CN110031306B - Method, device and system for detecting strain cracks of coating material and storage medium - Google Patents
Method, device and system for detecting strain cracks of coating material and storage medium Download PDFInfo
- Publication number
- CN110031306B CN110031306B CN201910368712.1A CN201910368712A CN110031306B CN 110031306 B CN110031306 B CN 110031306B CN 201910368712 A CN201910368712 A CN 201910368712A CN 110031306 B CN110031306 B CN 110031306B
- Authority
- CN
- China
- Prior art keywords
- strain
- coating material
- change
- crack
- cracks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000011248 coating agent Substances 0.000 title claims abstract description 229
- 238000000576 coating method Methods 0.000 title claims abstract description 229
- 239000000463 material Substances 0.000 title claims abstract description 225
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000003860 storage Methods 0.000 title claims description 7
- 230000008859 change Effects 0.000 claims abstract description 114
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000007906 compression Methods 0.000 claims abstract description 5
- 230000000977 initiatory effect Effects 0.000 claims description 48
- 238000005336 cracking Methods 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000004590 computer program Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 13
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 230000004075 alteration Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000012720 thermal barrier coating Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0064—Initiation of crack
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method, a device, a system and a medium for detecting strain cracks of a coating material, wherein the method for detecting the strain cracks of the coating material comprises the following steps: acquiring strain detection data of the coating material during stretching or compression; generating a strain change curve according to the strain detection data; analyzing the strain change of the coating material according to the strain change curve; and judging the state of the strain crack of the coating material according to the strain change. The method, the device and the system for detecting the strain cracks of the coating material can judge the state of the strain cracks and provide data support for analyzing the damage mechanism of the coating material.
Description
Technical Field
The invention relates to the technical field of aerospace, in particular to a method for detecting strain cracks of a coating material, a device for detecting the strain cracks of the coating material, a computer-readable storage medium and a system for detecting the strain cracks of the coating material.
Background
For the detection of the mechanical properties of the coating material and the research of the damage mechanism, a universal tensile testing machine is mostly used for stretching or compressing the coating material under the macroscopic scale, and a high-resolution camera shooting method is usually adopted to observe the stretching or compression cracking process of the coating and measure the strain change condition of the surface of the coating by combining a digital image correlation method.
The detection of the strain cracks of the coating material is one aspect of mechanical property detection and damage mechanism exploration, but no simple and effective method for detecting the strain cracks of the coating material exists in the related art, and needs to be further improved.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the first purpose of the invention is to provide a method for detecting the strain cracks of the coating material, which can detect the change of the strain cracks of the coating, is simple and effective, and provides data support for analyzing the damage mechanism of the coating material.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the invention is to propose a device for detecting strain cracks in a coating material.
A fourth object of the invention is to propose a system for detecting strain cracks in a coating material.
In order to solve the above problem, a method for detecting strain cracks of a coating material according to an embodiment of the first aspect of the present invention includes: acquiring strain detection data of the coating material during stretching or compression; generating a strain change curve according to the strain detection data; analyzing the strain change of the coating material according to the strain change curve; and judging the state of the strain crack of the coating material according to the strain change.
According to the method for detecting the strain cracks of the coating material, provided by the embodiment of the invention, a novel method for detecting the strain cracks is provided, the strain change of the coating material is analyzed according to a strain change curve, and the state of the strain cracks of the coating material is judged according to the strain change, so that the method is simple and effective, and provides data support for analyzing the damage mechanism of the coating material.
In some embodiments, determining an initiation point of a strain crack of the coating material from the strain change; and determining a strain crack safety zone and a strain crack generation zone of the coating material according to the initiation initial point.
In some embodiments, determining an initiation point of strain crack initiation of the coating material from the strain change comprises: when the strain change of the coating material reaches a first strain threshold value, the strain continues to increase and is in periodic lifting change, and when the strain descending amplitude is smaller than a second strain threshold value, the strain of the coating material reaches the initiation initial point.
In some embodiments, determining a strain crack safe zone and a strain crack initiation zone of the coating material from the initiation point comprises: when the change in strain of the coating material is before the initiation point, the coating material is in the strain crack safe zone; when the change in strain of the coating material is after the initiation point, the coating material is in the strain crack initiation region.
In some embodiments, the method further comprises: and judging whether the coating material generates crack points and cracks in the strain crack generation area according to the strain change.
In some embodiments, determining whether the coating material has cracks or not according to the strain change in the strain crack generation region includes:
in the strain crack generation area, the strain linearly rises and the strain change rate is greater than the change rate threshold value, and when the strain change relative to the initiation initial point is greater than a third strain threshold value and the strain sudden drop and reduction amplitude are greater than a fourth strain threshold value, the strain of the coating material reaches a crack generation point;
when the strain change of the coating material is between the initiation point and the crack initiation point, the coating material generates a crack point;
the coating material creates the crack when the change in strain of the coating material is after the crack initiation point.
A computer-readable storage medium according to an embodiment of the second aspect of the invention has stored thereon a computer program which, when being executed by a processor, carries out the method for detecting strain cracks in a coating material according to the above embodiment.
In order to solve the above problems, an apparatus for detecting strain cracks of a coating material according to an embodiment of a third aspect of the present invention includes: the acquisition module is configured to acquire strain detection data of the coating material when the coating material is stretched or compressed; a generating module configured to generate a strain change curve according to the strain detection data; an analysis module configured to analyze a change in strain of the coating material according to the strain change profile; and the judging module is configured to judge the state of the strain crack of the coating material according to the strain change.
According to the device for detecting the strain cracks of the coating material, disclosed by the embodiment of the invention, the analysis module is used for analyzing the strain change of the coating material according to the strain change curve, and then the judgment module can be used for judging the state of the strain cracks of the coating material according to the strain change, so that the device is simple and effective, and provides data support for analyzing the damage mechanism of the coating material.
In order to solve the above problem, a system for detecting strain cracks of a coating material according to a fourth aspect of the present invention includes: a stretcher for stretching or compressing the coating material; the scanning electron microscope is used for acquiring a scanning image of the coating material when the coating material is stretched or compressed; processing means for obtaining strain detection data of the coating material when stretched or compressed from the scanned image; the apparatus for detecting strain cracks in a coating material as described in the above examples.
According to the system for detecting the strain cracks of the coating material, disclosed by the embodiment of the invention, by adopting the device for detecting the strain cracks of the coating material, the strain crack state of the coating material can be simply and effectively judged, and data support is provided for analyzing the damage mechanism of the coating material.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method of detecting strain cracks in a coating material according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a strain curve according to an embodiment of the present invention;
FIG. 3 is a block diagram of an apparatus for detecting strain cracks in a coating material according to one embodiment of the present invention;
FIG. 4 is a block diagram of a system for detecting strain cracks in a coating material according to one embodiment of the invention.
Reference numerals:
a system 1000 for detecting strain cracks in a coating material;
the device 100 for detecting the strain cracks of the coating material, the stretcher 200, the scanning electron microscope 300 and the processing device 400;
the device comprises an acquisition module 10, a generation module 20, an analysis module 30 and a judgment module 40.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
The method, the device and the system for detecting the strain cracks of the coating material can be applied to the technical field of aerospace, for example, for a thermal barrier coating on an engine blade in aerospace equipment, the method, the device and the system can be used for detecting the strain cracks, so that data support is provided for analyzing and deducing a damage mechanism of the coating material, and the performance of an engine of the aerospace equipment is improved.
A method of detecting strain cracks in a coating material according to an embodiment of the first aspect of the invention is described below with reference to fig. 1 and 2.
Fig. 1 is a flowchart of a method of detecting strain cracks of a coating material according to an embodiment of the present invention, and as shown in fig. 1, the method of detecting strain cracks of a coating material according to an embodiment of the present invention includes step S1, step S2, step S3, and step S4.
And step S1, acquiring strain detection data when the coating material is stretched or compressed.
Specifically, the coating material is stretched or compressed by a stretching machine, and an image of the coating material during stretching or compressing is acquired, for example, the cracking process of the coating material is observed by a high-resolution camera shooting method, or the cracking process of the coating material is observed by an electron scanning microscope, and the strain change condition of the coating material is measured by combining a digital image correlation method, so as to acquire the strain detection data of the coating material during stretching or compressing.
In an embodiment, the stretching machine and the coating material may be placed in a sample chamber of a scanning electron microscope, and scanned in situ at a micro-nano level by the scanning electron microscope to obtain a scanning image during stretching or compressing of the coating material, the scanning image is processed by a digital image correlation method, and strain change of the coating material is measured according to the processed scanning image to obtain strain detection data.
In step S2, a strain change curve is generated from the strain detection data.
Specifically, the strain detection data of each point on the surface of the coating material is obtained, and then the strain change curves of each point can be generated by the strain detection data of each point on the surface of the coating material through VIC2D software.
And step S3, analyzing the strain change of the coating material according to the strain change curve.
Specifically, during the stretching process, the strain of the coating material is divided into several change stages from initial stretching to falling off from the substrate, the dividing points at different change stages correspond to inflection points on a strain change curve, and the change rules of the strain at different change stages are different and can be presented through the strain change curve, so that the strain change of the coating material at different stages can be analyzed by referring to the strain change curve.
Step S4, the state of the strain crack of the coating material is judged according to the strain change.
Specifically, as the tensile or compressive load is continuously applied to the coating material, the coating material will crack from no crack generation to a crack generation point, crack generation and crack generation until the coating material is separated from the substrate, and the strain change of the coating material is different at each stage in the process, so that the strain crack state of the coating material can be judged according to the strain change of the coating material, for example, whether the coating material cracks or does not crack or whether the coating material cracks or already cracks can be judged according to the strain change of the coating material.
According to the method for detecting the strain cracks of the coating material, disclosed by the embodiment of the invention, the strain change of the coating material is analyzed through the strain change curve, and the state of the strain cracks of the coating material is judged according to the strain change, so that a novel method for detecting the strain cracks is provided, is simple and effective, and provides data support for analyzing the damage mechanism of the coating material.
In some embodiments, an initiation point of a strain crack of the coating material is determined from the strain change, which may be understood as the point after which the strain change will initiate a crack in the coating material; further, determining a strain crack safe area and a strain crack generating area of the coating material according to the initiation point, wherein the strain crack safe area can be an uncracked area of the coating material, namely, no crack point or crack is generated in the coating material; in contrast, the strain crack initiation zone is the cracking zone of the coating material, i.e. initiation and crack initiation within the coating material.
Further, when the strain change of the coating material reaches a first strain threshold value, the strain continues to increase and is in periodic ascending and descending changes, and when the strain descending amplitude is smaller than a second strain threshold value, the strain of the coating material reaches an initiation point. In an embodiment, when the change in strain of the coating material is before this initiation point, the coating material is in a strain crack safe zone, i.e. no cracks are created within the coating material; when the strain change of the coating material is behind the initiation point, the coating material is in a strain crack generation area, i.e., cracks are initiated and generated in the coating material.
And in the strain crack generation area, judging whether the coating material generates cracks or not according to the strain change. Specifically, in the strain crack generation area, the strain of the coating material rises linearly and the strain change rate is greater than the change rate threshold value, and when the strain change relative to the initiation initial point is greater than the third strain threshold value and the strain suddenly drops and the reduction amplitude is greater than the fourth strain threshold value, the strain of the coating material reaches the crack generation point; when the strain change of the coating material is between the initiation point and the crack generation point, the coating material generates a crack point; the coating material cracks when the strain change of the coating material is after the crack initiation point.
Specifically, the strain in the coating material slowly and smoothly rises during a long period of time when the coating material is initially subjected to a load, until it rises in a wave-like manner, which corresponds to a stage before an initiation initial point at which no crack is generated in the coating material, and a crack-free point, which is a strain crack safety zone of the coating material. When the tensile or compressive load reaches a certain stage, the strain of a small part of the area of the coating material is increased sharply, corresponding to the stage between the initiation point of the initiation and the crack generation point, the crack point of the coating material is generated at the stage, the coating material shows a rapid crack initiation stage at the stage, and after the crack generation point is reached, the crack appears on the surface of the coating material. In short, the stress change is the strain crack safe zone of the coating material before the initiation point, and the stress change is the stage of crack initiation after the initiation point.
By way of example, FIG. 2 is a schematic representation of a strain curve of a coating material according to one embodiment of the present invention. As shown in fig. 2, the change in strain of the coating material from the point O where stretching starts to the first inflection point a is small, not more than 0.005. When the strain reaches 0.005, namely the first inflection point A, the strain of the coating material enters a second stage; in the second stage, the strain fluctuates periodically, and each period comprises two processes of rising and lowering. Gradually reducing the variation value of the periodic fluctuation along with the increase of the stretching time, reaching a second inflection point B when the reduction value of the periodic fluctuation is less than 0.001, and entering a third stage, wherein the second inflection point B corresponds to the initial initiation point of the coating material; in the third stage, the strain of the coating material is accelerated at all positions, and the strain is concentrated at a certain point on the surface of the coating material along with the increase of time, and when the strain of the point relative to the point B changes by more than 7.5 multiplied by 10 per second-5These positions are the cracking positions of the coating. Until the coating strain is rapidly reduced, the reduction amplitude is not less than 0.003, namely the stress is released, the cracking point, namely a third inflection point C is reached, the third inflection point C corresponds to the crack generation point of the coating material, and the crack appears after the third inflection point C.
In short, no crack is generated in the coating material before the stress change corresponds to the second inflection point B, and a crack is generated and generated in the coating material after the stress change corresponds to the second inflection point B, wherein the strain change is between the second inflection point B and the third inflection point C, the coating material generates a crack point at the rapid crack initiation stage, and the strain change generates a crack in the coating material after the third inflection point C.
In summary, the method for detecting the strain cracks of the coating material, provided by the embodiment of the invention, analyzes the strain change through the strain change curve, judges the state of the strain cracks of the coating material based on the strain change, is simple and effective, and provides data support for analyzing the damage mechanism of the coating material.
Based on the method for detecting a strain crack of a coating material of the above embodiment, a computer-readable storage medium is provided as an embodiment of the second aspect of the invention, on which a computer program is stored, which, when being executed by a processor, implements the method for detecting a strain crack of a coating material of the above embodiment.
An apparatus for detecting strain cracks of a coating material according to an embodiment of the third aspect of the present invention will be described below with reference to the accompanying drawings.
Fig. 3 is a block diagram of an apparatus for detecting a strain crack of a coating material according to an embodiment of the present invention, and as shown in fig. 3, the apparatus 100 for detecting a strain crack of a coating material according to an embodiment of the present invention includes an acquisition module 10, a generation module 20, an analysis module 30, and a determination module 40.
Wherein the acquisition module 10 is configured to acquire strain detection data of the coating material when it is stretched or compressed. The generating module 20 is configured to generate a strain variation curve according to the strain detection data; the analysis module 30 is configured to analyze the change in strain of the coating material according to a strain change curve; the determination module 40 is configured to determine a state of the strain crack of the coating material according to the strain change.
Specifically, during the stretching process, the strain of the coating material is divided into several change stages from initial stretching to falling off from the substrate, the dividing points at different change stages correspond to inflection points on a strain change curve, and the change rules of the strain at different change stages are different and can be presented through the strain change curve, so that the strain change of the coating material at different stages can be analyzed by referring to the strain change curve. As the tensile or compressive load is continuously applied to the coating material, the coating material can be subjected to no crack generation, crack initiation and crack generation until the coating material is separated from the substrate, and the strain change of the coating material is different in the process, so that the strain crack state of the coating material can be judged according to the strain change of the coating material, for example, whether the coating material is cracked or not, whether the coating material is cracked or has been cracked can be judged according to the strain change of the coating material.
According to the device 100 for detecting the strain cracks of the coating material, disclosed by the embodiment of the invention, the analysis module 30 is used for analyzing the strain change of the coating material according to the strain change curve, and then the judgment module 40 can be used for judging the state of the strain cracks of the coating material according to the strain change, so that the device is simple and effective, and provides data support for analyzing the damage mechanism of the coating material.
A system for detecting strain cracks of a coating material according to a fourth aspect of the present invention will be described with reference to the accompanying drawings. Fig. 4 is a block diagram of a system for detecting strain cracks of a coating material according to an embodiment of the present invention, and as shown in fig. 4, a system 1000 for detecting strain cracks of a coating material according to an embodiment of the present invention includes an apparatus 100 for detecting strain cracks of a coating material, a stretcher 200, a scanning electron microscope 300, and a processing apparatus 400 as in the above embodiments.
Wherein the stretcher 200 is used for stretching or compressing the coating material; the coating material and stretcher 200 is placed in a sample chamber of a scanning electron microscope 300, and the scanning electron microscope 300 is used for collecting scanning images of the coating material during stretching or compression; the processing device 400 is used for obtaining the strain detection data of the coating material when the coating material is stretched or compressed according to the scanning image; the device 100 for detecting the strain cracks of the coating material is used for generating a strain change curve according to strain detection data, analyzing strain change according to the strain change curve, further judging the state of the strain cracks of the coating material according to the strain change, and providing data support for analyzing a damage mechanism of the coating material.
According to the system 1000 for detecting the strain cracks of the coating material, provided by the embodiment of the invention, by adopting the device 100 for detecting the strain cracks of the coating material, the strain crack state of the coating material can be simply and effectively judged, and data support is provided for analyzing the damage mechanism of the coating material.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. A method of detecting strain cracks in a coating material, the method comprising:
acquiring strain detection data of the coating material during stretching or compression;
generating a strain change curve according to the strain detection data;
analyzing the strain change of the coating material according to the strain change curve;
determining an initiation initial point of a strain crack of the coating material according to the strain change, wherein after the strain change of the coating material reaches a first strain threshold value, the strain continues to increase and is in periodic ascending and descending changes, and when the strain descending amplitude is smaller than a second strain threshold value, the strain of the coating material reaches the initiation initial point;
and determining a strain crack safety zone and a strain crack generation zone of the coating material according to the initiation initial point.
2. The method of detecting strain cracks in a coating material of claim 1, wherein determining a strain crack safe zone and a strain crack initiation zone of the coating material based on the initiation point comprises:
when the change in strain of the coating material is before the initiation point, the coating material is in the strain crack safe zone;
when the change in strain of the coating material is after the initiation point, the coating material is in the strain crack initiation region.
3. The method of detecting strain cracks in a coating material of claim 2, further comprising:
and judging whether the coating material generates crack points and cracks in the strain crack generation area according to the strain change.
4. The method for detecting the strain cracks of the coating material according to claim 3, wherein the judging whether the coating material generates the cracking points and cracks according to the strain changes in the strain crack generation area comprises:
in the strain crack generation area, the strain linearly rises and the strain change rate is greater than the change rate threshold value, and when the strain change relative to the initiation initial point is greater than a third strain threshold value and the strain sudden drop and reduction amplitude are greater than a fourth strain threshold value, the strain of the coating material reaches a crack generation point;
when the strain change of the coating material is between the initiation point and the crack initiation point, the coating material generates a crack point;
the coating material creates the crack when the change in strain of the coating material is after the crack initiation point.
5. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of detecting strain cracks in a coating material according to any one of claims 1 to 4.
6. An apparatus for detecting strain cracks in a coating material, the apparatus comprising:
the acquisition module is configured to acquire strain detection data of the coating material when the coating material is stretched or compressed;
a generating module configured to generate a strain change curve according to the strain detection data;
an analysis module configured to analyze a change in strain of the coating material according to the strain change profile;
and the judging module is configured to judge the state of the strain crack of the coating material according to the strain change, wherein after the strain change of the coating material reaches a first strain threshold value, the strain continues to increase and is in periodic ascending and descending changes, and when the strain descending amplitude is smaller than a second strain threshold value, the strain of the coating material reaches an initiation initial point.
7. A system for detecting strain cracks in a coating material, the system comprising:
a stretcher for stretching or compressing the coating material;
the scanning electron microscope is used for acquiring a scanning image of the coating material when the coating material is stretched or compressed;
processing means for obtaining strain detection data of the coating material when stretched or compressed from the scanned image;
apparatus for detecting strain cracks in coating materials according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910368712.1A CN110031306B (en) | 2019-05-05 | 2019-05-05 | Method, device and system for detecting strain cracks of coating material and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910368712.1A CN110031306B (en) | 2019-05-05 | 2019-05-05 | Method, device and system for detecting strain cracks of coating material and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110031306A CN110031306A (en) | 2019-07-19 |
| CN110031306B true CN110031306B (en) | 2020-01-24 |
Family
ID=67241320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910368712.1A Active CN110031306B (en) | 2019-05-05 | 2019-05-05 | Method, device and system for detecting strain cracks of coating material and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110031306B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113916937A (en) * | 2021-08-24 | 2022-01-11 | 中国人民解放军陆军装甲兵学院 | Crack detection method, crack detection device, electronic equipment and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100405040C (en) * | 2005-08-15 | 2008-07-23 | 清华大学 | Film stretching loading device under scanning microscopy environment and film distortion measurement method |
| CN101592573B (en) * | 2009-06-08 | 2011-02-16 | 清华大学 | Tension-compression and fatigue loading testing machine based on laser confocal microscope |
| CN103471905B (en) * | 2013-09-16 | 2016-05-11 | 清华大学 | For single-axis bidirectional micro mechanics measurement mechanism and the measuring method of scanning microscopy environment |
| CN104677738B (en) * | 2015-02-09 | 2017-09-29 | 清华大学 | A kind of bubbling method for being used to measure thin film mechanics characteristic |
| CN109682681A (en) * | 2018-12-06 | 2019-04-26 | 内蒙合成化工研究所 | A kind of test method of coating micro-crack dynamic expansion and selfreparing effect |
-
2019
- 2019-05-05 CN CN201910368712.1A patent/CN110031306B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110031306A (en) | 2019-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101598650B (en) | Method for determining load-life curve and working life of component | |
| KR101720845B1 (en) | Method of obtaining reliable true stress-strain curves in a large range of strains in tensile testing using digital image correlation | |
| US9128018B2 (en) | Method for evaluating corrosion-fatigue life of steel material | |
| JP2011149873A (en) | Fatigue characteristic determination method and fatigue life prediction method of material | |
| JPWO2011099270A1 (en) | Fracture surface analysis system and fracture surface analysis method | |
| CN110031306B (en) | Method, device and system for detecting strain cracks of coating material and storage medium | |
| JP2020003234A (en) | Displacement measuring device, displacement measuring method, and displacement measuring program | |
| CN114332089A (en) | Method, device and system for controlling production quality of plastic sheath based on image processing | |
| CN103592114A (en) | Method for detecting mechanical property of self-piercing riveting joint | |
| CN114065556A (en) | Amplitude-variable fatigue life prediction method based on dissipation energy | |
| JP2012163420A (en) | Fatigue limit identifying system and fatigue limit identifying method | |
| Rigon et al. | Analysis of dissipated energy and temperature fields at severe notches of AISI 304L stainless steel specimens | |
| JP2012073182A (en) | Method for testing material | |
| Panin et al. | Fatigue damage evaluation of carbon fiber composite using aluminum foil based strain sensors | |
| CN110082207B (en) | Method, device, system and storage medium for detecting strain failure of coating material | |
| JP4661540B2 (en) | Press monitoring system and AE evaluation method | |
| JP2015215199A (en) | Self-luminous material image processing apparatus and self-luminous material image processing method | |
| CN112162011A (en) | Composite insulator defect detection method, device and storage medium | |
| JP2006194869A (en) | Automatic testing equipment and debris inspection method | |
| CN112924307A (en) | Fatigue limit rapid prediction method based on infrared thermal imaging | |
| JP5583489B2 (en) | Method and apparatus for evaluating damage of metal materials | |
| Burkov et al. | Investigation of sensitivity of aluminum foil based strain sensors at fatigue damage evaluation of CFRP | |
| Tretyakov et al. | Experimental study of the crack growth processes in composite samples | |
| Burkov et al. | An approach for structural health monitoring of CFRP using aluminum foil sen sors | |
| Panin et al. | Investigation of various criteria for evaluation of aluminum thin foil ‘‘smart sensors’’images |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |