

In a fourth aspect, embodiments of the present application provide a storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps in the method for detecting micro-damage by far-field eddy current according to the first aspect are implemented.

By adopting the technical scheme, the detection sensitivity of the far-field vortex is high, the detection effect is obvious, the detection effect is good for the airplane skin which is difficult to detect, particularly for the multi-layer skin structure, and the in-situ detection of the multi-layer structure of the airplane skin can be completed. The inner layer crack detection performance, the inner layer corrosion detection performance and the rivet hole crack detection performance are achieved, and the detection accuracy and sensitivity are high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a flow chart of a method for detecting micro-damage by far-field eddy current provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an apparatus for detecting micro-damage by far-field eddy current according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an apparatus provided in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.