CN114152521B - Method and system for analyzing ductility index of metal material - Google Patents
Method and system for analyzing ductility index of metal material Download PDFInfo
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- 230000010354 integration Effects 0.000 claims description 34
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- 238000004364 calculation method Methods 0.000 claims description 5
- 238000009864 tensile test Methods 0.000 claims description 3
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- 238000005056 compaction Methods 0.000 claims 1
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- G—PHYSICS
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- 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
- G01N3/28—Investigating ductility, e.g. suitability of sheet metal for deep-drawing or spinning
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- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- 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
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- 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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- 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
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- 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
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- 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
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Abstract
In order to solve the technical problem that fracture restoration degree in a traditional measurement mode affects a measurement result of a ductility index of mechanical properties of a metal material, the embodiment of the invention provides a method and a system for analyzing the ductility index of the metal material, which comprise the following steps: obtaining engineering stress strain data of the metal material to be analyzed through a uniaxial tension experiment test; calculating the area surrounded by the engineering stress strain data to obtain a first area; calculating the area surrounded by data from the engineering stress strain starting point to the tightening critical point to obtain a second area; and calculating the ductility index gamma of the metal material to be analyzed according to the formula (1). According to the embodiment of the invention, the ductility index of the metal material is analyzed based on the strain energy, so that the influence of fracture restoration degree in the traditional measurement mode on the measurement result of the ductility index of the mechanical property of the metal material is avoided.
Description
Technical Field
The invention relates to a method and a system for analyzing ductility indexes of metal materials.
Background
At present, analysis and measurement of ductility indexes in mechanical properties of metal materials are often characterized by adopting section shrinkage and elongation indexes. However, the section shrinkage and elongation index are all required to be measured by a dimension measuring tool such as a vernier caliper or the like on a uniaxially stretched sample after the completion of the experiment (the sample has been pulled apart at this time), and then calculated based on the formulas of the section shrinkage and elongation.
Secondary length rate calculation formula:
Where l 1 is the length of the working segment after the break, and l is the initial length of the working segment, which is typically 5 times the sample diameter.
The calculation formula of the section shrinkage rate:
Wherein A 1 is the minimum cross-sectional area of the fracture of the sample working section after breaking, and A is the initial cross-sectional area of the sample working section. If the section of the sample working section is circular, calculating a section shrinkage rate formula:
Wherein D is the initial diameter of the working section of the sample, and D 1 is the minimum diameter of the fracture of the working section of the sample after stretch-breaking.
It should be noted that when the measurement is performed on the pulled monoaxially stretched sample by the size measuring tool, firstly, the pulled monoaxially stretched sample is subjected to fracture restoration, and then the data such as the minimum diameter of the net section of the fracture working section, the length of the working section after the fracture and the like are measured and obtained by the vernier caliper. From the above measurement process, it can be seen that the fracture restoration degree will directly affect the result of the measurement data. In actual measurement, human factors have a large influence on the restoration degree of the fracture, and human errors exist in the measurement data of the samples after the fracture, and the errors directly affect the measurement of the section shrinkage and elongation indexes.
In summary, in the analysis and measurement aspect of the ductility index of the mechanical property of the metal material, the reduction rate and the elongation rate of the section are greatly influenced by the fracture restoration degree, wherein the influence of human factors on the fracture restoration degree is large and not negligible.
Disclosure of Invention
In order to solve the technical problem that the fracture restoration degree of the traditional measurement mode affects the measurement result of the ductility index of the mechanical property of the metal material, the embodiment of the invention provides a method and a system for analyzing the ductility index of the metal material.
The embodiment of the invention is realized by the following technical scheme:
in a first aspect, an embodiment of the present invention provides a method for analyzing a ductility index of a metal material, including:
obtaining engineering stress strain data of the metal material to be analyzed through a uniaxial tension experiment test;
Calculating the area surrounded by the engineering stress strain data to obtain a first area;
Calculating the area surrounded by data from the engineering stress strain starting point to the tightening critical point to obtain a second area;
Calculating the ductility index gamma of the metal material to be analyzed according to the formula (1)
In a second aspect, an embodiment of the present invention provides a method for analyzing a ductility index of a metal material, including:
acquiring engineering stress strain data of a metal material to be analyzed;
acquiring tensile strength data of the metal material to be analyzed based on the engineering stress strain data;
performing numerical integration on the area surrounded by the engineering stress strain data to obtain a strain energy parameter SED DATA;
in the engineering stress strain data, numerical integration is carried out from the starting point data to the tensile strength data to obtain a tightening phenomenon critical parameter SED NECK;
calculating a ductility index gamma according to formula (2)
Further, the engineering stress strain data are obtained through uniaxial tensile test.
Further, the tensile strength data includes a tensile strength σ u and a tensile strain ε u; and in the engineering stress strain data, numerical integration is carried out from the starting point data to the tensile strength sigma u data, so as to obtain a tightening phenomenon critical parameter SED NECK.
Further, the numerical integration is performed on the area enclosed by the engineering stress strain data to obtain a strain energy parameter SED DATA; comprising the following steps:
And carrying out numerical integration on the area surrounded by the engineering stress strain data on an engineering stress strain-strain curve to obtain a strain energy parameter SED DATA.
Further, in the engineering stress strain data, numerical integration is performed from the starting point data to the tensile strength data to obtain a tightening phenomenon critical parameter SED NECK; comprising the following steps:
And integrating the starting point data in the engineering stress strain data to the tightening critical point data in the area enclosed by the engineering stress strain-strain curve to obtain a tightening phenomenon critical parameter SED NECK.
In a third aspect, an embodiment of the present invention provides a system for analyzing a ductility index of a metal material, including:
the first acquisition unit is used for acquiring engineering stress strain data of the metal material to be analyzed;
the second acquisition unit is used for acquiring the tensile strength data of the metal material to be analyzed based on the engineering stress strain data;
the first area integration unit is used for carrying out numerical integration on the area enclosed by the engineering stress strain data to obtain a strain energy parameter SED DATA;
the second area integration unit is used for carrying out numerical integration from the starting point data to the tensile strength data in the engineering stress strain data to obtain a tightening phenomenon critical parameter SED NECK;
a calculation unit for calculating the ductility index gamma according to the formula (2)
Further, the first area integration unit is configured to numerically integrate an area enclosed by the engineering stress strain data on an engineering stress strain-strain curve to obtain a strain energy parameter SED DATA;
The second area integration unit is configured to integrate the starting point data in the engineering stress strain data to the tightening critical point data, and the area enclosed on the engineering stress strain-strain curve to obtain a tightening phenomenon critical parameter SED NECK.
In a fourth aspect, an embodiment of the present invention provides an apparatus for analyzing a ductility index of a metal material, including a memory, a processor, and a transceiver, which are sequentially communicatively connected, where the memory is configured to store a computer program, the transceiver is configured to send and receive a message, and the processor is configured to read the computer program, and execute the method for analyzing a ductility index of a metal material.
Compared with the prior art, the embodiment of the invention has the following advantages and beneficial effects:
according to the method and the system for analyzing the ductility index of the metal material, provided by the embodiment of the invention, the ductility index of the metal material is analyzed based on the strain energy, so that the influence of fracture restoration degree in a traditional measurement mode on the measurement result of the ductility index of the mechanical property of the metal material is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for analyzing ductility index of a metal material.
FIG. 2 is a schematic diagram of a system for analyzing ductility index of a metal material.
Fig. 3 is a graph of engineering stress strain data, tensile strength σ u, and tensile strain ε u.
FIG. 4 is a graph of the area enclosed by engineering stress strain data.
FIG. 5 is a plot of the area enclosed by engineering stress strain from the onset point to the tensile strength data point.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known structures, materials, or methods have not been described in detail in order to avoid obscuring the present invention.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
Examples
In order to solve the technical problem that the fracture recovery degree of the traditional measurement method affects the measurement result of the ductility index of the mechanical property of the metal material, in a first aspect, an embodiment of the present invention provides a method for analyzing the ductility index of the metal material, as shown in fig. 1, including:
S1, obtaining engineering stress strain data of a metal material to be analyzed through a uniaxial tension experiment test;
S2, calculating the area surrounded by the engineering stress strain data to obtain a first area;
S3, calculating the area surrounded by data from the engineering stress strain starting point to the tightening critical point to obtain a second area;
S4, calculating the ductility index gamma of the metal material to be analyzed according to the formula (1)
Therefore, the embodiment of the invention avoids the influence of fracture restoration degree of the traditional measurement mode on the measurement result of the ductility index of the mechanical property of the metal material by analyzing the ductility index of the metal material based on strain energy.
Reference is made to fig. 3-5. The method of calculating and using the present invention is exemplified as follows:
The parameters that need to be known include: engineering stress strain data of the metal material.
In the example, taking engineering stress strain data of reactor pressure vessel steel (SA-5083) at room temperature as an example, the detailed implementation procedure is as follows:
Calculating to obtain an engineering stress strain enclosed area SED DATA = 170.7802MPa;
Calculating to obtain the area SED NECK = 60.2921MPa enclosed by the engineering stress strain from the starting point to the tensile strength data;
Calculating to obtain ductility index
In a second aspect, an embodiment of the present invention provides a method for analyzing a ductility index of a metal material, including:
acquiring engineering stress strain data of a metal material to be analyzed;
acquiring tensile strength data of the metal material to be analyzed based on the engineering stress strain data;
performing numerical integration on the area surrounded by the engineering stress strain data to obtain a strain energy parameter SED DATA;
in the engineering stress strain data, numerical integration is carried out from the starting point data to the tensile strength data to obtain a tightening phenomenon critical parameter SED NECK;
calculating a ductility index gamma according to formula (2)
Further, the engineering stress strain data are obtained through uniaxial tensile test.
Further, the tensile strength data includes a tensile strength σ u and a tensile strain ε u; and in the engineering stress strain data, numerical integration is carried out from the starting point data to the tensile strength sigma u data, so as to obtain a tightening phenomenon critical parameter SED NECK.
Further, the numerical integration is performed on the area enclosed by the engineering stress strain data to obtain a strain energy parameter SED DATA; comprising the following steps:
And carrying out numerical integration on the area surrounded by the engineering stress strain data on an engineering stress strain-strain curve to obtain a strain energy parameter SED DATA. Reference is made to fig. 4.
Further, in the engineering stress strain data, numerical integration is performed from the starting point data to the tensile strength data to obtain a tightening phenomenon critical parameter SED NECK; comprising the following steps:
And integrating the starting point data in the engineering stress strain data to the tightening critical point data in the area enclosed by the engineering stress strain-strain curve to obtain a tightening phenomenon critical parameter SED NECK. Reference is made to fig. 5.
In a third aspect, an embodiment of the present invention provides a system for analyzing ductility index of a metal material, as shown in fig. 2, including:
the first acquisition unit is used for acquiring engineering stress strain data of the metal material to be analyzed;
the second acquisition unit is used for acquiring the tensile strength data of the metal material to be analyzed based on the engineering stress strain data;
the first area integration unit is used for carrying out numerical integration on the area enclosed by the engineering stress strain data to obtain a strain energy parameter SED DATA;
the second area integration unit is used for carrying out numerical integration from the starting point data to the tensile strength data in the engineering stress strain data to obtain a tightening phenomenon critical parameter SED NECK;
a calculation unit for calculating the ductility index gamma according to the formula (2)
Further, the first area integration unit is configured to numerically integrate an area enclosed by the engineering stress strain data on an engineering stress strain-strain curve to obtain a strain energy parameter SED DATA;
The second area integration unit is configured to integrate the starting point data in the engineering stress strain data to the tightening critical point data, and the area enclosed on the engineering stress strain-strain curve to obtain a tightening phenomenon critical parameter SED NECK.
In a fourth aspect, an embodiment of the present invention provides an apparatus for analyzing a ductility index of a metal material, including a memory, a processor, and a transceiver, which are sequentially communicatively connected, where the memory is configured to store a computer program, the transceiver is configured to send and receive a message, and the processor is configured to read the computer program, and execute the method for analyzing a ductility index of a metal material.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A method of analyzing a ductility index of a metallic material, comprising:
obtaining engineering stress strain data of the metal material to be analyzed through a uniaxial tension experiment test;
Calculating the area surrounded by the engineering stress strain data to obtain a first area;
Calculating the area surrounded by data from the engineering stress strain starting point to the tightening critical point to obtain a second area;
Calculating the ductility index gamma of the metal material to be analyzed according to the formula (1)
2. A method of analyzing a ductility index of a metallic material, comprising:
acquiring engineering stress strain data of a metal material to be analyzed;
acquiring tensile strength data of the metal material to be analyzed based on the engineering stress strain data;
performing numerical integration on the area surrounded by the engineering stress strain data to obtain a strain energy parameter SED DATA;
in the engineering stress strain data, numerical integration is carried out from the starting point data to the tensile strength data to obtain a tightening phenomenon critical parameter SED NECK;
calculating a ductility index gamma according to formula (2)
3. The method of analyzing ductility index of metal material according to claim 2, wherein the engineering stress strain data is obtained by uniaxial tensile test.
4. The method of analyzing a ductility index of a metallic material as set forth in claim 2, wherein the tensile strength data comprises a tensile strength σ u and a tensile strain ε u; and in the engineering stress strain data, numerical integration is carried out from the starting point data to the tensile strength sigma u data, so as to obtain a tightening phenomenon critical parameter SED NECK.
5. The method of analyzing ductility index of metal material according to claim 2, wherein the area enclosed by the engineering stress strain data is numerically integrated to obtain strain energy parameter SED DATA; comprising the following steps:
And carrying out numerical integration on the area surrounded by the engineering stress strain data on an engineering stress strain-strain curve to obtain a strain energy parameter SED DATA.
6. The method of claim 2, wherein the engineering stress-strain data is numerically integrated from starting point data to the tensile strength data to obtain a compaction critical parameter SED NECK; comprising the following steps:
And integrating the starting point data in the engineering stress strain data to the tightening critical point data in the area enclosed by the engineering stress strain-strain curve to obtain a tightening phenomenon critical parameter SED NECK.
7. A system for analyzing a ductility index of a metallic material, comprising:
the first acquisition unit is used for acquiring engineering stress strain data of the metal material to be analyzed;
the second acquisition unit is used for acquiring the tensile strength data of the metal material to be analyzed based on the engineering stress strain data;
the first area integration unit is used for carrying out numerical integration on the area enclosed by the engineering stress strain data to obtain a strain energy parameter SED DATA;
the second area integration unit is used for carrying out numerical integration from the starting point data to the tensile strength data in the engineering stress strain data to obtain a tightening phenomenon critical parameter SED NECK;
a calculation unit for calculating the ductility index gamma according to the formula (2)
8. The system for analyzing ductility index of metal material of claim 7, wherein said first area integration unit is configured to numerically integrate an area enclosed by said engineering stress strain data on an engineering stress strain-strain curve to obtain a strain energy parameter SED DATA;
The second area integration unit is configured to integrate the starting point data in the engineering stress strain data to the tightening critical point data, and the area enclosed on the engineering stress strain-strain curve to obtain a tightening phenomenon critical parameter SED NECK.
9. A system for analysing a ductility index of a metallic material, comprising a memory, a processor and a transceiver in communication in sequence, wherein the memory is adapted to store a computer program, the transceiver is adapted to receive and send messages, and the processor is adapted to read the computer program and to perform a method of analysing a ductility index of a metallic material according to claim 1 or any one of claims 2 to 6.
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| WO2021037036A1 (en) * | 2019-08-28 | 2021-03-04 | 肖锋 | Test and calculation method for measuring real stress-strain curve of material |
| CN113673030A (en) * | 2021-08-05 | 2021-11-19 | 河钢股份有限公司 | Simulation analysis method for ductile fracture coupling failure of metal material |
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| US7308387B1 (en) * | 2003-09-23 | 2007-12-11 | Livermore Software Technology Corp. | Method and system for numerically simulating foam-like material in finite element analysis |
| CN108896562A (en) * | 2018-07-12 | 2018-11-27 | 广西大学 | Material residue lifetime estimation method based on the analysis of surface microstructure characteristic image |
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