CN113177272B - Method for numerical simulation and parameter analysis of fatigue finite element after corrosion of metal material - Google Patents
Method for numerical simulation and parameter analysis of fatigue finite element after corrosion of metal material Download PDFInfo
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Abstract
The invention provides a method for numerical simulation and parameter analysis of fatigue finite elements of a corroded metal material, which comprises the following steps of: scanning an existing corroded metal material test piece to obtain a corroded three-dimensional digital model, and establishing a three-dimensional coordinate database of corroded morphology; establishing a random probability model, randomly selecting three-dimensional coordinate points, recombining point clouds, fitting a new corrosion surface, and establishing a new corrosion model; extracting two corrosion surfaces of the obtained new corrosion model, carrying out mesh division and hexahedral mesh model establishment by using Hypermesh software, and then carrying out fatigue calculation on the corrosion model by combining ABAQUS software and Fe-safe software. By adopting the technical scheme of the invention, the problems of long time consumption and large discreteness of test results of corrosion and fatigue tests are effectively solved, time is effectively saved by a finite element fatigue calculation method, and compared with the test results, the fatigue simulation result is accurate and effective.
Description
Technical Field
The invention belongs to the technical field of material corrosion, and particularly relates to a method for numerical simulation and parameter analysis of fatigue finite elements of a metal material after corrosion.
Background
As the marine environment has the characteristics of high salt content, high temperature, high humidity and the like, the metal material usually has corrosion in the marine environment or offshore environment, so that the bearing capacity and the fatigue strength of the metal material are reduced, and the metal structure is cracked and damaged under the action of repeated tensile, compression, bending, torsion and other fatigue loads such as wind load, sea wave impact and the like, so that the research on the fatigue performance of the metal material after corrosion has important significance and engineering value.
Because the corrosion and fatigue test takes long time, the test result has large discreteness, and is easily influenced by test conditions, most students analyze the fatigue performance of the metal material after corrosion by applying a finite element numerical simulation method, research the influence factors of the fatigue performance, and discover that the corrosion amount of the metal material in a corrosion environment and the surface topography of the metal material after corrosion have great influence on the fatigue performance. However, because the corrosion test time and the site conditions are limited, a large amount of corrosion data of the metal material cannot be obtained, and the corrosion amount and the corrosion morphology of the corrosion test piece cannot be quantitatively analyzed to study the influence of the corrosion test piece on the fatigue performance of the metal material after corrosion. Therefore, it is very important how to use limited corrosion data of metal materials to perform parameter analysis to obtain more corrosion finite element models with different sensitivity parameters and study the fatigue performance of the corrosion finite element models.
Disclosure of Invention
Aiming at the technical problems, the invention discloses a method for numerical simulation and parameter analysis of fatigue finite elements of a metal material after corrosion,
in contrast, the technical scheme adopted by the invention is as follows:
a method for simulating and analyzing the fatigue finite element numerical value and the parameters of a metal material after corrosion comprises the following steps:
step S1, scanning the existing corroded metal material test piece to obtain a corroded three-dimensional digital model, and establishing a three-dimensional coordinate database of corroded morphology;
step S2, establishing a random probability model, randomly selecting three-dimensional coordinate points, recombining point clouds, fitting a new corrosion surface, and establishing a new corrosion model;
and step S3, extracting two corrosion surfaces of the obtained new corrosion model, carrying out grid division and hexahedron grid model establishment by using Hypermesh software, and then carrying out fatigue calculation on the corrosion model by combining ABAQUS software and Fe-safe software.
As a further improvement of the present invention, step S1 includes: and 3D scanning the corroded metal material test piece by using a 3D scanner to obtain a polygonal grid model of the test piece, further converting to obtain a three-dimensional solid model, and then performing grid division and fatigue simulation on the three-dimensional solid model by using a finite element analysis method.
As a further improvement of the invention, tetrahedral mesh is adopted for mesh division.
As a further improvement of the invention, Hypermesh software is adopted for grid division. Further, the grid division by using Hypermesh software comprises the following steps:
opening a polygonal mesh model in reverse engineering software Geomagic Wrap, then repairing an initial scanning model by using a repairing function in the software, so that the model is formed by closed and continuous polygonal meshes, extracting upper and lower corrosion surfaces of a corrosion model, and then importing a stl format file with two corrosion planes into Hypermesh software, wherein the corrosion surfaces at the moment are formed by triangular meshes;
establishing two planes consisting of regular quadrilateral grids in the normal direction of the corrosion surface to cover but not exceed the original corrosion surface;
using a map to get function of a HyperMorph tool in Hypermesh software, wherein map to elements selects a regular quadrilateral mesh plane, map nodes selects an erosion surface formed by triangular meshes, a normal direction is selected in a mapping direction, the regular quadrilateral meshes are mapped onto the erosion surface, and finally two erosion surfaces formed by the regular quadrilateral meshes are obtained;
connecting two quadrilateral mesh corrosion surfaces together by using a 'linear solid' function of a 3D tool in Hypermesh software to obtain a regular hexahedron mesh model, then introducing the obtained hexahedron mesh corrosion model into ABAQUS software, and defining mesh unit types, material properties and boundary conditions so as to establish a complete finite element fatigue calculation corrosion model of the metal material corrosion test piece.
As a further improvement of the invention, the fatigue calculation of the corrosion model by combining ABAQUS software and Fe-safe software comprises the steps of adopting a stress-life method in Fe-safe and performing fatigue calculation according to Miner linear accumulation criterion and a rain flow counting method. Specifically, the method comprises the following steps:
importing the corrosion model into ABAQUS software, applying static load, and performing static analysis to obtain a stress cloud picture of the corrosion model;
importing the stress cloud picture of the corrosion model into Fe-safe software in an odb format file, namely storing the node stress of the corrosion model into the Fe-safe software for fatigue analysis;
performing fatigue calculation on the corrosion model by adopting a stress-life method according to a Miner linear accumulation criterion and a rain flow counting method;
in Fe-safe softwareFor feeding in materialS-NAnd setting the fatigue load and stress ratio of the model, and obtaining the fatigue life of the final model by adopting a nominal stress method in combination with the stress concentration coefficient.
As a further improvement of the present invention, step S1 includes:
cutting the upper and lower corrosion surfaces of the obtained corrosion model by using Geomagic Wrap software so as to obtain a plurality of corrosion surfaces with smaller areas (relative to the upper and lower corrosion surfaces of the corrosion model mentioned above), wherein each corrosion surface has different corrosion appearances; taking the small corrosion surfaces as initial samples, respectively taking out the initial samples, converting the initial samples into a point cloud model, exporting a file in an obj. format, and opening the file by using a notebook to obtain three-dimensional coordinates of the point cloud forming the corrosion morphology of the point cloud; and storing the point cloud three-dimensional coordinates of each small corrosion surface, and repeating the steps to obtain a three-dimensional coordinate database consisting of a large number of corrosion surfaces with different corrosion appearances.
As a further improvement of the method, under the condition of having a plurality of corrosion models, the corrosion amount and the corrosion morphology of the metal material are quantitatively analyzed, and the influence of two parameters of the corrosion amount and the corrosion morphology on the fatigue performance of the metal material is researched.
As a further improvement of the invention, the corrosion amount of the corrosion model is measured and evaluated by adopting the volume loss rate of the model, the volume of the corrosion model is calculated by utilizing a volume calculation tool carried by Geomagic Wrap software, and is compared with the volume before corrosion, so that the ratio of the volume reduction of the test piece after corrosion to the volume of the test piece before corrosion, namely the volume loss rate caused by corrosion is obtained.
As a further improvement of the invention, the corrosion morphology is expressed by two indexes, namely the average thickness and the minimum thickness of the corrosion model, and the average thickness and the minimum thickness of the corrosion model are obtained by utilizing Geomagic Wrap software and a mathematical analysis tool.
The larger the difference between the average thickness and the minimum thickness of the model is, the more serious the corrosion unevenness degree of the surface of the metal material is, the larger the roughness is, and finally, when external fatigue load is applied, the expansion of fatigue cracks is promoted due to a larger stress concentration effect, so that the fatigue performance of the metal material is reduced.
Finally, fatigue calculation is carried out on the corrosion model through ABAQUS software and Fe-safe software, so that the corrosion model with different volume loss rates and residual thicknesses can be obtainedS-NCurve line. On the basis of a finite element fatigue analysis result and the existing specification, theoretical analysis is carried out, an internal relation formula among the volume loss rate, the residual thickness, the fatigue stress and the fatigue life can be obtained, not only can suggestions and guidance be provided for the fatigue performance of the metal material in the practical engineering under the marine environment, but also the residual fatigue life of the metal material under a certain volume loss rate and residual thickness can be predicted.
Compared with the prior art, the invention has the beneficial effects that:
firstly, by adopting the technical scheme of the invention, the problems of long time consumption and large discreteness of test results of corrosion and fatigue tests can be effectively solved, the time can be effectively saved by using the finite element fatigue calculation method, and compared with the test results, the fatigue simulation result is accurate and effective.
Secondly, by adopting the technical scheme of the invention, the problems of long corrosion time and limited number of corrosion metal material test pieces can be solved, parameter analysis can be carried out on the basis of the original corrosion model by establishing a corrosion model database and a random probability model, a large number of corrosion models with different corrosion amounts and corrosion appearances are obtained, the influence of the volume loss rate and the residual thickness on the fatigue performance of the metal material is researched, a relevant stress-life formula is obtained, and the residual fatigue life of the actual engineering metal material is predicted.
Thirdly, the method for dividing the corrosion model mesh by using Hypermesh software, which is provided by the technical scheme of the invention, can establish an effective and convergent hexahedron mesh corrosion model, can avoid the problems of poor precision and low calculation efficiency of the tetrahedral mesh, and improve the calculation precision and the calculation efficiency of the model.
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FIG. 1 is a flow chart of an embodiment of the present invention.
FIG. 2 is a triangular grid diagram of a three-dimensional model of corrosion formed in accordance with an embodiment of the present invention.
FIG. 3 is a three-dimensional model diagram according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of upper and lower etching planes of the etching model according to the embodiment of the present invention.
FIG. 5 is a schematic plan view of two regular quadrilateral grids created in the direction normal to the corrosion surface in accordance with an embodiment of the present invention.
FIG. 6 shows two etched surfaces formed by regular quadrilateral grids in accordance with an embodiment of the present invention.
Fig. 7 is a diagram of a hexahedral mesh model according to an embodiment of the present invention, in which (a) is a model diagram of the entire hexahedral mesh, and (b) is a partially enlarged schematic view of (a).
Figure 8 is a schematic illustration of an etched surface of a 20-aliquot of an example of the present invention.
Detailed Description
Preferred embodiments of the present invention are described in further detail below.
A method for finite element numerical simulation and parametric analysis of fatigue after corrosion of a metallic material, as shown in fig. 1, comprising:
firstly, placing a prepared metal material test piece in a marine environment or a simulated marine environment for corrosion, and after a corrosion test is finished, removing corrosion products from the metal material test piece according to the requirements in the specification of removal of corrosion products on a corrosion test piece for metals and alloys (GB/T16545-2015). Because the appearance of the corroded metal material has a great influence on the fatigue performance of the metal material, in order to ensure the accuracy of finite element simulation, an accurate three-dimensional model of the corroded metal material needs to be established.
In order to accurately simulate the corroded appearance of the metal material, the reverse modeling thinking is adopted, namely, the data (generally point cloud) of the corroded metal material is scanned according to the existing solid part, and then the digital model of the corroded metal material is regenerated in a 3D environment. And 3D scanning the corroded metal material test piece by using a 3D scanner to obtain a three-dimensional model file (stl.) of the test piece. The 3D scanner scans the metal material test piece to obtain a three-dimensional space model, also called a point cloud data model, which is composed of n points at the beginning, the point cloud data model is encapsulated, every three points form a triangular mesh, and the three-dimensional model at this time is composed of n triangular meshes, as shown in fig. 2, that is, a polygonal mesh model. Due to the automatic packaging function of the 3D scanner, the point cloud can be directly converted into a triangular mesh, and therefore the stl format file obtained by scanning contains a polygonal mesh model of the metal material test piece.
The stl. format file obtained by 3D scanning is imported into the three-dimensional analysis software Geomagic Wrap, as shown in FIG. 3, it can be seen that the three-dimensional model is an irregular body due to corrosion. The 3D scanner scans the outer surface or the space appearance of the metal material test piece, and the obtained model is a polygonal mesh closed model and cannot be directly used for finite element analysis. The traditional method is to further convert the polygonal mesh model into a closed surface model, and then export the surface model into a three-dimensional entity model, so that the entity model can be imported into general finite element analysis software such as ABAQUS and the like for mesh division and fatigue simulation. However, since the corrosion surface of the metallic material test piece is complex and irregular, if the hexahedral mesh is used for division, the aspect ratio of the hexahedral mesh exceeds the internal limit of ABAQUS, and the analysis cannot be performed. Therefore, only the tetrahedral mesh can be used for division, but the computational accuracy of the tetrahedral mesh is poor and the computational cost is high compared with the hexahedral mesh. In order to improve the calculation accuracy and the calculation efficiency of the model, the mesh division can be performed by using Hypermesh software.
The regular lattice is covered on the surface of the three-dimensional scanning model by using the 'map to get' function of a HyperMorph tool in Hypermesh software, and then the regular hexahedron unit model which is suitable for fatigue calculation is constructed by using the mesh editing function. The specific operation is as follows:
(1) opening the polygonal mesh model in reverse engineering software Geomagic Wrap, and then repairing some holes and redundant nodes possibly existing in the initial scanning model by utilizing a repairing function in the software, so that the model is formed by closed and continuous polygonal meshes. As shown in fig. 4, two upper and lower corrosion surfaces of the corrosion model are selected, and the stl format file with two corrosion planes is imported into Hypermesh software, where the corrosion surfaces are composed of triangular meshes.
(2) As shown in fig. 5, in the normal direction of the etched surface, two planes consisting of regular quadrilateral grids are established so as to cover but not exceed the original etched surface. The 'map to get' function of a HyperMorph tool in Hypermesh software is used, wherein the map to elements selects a regular quadrilateral grid plane, the map nodes selects an erosion surface, the mapping direction selects a normal direction, the regular quadrilateral grid is mapped onto the erosion surface, and finally two erosion surfaces formed by the regular quadrilateral grid can be obtained, as shown in fig. 6.
(3) The two quadrilateral mesh corrosion surfaces are connected together by using the 'linear solid' function of a 3D tool in Hypermesh software to obtain a regular hexahedral mesh model, as shown in figure 7, and then the obtained hexahedral mesh corrosion model is introduced into ABAQUS software to define the mesh unit types, the material properties and the boundary conditions, so that a complete finite element fatigue calculation model of the metal material corrosion test piece is established.
Fatigue calculation is carried out on the corrosion model by combining ABAQUS and Fe-safe software, wherein Fe-safe is professional fatigue analysis software, and fatigue design simulation, namely fatigue life analysis, can be carried out on the basis of ABAQUS stress analysis. And (3) adopting a stress-life method in Fe-safe, and carrying out fatigue calculation according to Miner linear accumulation criterion and a rain flow counting method. The specific analysis steps are as follows:
(1) importing the corrosion model into ABAQUS software, applying static load, and performing static analysis to obtain a stress cloud picture of the corrosion model;
(2) importing the stress cloud graph of the corrosion model into Fe-safe software in an odb format file, namely storing the node stress of the corrosion model into the Fe-safe software for fatigue analysis;
(3) for inputting materials in Fe-safe softwareS-NCurve and set fatigue load of modelStress ratio, combining stress concentration coefficient, and adopting nominal stress method to obtain fatigue life of final model.
Further carrying out parameter analysis. As can be seen from the above, the corrosion amount and the corrosion morphology of the metal material test piece have great influence on the fatigue performance of the metal material test piece, but because the corrosion consumes a long time, a large amount of corrosion test pieces cannot be obtained, and the corrosion amount and the corrosion morphology cannot be quantified to study the influence on the fatigue performance of the metal material. Before that, many scholars usually adopt a method of artificially arranging corrosion pits in a finite element model to research the influence of the artificial corrosion pits on the mechanical property of the metal material, but certain disadvantages exist, the artificially arranged corrosion pits are greatly different from the real corrosion morphology, an accurate conclusion cannot be drawn, and the fatigue strength of the metal material after corrosion cannot be predicted.
Therefore, the applicant proposes an innovative parametric analysis method. Firstly, establishing a three-dimensional coordinate database of corrosion morphology by using corrosion model data obtained by existing 3D scanning; and then, establishing a random probability model by using a mathematical analysis tool, randomly selecting three-dimensional coordinate points, recombining to fit a new corrosion surface, and then establishing a new corrosion model. The method comprises the following specific steps:
(1) as shown in fig. 8, the upper and lower etched surfaces of the obtained etching model are cut by using Geomagic Wrap software, so as to obtain a plurality of etched surfaces with smaller areas (relative to the upper and lower etched surfaces of the aforementioned etching model), each having a different etching morphology; taking the small corrosion surfaces as initial samples, respectively taking out the initial samples, converting the initial samples into a point cloud model, exporting a file in an obj. format, and opening the file by using a notebook to obtain three-dimensional coordinates of the point cloud forming the corrosion morphology of the point cloud; and storing the point cloud three-dimensional coordinates of each small corrosion surface, and repeating the steps to obtain a three-dimensional coordinate database consisting of a large number of corrosion surfaces with different corrosion appearances.
(2) And establishing a random probability model by using a mathematical analysis tool, randomly extracting three-dimensional coordinates of corrosion samples in a database by using the random probability model, and rearranging and combining point clouds to form a new corrosion surface.
(3) And (3) extracting the two newly formed corrosion surfaces, carrying out grid division and hexahedron grid model establishment by using Hypermesh software according to the method, and then carrying out fatigue calculation on the corrosion model by combining ABAQUS software and Fe-safe software.
By the method of establishing a database and a random probability model, a large number of corrosion models with different corrosion appearances can be obtained. The new corrosion model is established on the basis of the original real corrosion model, the corrosion appearance of the surface of the new corrosion model has greater relevance to the corrosion condition of a real metal material, and the new corrosion model can be considered as a possible result of corrosion of a metal material test piece in a marine environment or a simulated marine environment. Therefore, under the condition of having a plurality of corrosion models, the corrosion amount and the corrosion morphology of the metal material can be quantitatively analyzed, and the influence of two parameters of the corrosion amount and the corrosion morphology on the fatigue performance of the metal material can be researched.
The amount of corrosion in the corrosion model can be measured and evaluated using an indicator of the volume loss rate of the model. And calculating the volume of the corrosion model by using a volume calculation tool carried by Geomagic Wrap software, and comparing the calculated volume with the volume before corrosion to obtain the ratio of the volume reduction of the test piece after corrosion to the volume of the test piece before corrosion, namely the volume loss rate caused by corrosion.
The erosion profile can be represented by two indicators, the average thickness and the minimum thickness of the model. The larger the difference between the average thickness and the minimum thickness of the model is, the more serious the corrosion unevenness degree of the surface of the metal material is, the larger the roughness is, and finally, when external fatigue load is applied, the expansion of fatigue cracks is promoted due to a larger stress concentration effect, so that the fatigue performance of the metal material is reduced. The average and minimum thicknesses of the corrosion model can be obtained using the Geomagic Wrap software and mathematical analysis tools.
Finally, fatigue calculation is carried out on the corrosion model through ABAQUS software and Fe-safe software, and the corrosion model with different volume loss rates and residual thicknesses can be obtainedS-NCurve line. In finite element fatigue analysis results and existing specificationsOn the basis, theoretical analysis is carried out, an internal relation formula among the volume loss rate, the residual thickness, the fatigue stress and the fatigue life can be obtained, not only can suggestions and guidance be provided for the fatigue performance of the metal material in the actual engineering under the marine environment, but also the residual fatigue life of the metal material under a certain volume loss rate and residual thickness can be predicted.
By adopting the technical scheme of the embodiment, limited resources can be utilized to the maximum extent, more corroded finite element models can be obtained, parameters such as corrosion amount and corrosion morphology of the finite element models are quantized, influence factors of fatigue performance of a metal material after corrosion are researched, formula deduction of fatigue strength is carried out on the basis of finite element analysis data and the existing design specifications, residual fatigue strength of the metal material in a corrosion environment is predicted, and guidance and suggestion are provided for fatigue performance of an actual metal material structure applied to a marine environment.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
1. A method for numerical simulation and parameter analysis of fatigue finite elements after corrosion of metal materials is characterized by comprising the following steps: the method comprises the following steps:
step S1, scanning the existing corroded metal material test piece to obtain a corroded three-dimensional digital model, and establishing a three-dimensional coordinate database of the corroded morphology;
step S2, establishing a random probability model, randomly selecting three-dimensional coordinate points, recombining point clouds, fitting a new corrosion surface, and establishing a new corrosion model;
step S3, extracting two corrosion surfaces of the obtained new corrosion model, carrying out grid division and hexahedron grid model establishment by using Hypermesh software, and then carrying out fatigue calculation on the corrosion model by combining ABAQUS software and Fe-safe software;
adopting Hypermesh software to divide grids, comprising the following steps:
opening a polygonal mesh model in reverse engineering software Geomagic Wrap, then repairing an initial scanning model by using a repairing function in the software, so that the model is formed by closed and continuous polygonal meshes, extracting upper and lower corrosion surfaces of a corrosion model, and then importing a stl format file with two corrosion planes into Hypermesh software, wherein the corrosion surfaces at the moment are formed by triangular meshes;
establishing two planes consisting of regular quadrilateral grids in the normal direction of the corrosion surface to cover but not exceed the original corrosion surface;
using a map to get function of a HyperMorph tool in Hypermesh software, wherein map to elements selects a regular quadrilateral mesh plane, map nodes selects an erosion surface formed by triangular meshes, a normal direction is selected in a mapping direction, the regular quadrilateral meshes are mapped onto the erosion surface, and finally two erosion surfaces formed by the regular quadrilateral meshes are obtained;
the method comprises the steps of connecting two quadrilateral mesh corrosion surfaces together by using a 'linear solid' function of a 3D tool in Hypermesh software to obtain a regular hexahedral mesh model, then introducing the obtained hexahedral mesh corrosion model into ABAQUS software, and defining the type of a mesh unit, the material property and the boundary condition, thereby establishing a complete finite element fatigue calculation corrosion model of the metal material corrosion test piece.
2. The method of finite element numerical simulation and parametric analysis of fatigue after corrosion of metallic material as claimed in claim 1, wherein step S1 comprises: and 3D scanning the corroded metal material test piece by using a 3D scanner to obtain a polygonal mesh model of the test piece, further converting to obtain a three-dimensional solid model, and then performing mesh division and fatigue simulation on the three-dimensional solid model by using a finite element analysis method.
3. The method of claim 2, wherein the method comprises the steps of: and meshing by adopting a tetrahedral mesh.
4. The method of claim 1, wherein the method comprises the steps of: the fatigue calculation of the corrosion model by the ABAQUS software and the Fe-safe software comprises the following steps:
introducing the corrosion model into ABAQUS software, applying static load, and performing static analysis to obtain a stress cloud picture of the corrosion model;
importing the stress cloud picture of the corrosion model into Fe-safe software in an odb format file, namely storing the node stress of the corrosion model into the Fe-safe software for fatigue analysis;
performing fatigue calculation on the corrosion model by adopting a stress-life method according to a Miner linear accumulation criterion and a rain flow counting method; inputting materials in Fe-safe softwareS-NAnd setting the fatigue load and stress ratio of the model, and obtaining the fatigue life of the final model by adopting a nominal stress method in combination with the stress concentration coefficient.
5. The method of finite element numerical simulation and parametric analysis of fatigue after corrosion of metallic material as claimed in claim 1, wherein step S1 comprises:
cutting the upper and lower corrosion surfaces of the obtained corrosion model by using Geomagic Wrap software to obtain a plurality of corrosion surface blocks, wherein each corrosion surface block has different corrosion appearances; taking out the corroded surface blocks as initial samples respectively, converting the corroded surface blocks into a point cloud model, exporting a file in an obj. format, and opening the file by using a notebook to obtain three-dimensional coordinates of the point cloud forming the corroded morphology; and storing the point cloud three-dimensional coordinates of each corrosion surface block, and repeating the steps to obtain a three-dimensional coordinate database consisting of the corrosion surface blocks with different corrosion appearances.
6. The method for fatigue finite element numerical simulation and parameter analysis after corrosion of metal material according to any one of claims 1 to 5, wherein: under the condition of having a plurality of corrosion models, the quantitative analysis is carried out on the corrosion amount and the corrosion appearance of the corrosion model, and the influence of two parameters of the corrosion amount and the corrosion appearance on the fatigue performance of the metal material is researched.
7. The method of claim 6, wherein the method comprises the steps of: and measuring and evaluating the corrosion amount of the corrosion model by adopting the volume loss rate of the model, calculating the volume of the corrosion model by using a volume calculation tool carried by Geomagic Wrap software, and comparing the volume with the volume before corrosion to obtain the ratio of the volume reduction of the test piece after corrosion to the volume of the test piece before corrosion, namely the volume loss rate caused by corrosion.
8. The method of claim 6, wherein the method comprises the steps of: the corrosion morphology is represented by two indexes, namely the average thickness and the minimum thickness of the corrosion model, and the average thickness and the minimum thickness of the corrosion model are obtained by using Geomagic Wrap software and a mathematical analysis tool.
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| CN111625985A (en) * | 2020-06-01 | 2020-09-04 | 中国人民解放军海军航空大学青岛校区 | Fatigue notch coefficient data processing method considering corrosion and residual stress |
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