CN108489820B - A kind of acquisition methods of high temperature tension test trus stress - Google Patents
A kind of acquisition methods of high temperature tension test trus stress Download PDFInfo
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- 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
- G01N3/18—Performing tests at high or low temperatures
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- 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
- G01N3/06—Special adaptations of indicating or recording means
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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
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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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
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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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
The present invention relates to a kind of acquisition methods of high temperature tension test trus stress, select the tensile sample in pole shape, measure the total length and cross-sectional diameter of sample；Sample with thermocouple is mounted on hot modeling test machine, is broken sample with the tensile speed V of setting, breaked fracture surface of sample is rounded；It is projected into plane, establish coordinate system, the form fit presented according to the curve of A and B point-to-point transmission, it is indicated using functional relation, obtain the variation relation of sample cross area with tensile elongation: and then obtain the corresponding sample cross area of moment t, sample institute stress value F when then finding out moment t finally obtains the trus stress curve that sample is subject to.Advantage is: by the variation of cross-sectional area of sample during drawing by high temperature effectively being obtained, to obtain accurate trus stress curve to the rounded tensile sample analysis of rear fracture is broken.
Description
Technical field
The invention belongs to thermo dynamic analogy experimental technique field more particularly to a kind of acquisition sides of high temperature tension test trus stress
Method.
Background technique
Based on high temperature tension test data research material at high temperature mechanical property and prediction of rolling force mainly using heating power
Simulation test machine and material mechanical test machine.Common testing equipment embeds force sensor, can directly acquire material whole
The force value that a test process is subject to, but equipment does not directly acquire material cross-sectional area situation of change during the test but
Ability.During the test, the parameters such as temperature, deflection, force value and the flow stress value of material can be obtained.In high temperature
One of important parameter is exactly stress value in tension test data, however, what equipment accurately collected can only be that sample is born
Load force value, it is difficult to obtain the cross-sectional area that sample changes with drawing process, and stress be load force value and sample at this moment
The ratio of cross-sectional area therefore be difficult to realize the precise measurement to stress value during drawing by high temperature by the prior art.
The prediction of rolling force of research material elevated temperature strength and material, one of method are obtained by the method for drawing by high temperature
It to material tensile test data, and based on this data, carries out regression fit and obtains stress-strain diagram, and consider deformation speed
The influence of rate and deformation temperature to flow stress needs to propose a kind of effective height to obtain high-precision draught pressure forecast value
Warm tension test trus stress acquisition methods.
Summary of the invention
In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a kind of acquisition sides of high temperature tension test trus stress
Method, by realizing to find out the changes of section trend of sample during stretching to breaked sample analysis and effectively obtaining material
The purpose of the trus stress of material during stretching.
To achieve the above object, the invention is realized by the following technical scheme:
A kind of acquisition methods of high temperature tension test trus stress, comprising the following steps:
1) tensile sample in pole shape is selected, the total length and cross-sectional diameter of sample is measured, is denoted as L, D respectively；
2) thermocouple is welded in the middle position of specimen length in step 1；
3) sample with thermocouple is mounted on hot modeling test machine, at a temperature of setting, with the stretching of setting
Speed V breaks sample, and breaked fracture surface of sample is rounded；The temperature of setting, thermocouple feedback temperature are acquired in the process
Degree stretches the displacement of force value and drawing process, sets data acquiring frequency as f；
4) the both ends fracture docking that will break rear sample, measures its total length L ' and fracture diameter d, obtains the elongation of sample
Measure Δ L=L'-L；
5) selecting step 3) in breaked one section of sample, be projected into plane, with this section of specimen length direction, i.e.,
The axis of sample is y-axis, starts the vertical line for making y-axis at reduction along the length direction width of this section of sample, where vertical line section
Straight line is that x-axis establishes rectangular coordinate system, is analyzed the contour line of this section of sample projection on coordinate system, contour line breaks
The coordinate of terminal A is at mouthfulThe coordinate of the positive intersection points B of contour line and x-axis isAccording to A and B
The form fit that the curve of point-to-point transmission is presented is indicated using functional relation (1), formula (2):
Y=ax2+c (1)
Y=ex4+f (2)
In formula (1), formula (2): a, c, e, f are undetermined coefficient；
The coordinate of A and B two o'clock is substituted into formula (1) or (2) respectively, obtains undetermined coefficient a, c, e and f, and then obtain
Corresponding function expression；
6) cross-sectional diameter of the sample of function declaration obtained in step 5) with tensile elongation changing rule, it is transversal
Face area S calculation formula are as follows:
S=π x2 (3)
By formula (1) or (2) and formula (3), the variation relation of sample cross area and tensile elongation is obtained:
7) t pairs of the moment is obtained by the formula (4) or formula (5) in step 6) according to the tensile speed V set in step 3)
The sample cross area answered, sample institute stress value F, the then trus stress that sample is subject to when then finding out moment t
Moment, t was calculated by following formula:
In formula (6), y is the sample amount of tension calculated in step 6)；
8) when finding out any time according to step 7, the cross-sectional area of stretching force value and its corresponding sample that sample is subject to
It can be obtained by the trus stress curve of sample during stretching.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is by effectively obtaining sample in drawing by high temperature process to the rounded tensile sample analysis of rear fracture is broken
In cross-sectional area variation, it is then this value is corresponding with the stretching force value that sample in drawing process is subject to, so that it may to obtain
Sample is by trus stress, to obtain accurate trus stress curve.
Detailed description of the invention
Fig. 1 is schematic diagram of the contour line in coordinate system.
In figure: the projection line of 1- contour line 2- fracture.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings of the specification, it should be noted that implementation of the invention is unlimited
In the following embodiments and the accompanying drawings.
A kind of acquisition methods of high temperature tension test trus stress, comprising the following steps:
1) tensile sample in pole shape is selected, the total length and cross-sectional diameter of sample is measured, is denoted as L, D respectively；
2) thermocouple is welded in the middle position of specimen length in step 1；
3) sample with thermocouple is mounted on hot modeling test machine, according to the temperature of setting, with the stretching speed of setting
Degree V breaks sample, and breaked fracture surface of sample section is rounded；The temperature of setting, thermocouple feedback are acquired in the process
Temperature stretches the displacement of force value and drawing process, sets data acquiring frequency as f；
4) the both ends fracture docking that will break rear sample, measures its total length L ' and fracture diameter d, obtains the elongation of sample
Measure Δ L=L'-L；
5) see Fig. 1, selecting step 3) in breaked one section of sample, be projected into plane, with this section of specimen length
Direction, the i.e. axis of sample are y-axis, start the vertical line for making y-axis at reduction, along the length direction width of this section of sample with vertical line
Straight line where section is that x-axis establishes rectangular coordinate system, is analyzed the contour line of this section of sample projection on coordinate system, profile
The coordinate of the incision position terminal A of line isThe coordinate of the positive intersection points B of contour line and x-axis is That is B point
Width starts the point at reduction on formula contour projection, according to the form fit that the curve of A and B point-to-point transmission is presented, using function
Relational expression (1), formula (2) indicate:
Y=ax2+c (1)
Y=ex4+f (2)
In formula (1), formula (2): a, c, e, f are undetermined coefficient；
The coordinate of A and B two o'clock is substituted into formula (1) or (2) respectively, obtains undetermined coefficient a, c, e and f, and then obtain
Corresponding function expression；
6) cross-sectional diameter of the sample of function declaration obtained in step 5) with tensile elongation changing rule, it is transversal
Face area S calculation formula are as follows:
S=π x2 (3)
By formula (1) or (2) and formula (3), the variation relation of sample cross area and tensile elongation is obtained:
7) t pairs of the moment is obtained by the formula (4) or formula (5) in step 6) according to the tensile speed V set in step 3)
The sample cross area answered, sample is suffered when then finding out moment t stretches force value F, then the trus stress that sample is subject to is
Moment, t was calculated by following formula:
In formula (6), y is the sample amount of tension calculated in step 6)；
8) when finding out any time according to step 7, the cross-sectional area of stretching force value and its corresponding sample that sample is subject to
It can be obtained by the trus stress curve of sample during stretching.
Embodiment:
The acquisition methods of high temperature tension test trus stress, comprising the following steps:
1) selecting specimen size to be tensioned is 10 × 120mm of Ф, it is known that the ingredient of the material of sample；
2) thermocouple is welded in the middle position of the specimen length in step 1)；
3) sample that thermocouple is welded is installed on hot modeling test machine, and clamping；Software is controlled in test procedure
Upper programming is broken sample with tensile speed 1mm/s with realizing at a temperature of 1000 DEG C；Testing acquisition parameter includes that program is set
Determine temperature, thermocouple feedback temperature, the displacement for stretching force value and drawing process, the data acquiring frequency set is 20Hz；
Start testing machine control program and carry out tension test, sample is broken, the breaked fracture section of sample is rounded；
4) the both ends fracture for breaking rear sample is docked, measuring its total length is 126mm and fracture diameter 4mm, is tried
The elongation Δ L=6mm of sample；
5) it is (2, -3) that step 5, which obtains A point coordinate in Fig. 1, and B point coordinate is (5,0), and the unit of two reference axis is milli
Rice, using formula (1), by A, B two o'clock coordinate is substituted into:
6) variation relation of sample cross area and tensile elongation is obtained are as follows:
By formula (6) and formula (8) simultaneous, it can determine that the corresponding sample cross area of moment t obtains:
7) corresponding relationship of the stretching force value and time collected according to testing machine, so that it may obtain stretching force value and examination
The corresponding relationship of sample cross-sectional area, by by the ratio of two parameters of synchronization, i.e. drawing force and sample cross face
Long-pending ratio, so that it may obtain the trus stress of moment sample receiving, and then obtain corresponding trus stress curve.
Claims (1)
1. a kind of acquisition methods of high temperature tension test trus stress, which comprises the following steps:
1) tensile sample in pole shape is selected, the total length and cross-sectional diameter of sample is measured, is denoted as L, D respectively；
2) thermocouple is welded in the middle position of specimen length in step 1；
3) sample with thermocouple is mounted on hot modeling test machine, at a temperature of setting, with the tensile speed V of setting
Sample is broken, breaked fracture surface of sample is rounded；The temperature of setting is acquired in the process, and thermocouple feedback temperature is drawn
The displacement of stretch value and drawing process sets data acquiring frequency as f；
4) the both ends fracture docking that will break rear sample, measures its total length L ' and fracture diameter d, obtains the elongation Δ of sample
L=L'-L；
5) selecting step 3) in breaked one section of sample, be projected into plane, with this section of specimen length direction, i.e. sample
Axis be y-axis, start the vertical line for making y-axis at reduction, along the length direction width of this section of sample with straight line where vertical line section
Rectangular coordinate system is established for x-axis, the contour line of this section of sample projection on coordinate system is analyzed, the incision position of contour line
The coordinate of terminal A isThe coordinate of the positive intersection points B of contour line and x-axis isAccording to A and B two o'clock
Between curve present form fit, using functional relation (1), formula (2) indicate:
Y=ax2+c (1)
Y=ex4+f (2)
In formula (1), formula (2): a, c, e, f are undetermined coefficient；
The coordinate of A and B two o'clock is substituted into formula (1) or (2) respectively, obtains undetermined coefficient a, c, e and f, and then has been obtained corresponding
Function expression；
6) changing rule of the cross-sectional diameter of the sample of function declaration obtained in step 5) with tensile elongation, cross section face
Product S calculation formula are as follows:
S=π x2 (3)
By formula (1) or (2) and formula (3), the variation relation of sample cross area and tensile elongation is obtained:
7) it is corresponding to be obtained by the formula (4) or formula (5) in step 6) according to the tensile speed V set in step 3) by moment t
Sample cross area, sample institute stress value F, the then trus stress that sample is subject to when then finding out moment t
Moment, t was calculated by following formula:
In formula (6), y is the sample amount of tension calculated in step 6)；
8) when finding out any time according to step 7, the cross-sectional area of stretching force value and its corresponding sample that sample is subject to can
To obtain the trus stress curve of sample during stretching.
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| CN110702727B (en) * | 2019-09-30 | 2022-02-18 | 鞍钢股份有限公司 | Method for measuring static recrystallization volume fraction of material |
| CN112927185A (en) * | 2021-01-19 | 2021-06-08 | 中国石油天然气集团有限公司 | True stress-true strain curve test calculation method based on digital image correlation method |
| CN113310437B (en) * | 2021-05-28 | 2023-05-16 | 广东韶钢松山股份有限公司 | Method and device for automatically measuring wire rod area shrinkage |
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